Physics 20 AB03

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University of Alberta *

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Apr 3, 2024

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FOR STUDENT USE ONLY (If label is missing or incorrect) Student’s Questions and Comments Name Address City/Town Province Postal Code Apply Assignment Label Here Please use the correct preprinted label for this course and Assignment Booklet. Teacher’s Comments FOR ADLC USE ONLY Assigned to Marked by Mark: % Date Received: File Number: Summary Teacher’s Signature ALBERTA DISTANCE LEARNING CENTRE Physics 20 SCN2797 Assignment Booklet 3 Total Possible Marks Your Marks Lesson 1 15 Lesson 2 17 Lesson 3 15 Lesson 4 11 Lesson 5 56 TOTAL 114 REVISED September 2017
CANADIAN CATALOGUING IN PUBLICATION DATA Alberta Distance Learning Centre has an Internet site: http://www.adlc.ca The Internet can be a valuable source of information. However, because publishing to the Internet is neither controlled nor censored, some content may be inaccurate or inappropriate. Students are encouraged to evaluate websites for validity and to consult multiple sources. SCN2797 Physics 20 Assignment Booklet 3 ISBN: 978-1-927090-46-6 Copyright © 2009 Alberta Distance Learning Centre, a subsidiary of The Board of Trustees of Pembina Hills Regional Division No. 7. All rights reserved. 4601 - 63 Avenue Barrhead, Alberta, Canada T7N 1P4 Alberta Distance Learning Centre acknowledges with gratitude the contribution of Distributed Learning Branch in the preparation of these materials. All rights reserved. No part of this courseware may be reproduced, stored in a retrieval system, or transmitted in any form or by any means — electronic, mechanical, photocopying, recording, or otherwise — without written permission from Alberta Distance Learning Centre. Printed in Canada. Alberta Distance Learning Centre has made every effort to acknowledge original sources and to comply with copyright law. If errors or omissions are noted, please contact Alberta Distance Learning Centre so that necessary amendments can be made. For Users of Alberta Distance Learning Centre Courseware Much time and effort is involved in preparing learning materials and activities that meet curricular expectations as determined by Alberta Education. We ask that you respect our work by honouring copyright regulations. INTERNET
EFFECTS OF FORCE ON VELOCITY ASSIGNMENT BOOKLET 3 Unit B: Module 1 Physics 20
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Instructions for Submitting Assignments by mail: 1. Submit Assignments regularly for correction. 2. Submit only one Assignment at a time. This allows your marker to provide helpful comments that you can apply to subsequent course work. 3. Check the following before submitting each Assignment: • Are all lesson assignments complete? • Has all your work been checked using answers provided in the textbook to ensure understanding? • Have you attempted at least one more time those questions that you did not get correct? • Have you asked for help when you were "stuck"? 4. Place this Assignment Booklet in the submission envelope provided and mail it to or drop it at one of the ADLC offices listed below. Our Pledge to Students Alberta Distance Learning Centre is committed to helping students achieve their educational goals. We look forward to assisting students who are sincere in their desire to learn. Students may contact their course teacher(s) by phone, e-mail, fax, skype, or in person at an Alberta Distance Learning Centre office. Barrhead Calgary 4601 - 63 Avenue 341 - 58 Avenue SE Barrhead, Alberta T7N 1P4 Calgary, Alberta T2H 0P3 Phone 780-674-5333 Phone 403-290-0977 Toll-free 1-866-774-5333 Toll-free 1-866-774-5333, ext. 6200 Fax 1-866-674-6977 Fax 403-290-0978 Edmonton Lethbridge 300 HSBC Building Professional Building 10055 - 106 Street 712–4 th Avenue South Edmonton, Alberta T5J 2Y2 Lethbridge, Alberta T1J 0N8 Phone 780-452-4655 Phone 403-327-2160 Toll-free 1-866-774-5333, ext. 6100 Toll-free 1-866-774-5333, ext. 6300 Fax 780-427-3850 Fax 403-327-2710
Instructions for Submitting Assignments Electronically: If you choose to submit the lessons electronically, you must scan the completed lesson assignment; then, upload your assignment to your marker’s dropbox for grading. 1. Scan your completed assignment into PDF form. 2. Save the file to your computer using your full name and assignment number. If your name is Chris Smith and you completed Assignment 1, your file name should be Smith_Chris_A1.PDF. 3. Go to www.adlc.ca and log into SIS. You must login using your ADLC username and password. 4. Select “Physics 20” from your list of courses. 5. Select the “Content” then “Table of Contents” from the top of the screen, and scroll down to the assignment you are submitting. 6. Select the “Add Submission” button then the icon with a paper and plus sign; then, select “browse” from the pop-up window. Select your assignment file and then the “upload” button. 7. Select the “Submit” button to submit your assignment to your marker. Your marked assignments will be returned to you electronically through your dropbox. ©Thinkstock Avoid plagiarism by acknowledging all sources you use. Contact your teacher if you are uncertain how to document sources. Although you are encouraged to collaborate and discuss various aspects of this course with others, all submitted work must be your own.
Physics 20 Assignment Booklet 3 Assessment Successful completion of this course requires you to do the following: 1. Complete all sections in each Assignment Booklet to the best of your ability. Incomplete Assignment Booklets will be returned unmarked. 2. Achieve at least 40% on the final exam. In accordance with Alberta Distance Learning Centre policy, the final exam is worth 40% of the final course mark. 3. Achieve a final course mark of at least 50%. Process • Read the course material before working on the activities in this Assignment Booklet. The Physics 20 Student Module Books contain the information necessary for successful completion of your work. • Proceed carefully through each assignment. Reflect upon your answers and prepare your written responses to communicate your thoughts effectively. Time spent in planning results in better writing. • Proofread your work before submitting it for marking. Check for content, organization, paragraph construction (if applicable), grammar, spelling, and punctuation. • If you encounter difficulties or have any questions , contact your course teacher at Alberta Distance Learning Centre for assistance. Format If you choose to use a word processor for your written work, • format your work using an easy-to-read 12-point serif font such as Times New Roman • include your full name and student file number as a document header • double-space your final copy • staple your printed work to this Assignment Booklet
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 1 Lesson 1 Newton’s First and Second Laws of Motion Lesson 1 is worth 15 marks. The value of each question is circled in the left margin. Show all your work. 1. Using the “if-then” format of hypothesis writing, write hypotheses relating acceleration to a. net force b. mass 2. Apply Newton’s first law and the concept of inertia when answering 2a and 2b. a. How could you remove the placemat without moving the plate? ©Thinkstock 1 1 1 Value 15
Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 2 ADLC Physics 20 b. While moving at a constant speed over a flat field, a snowmobile rider tosses a rubber ball directly upward as shown below. If the rider moves at a constant velocity, the ball will return to her. Explain why. ©ADLC + y + x v b x v s v b y 3. When a head-on collision occurs between two cars, occupants who do not wear their seat belts may be “thrown forward”. Instead of saying “thrown forward”, how can you better explain Newton’s first law of motion? 2 2
Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 3 4. A vehicle is involved in a collision that produces a −1500 N net force. What is the acceleration of the 75.5 kg passenger in the car? Show your work. 5. An unbalanced force of +55.2 N causes a hockey puck to accelerate across some ice with an acceleration of +100 m/s 2 . What is the mass of the puck? Show your work. 2 2
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 4 ADLC Physics 20 6. A plane with a mass of 4.50 × 10 3 kg accelerates on takeoff at 10.0 m/s 2 . What is the net force acting on the plane? Show your work. 7. A 3500 kg car can accelerate at 18.0 m/s 2 . A motorcycle engine can produce 9000 N of force at maximum power output. If the motorcycle has a mass of 565 kg, can it accelerate faster than the car? Show your work. After you have completed all questions in Lesson 1, please place this booklet in a safe space until the end of Lesson 2. 2 2
Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 5 Lesson 2 Newton’s Third Law Lesson 2 of this assignment is worth 17 marks. The value of each question is circled in the left margin. Show all your work. 1. Two basketball players collide. Player 1, with a mass of 55.0 kg, experiences a −15.6 m/s 2 acceleration. If player 2 has a mass of 48.5 kg, what acceleration did he experience immediately following the collision? Show your work. (Hint: and F F F ma A on B B on A net =- = ) 2. Complete the following table. The first row has been completed as an example. Action Action Force Reaction Force A bullet is fired from a gun by the expanding gases. Expanding gases pushing on the bullet. Bullet pushing back on the expanding gases. A volleyball is served. Player’s hands exerting a forward force on the ball. The Moon orbits Earth. Moonward pull of the Moon acting on Earth. A fire fighter opens the fire hose, and water sprays forward. A sprinter’s shoe hits the ground. Value 17 2 6
Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 6 ADLC Physics 20 3. The following four questions (3a to 3d) refer to a child on a frictionless ice surface. The child is carrying a backpack with books in it. a. If the child uses action-reaction forces to move across a frictionless ice surface, explain where the forces originate. b. Draw a Free Body Diagram showing the action reaction pair. c. How could the child minimize the time required to get off the ice? d. Compare and contrast the child’s strategy for getting off the ice with the operating principles of a rocket engine. In your response, indicate what a rocket engine expels that serves a similar purpose to the backpack used in the child’s strategy. After you have completed all questions in Lesson 2, please place this booklet in a safe space until the end of Lesson 3. 2 2 2 3
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 7 Lesson 3 Normal Force and Friction Lesson 3 of this assignment is worth 15 marks. The value of each question is circled in the left margin. Show all your work. 1. A force scale is attached to a stack of books lying on a flat table. a. What happens to the size of the static frictional force as you begin to pull on the force scale? b. What happens to the stack of books if the applied force exceeds the maximum static frictional force? c. What is the minimum size for the static frictional force, and under what conditions will the minimum static frictional force be observed? d. What type of friction acts when the books are at rest but a force is exerted? 2. The coefficient of static friction between a book and the level surface it slides on is 0.65. If the mass of the book is 2.0 kg, what minimum initial applied force is required to slide the books across the surface? Show your work. Value 15 1 1 1 1 2
Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 8 ADLC Physics 20 3. An engine provides 5.0 kN of force to keep a 1600 kg vehicle moving at a uniform speed. (Air resistance is negligible.) What is the coefficient of static friction between the tires and the road surface? Show your work. 4. The amount of friction between train wheels and the track is based on the normal force and the coefficient of friction between the dry steel of the wheel and the dry steel of the track. If the train has a mass of 188 000 kg and the coefficient of friction on dry steel is 0.41 (static) and 0.38 (kinetic), what is the amount of static and kinetic friction force available to the wheels? Show your work. 2 4
Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 9 5. A 2.6 kg sled is pulled along a horizontal surface at a constant velocity to the south. If the coefficient of friction between the surfaces is 0.17, determine the force of friction acting on the sled. Show all work. After you have completed all questions in Lesson 3, please place this booklet in a safe space until the end of Lesson 4. 3
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 10 ADLC Physics 20 Lesson 4 Free-Body Diagrams and Net Force Lesson 4 of this assignment is worth 11 marks. The value of each question is circled in the left margin. Show all your work. 1. John and Barry are pulling on a fence post with ropes while their friend Pat uses a chain-saw to shear it at ground-level. John applies a force of . N 75 0 40 c 6 @ on one rope while Barry applies a force of . N 85 0 340 c 6 @ on the other rope. What is the net force on the post? Show your work. Value 11 6
Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 11 2. A team of 10 sled-dogs is pulling a loaded sled having a total mass of 1000 kg. The sled is moving at a constant velocity of 8.1 km/h over frozen tundra. a. Calculate the coefficient of friction between the sled and the snow if the dogs must exert a total force of 922 N to keep the sled travelling at the constant velocity. Show all work. _______ b. Which free-body diagram represents the sled-dog combination above? A. B. C. D. After you have completed all questions in Lesson 4, please place this booklet in a safe space until the end of Lesson 5. 4 1
Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 12 ADLC Physics 20 Lesson 5 Solving Net Force Problems Lesson 5 of this assignment is worth 56 marks. The value of each question is circled in the left margin. Show all your work. 1. A crate of bananas with a mass of 25.0 kg is dragged across a level floor by an applied force of +150 N [E] against a frictional force of 50.0 N [W]. What is the observed acceleration of the crate? Show your work. 2. A milk carton with a mass of 2.00 kg is pulled across a table with a horizontal force of 3.00 N. If the coefficient of friction is 0.110, what is the acceleration of the milk carton? Show your work. Value 56 2 3
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 13 3. A box of cereal is pushed with an applied force of 2.4 N [W] across a table. The cereal box has a mass of 2.5 kg and the box accelerates at 0.41 m/s 2 [W]. a. Draw a Free Body Diagram for this situation. b. Determine the force of friction. Show your work. c. Determine the coefficient of friction. Show your work. 1 2 2
Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 14 ADLC Physics 20 4. A 10.0 kg crate slides down a frictionless surface inclined at . 30 0 c relative to the horizontal. a. Draw a Free Body Diagram for this situation. b. Determine the magnitude of the parallel component of the crate’s weight. Show your work. c. Determine the magnitude of the perpendicular component of the crate’s weight. Show your work. 1 2 2
Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 15 5. A 12.0 kg object is on a surface that is inclined 30 c and the coefficient of friction is 0.65. a. Draw a Free Body Diagram showing the forces acting on this object. b. Determine the maximum force of static friction. Show your work. 1 2
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 16 ADLC Physics 20 6. A 34.0 kg block accelerates along a frictionless ramp that is inclined at 35 c . a. Draw a Free Body Diagram showing the forces acting on the block. b. Determine the acceleration of the block. Show your work. 1 3
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 17 7. A 10.0 kg box is placed on a ramp that is inclined at . 30 0 c to the horizontal. a. Draw a Free Body Diagram showing the forces acting on the block. b. Determine the force of friction required to keep the block stationary. Show your work. c. Determine the minimum coefficient of friction required to keep the box stationary. Show your work. 1 2 2
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 18 ADLC Physics 20 8. A construction worker is pulling a 15.0 kg crate up a . 50 0 c frictionless incline. She applies a force parallel to the incline and causes the crate to accelerate upwards at 3.00 m/s 2 . a. Draw a Free Body Diagram showing the forces on the crate. b. Determine the force that the construction worker must pull the crate with. Show your work. 1 3
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 19 9. A 20.0 kg box is placed on an inclined plane that makes an angle of . 20 0 c to the horizontal. a. Draw a Free Body Diagram showing the forces acting on the crate. b. Determine the coefficient of static friction. Show your work. 1 2
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 20 ADLC Physics 20 10. The diagram below shows a simple Pulley system. • . m 5 0 kg 1 = • . m 3 0 kg 2 = ©ADLC 1 2 Block One Block Two a. Draw a Free Body Diagram for each block. b. Determine the acceleration of the pulley system. Show your work. 1 3
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 21 c. Determine the tension in string. Show your work. 11. Using the definitions of normal force and apparent weight, complete the following calculations and explanations. a. Calculate the weight of a 60.0 kg person on Earth’s surface. Show your work. b. Suppose you jumped onto a bathroom scale. The scale initially indicates a high weight and then settles down to your actual weight. Is this statement true or false? Explain. 2 1 2
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Assignment Booklet 3 Unit B Module 1: Effects of Force on Velocity 22 ADLC Physics 20 12. The apparent weight of a passenger in an elevator equals the magnitude of the normal force acting on the passenger. Choose from the terms greater than , less than , or equal to when filling in the blanks in the next three sentences. a. The passenger’s weight when the elevator is at rest is _____ the apparent weight when the elevator accelerates upward. b. The passenger’s weight when the elevator is at rest is _____ the apparent weight when the elevator coasts. c. As an elevator goes up, it begins to slow down. The passenger’s apparent weight in this situation is ________ the passenger’s weight when the elevator is at rest. 13. Calculate the apparent weight of an 80.0 kg person riding in an elevator that is accelerating upward at a rate of 5.00 m/s 2 . Show your work. 14. What is the apparent weight of a person in free fall? Show your work. 1 1 1 2 2
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Unit B Module 1: Effects of Force on Velocity Assignment Booklet 3 ADLC Physics 20 23 15. If you are in an elevator that is accelerating upwards at 6.00 m/s 2 and your apparent weight is 800 N, what is your mass? Show your work. 16. A passenger on an elevator experiences an apparent weight of 500 N while accelerating downward. If the mass of the passenger is 70.0 kg, calculate the acceleration. Show your work. 17. While travelling down in an elevator at a constant speed, a passenger has a weight of 800 N. During the acceleration to stop at the ground floor, the passenger experiences an apparent weight of 1000 N. Calculate the acceleration of the elevator. Show your work. End of Assignment Booklet 3 After you have completed all questions in this assignment, submit this assignment booklet to your marker. For detailed instructions, please see the beginning of this booklet. 2 2 2
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Alberta Distance Learning Centre Box 4000 4601 – 63 Avenue Barrhead, Alberta T7N 1P4 adlc.ca 1-866-774-5333 info@adlc.ca Revised September 2017
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