SPH3U Lesson Assignment 6 (docx)

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Dec 6, 2023

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SPH3U Lesson 6 Assignment In this assignment you are going to focus on: Gravitational Forces Total Marks: 47 marks Instructions: After completing the lesson action section of your home page, you are ready to complete your lesson assignment. Follow these steps. a) In the textbox given, explain the strategy that you used to determine your answer. b) Fill in your answer. The mark for each question is given at the introduction to the questions to be completed. c) When finished answering all your questions, save your file and upload the file into the appropriate dropbox. Part A (Using the Concepts): Multiple Choice: ( 28 marks) Each question is worth different marks according to the strategy used. If calculations are required, the mark for the strategy will worth more marks and the final answer will be worth one mark. Identify the choice that best completes the statement or answers the question. Your choices are given below the text box. Make sure you include your strategy. __C__ 1. (two marks) Which of the following forces balances gravity for falling objects? a. tension b. electromagnetic force c. air resistance d. strong force __B__ 2. (two marks) Which of the following will experience the largest amount of air resistance? a. a piece of paper rolled into a tube b. a crumpled piece of paper c. a piece of paper folded into a thin sliver d. the broad side of a flat piece of paper SPH3U1 Lesson Assignment Page 1

___C_ 3. (three marks) A 0.500 kg mass gives a reading of 4.91 N when held by a spring scale. What is the gravitational field strength at this location? a. 5.07 b. 4.81 c. 4.91 d. 5.02 __B__ 4. (three marks) The gravitational field strength on top of Mount Everest is 9.7647 N/kg. What is the weight of a 0.750 00 kg mass there? a. 7.3235 N b. 7.2332 N c. 7.0335 N d. 7.1245 N __C__ 5. (two marks) On average, what is the gravitational field strength on the surface of Earth? a. 9.8 N/m 2 [up] b. 9.8 N/kg [down] c. 9.8 N/kg [up] d. 9.8 N/m 2 [down] ___A_ 6. (two marks) Which of the following is a measure of the force of gravity acting on an object? a. weight b. mass c. inertia d. volume _C___ 7. (two marks) Which of the following will change the mass of an object? SPH3U1 Lesson Assignment Page 2

a. placing the object in a vacuum b. changing the location c. changing the gravitational field strength d. none of the above __B__ 8. (two marks) Which of the following will change the weight of an object? a. increasing the objects mass b. increasing the gravitational field strength c. decreasing the objects mass d. all of the above __B__ 9. (two marks) Which of the following is correctly measured with a balance? a. density b. weight c. mass d. volume __A__10. (three marks) If a person has a mass of 60 kg on Earth, what would be their mass on the Moon? a. 60 kg b. 30 kg c. 115 kg d. 90 kg _D___11. (three marks) A 15 kg box sits on top of a 24 kg box in the middle of an elevator. Calculate the normal force acting on the bottom box from the floor when the elevator is accelerating downward at a rate of 2.2 m/s 2 . a. 2.2 N b. 3.8 N SPH3U1 Lesson Assignment Page 3

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c. 3.0 N d. 4.7 N SPH3U1 Lesson Assignment Page 4

_D___12. (two marks) What fraction is the strength of the Moon’s gravitational field compared to Earth’s? a. b. c. d. Part B: (The Concepts): True/False (12 marks): Answer each question given below by answering if the question is true or false. In the textbox given, include your explanation for your choice. Each question is worth two marks: one mark for the explanation and one mark for the correct answer. Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. __F__ 1. Resultant velocity is the maximum constant speed reached by a falling object. ___T_ 2. Opening a parachute slows down a skydiver by decreasing the gravitational field . __T__ 3. As an object moves away from the surface of Earth, the gravitational field strength decreases . __F__ 4. Gravitational field strength is a scalar . ___T_ 5. The gravitational field strength of Earth is weaker at the poles than it is at the equator. __T__ 6. Weight is a scalar . SPH3U1 Lesson Assignment Page 5

Part C (Putting the Concepts to Work): Completion ( 7 marks): Using your reading, answer the following questions. Give your answer as well as your strategy for determining your answer. As part of your answer, give the page number in the reference material or the website that you used to find the answer to the question. 1. (three marks) In your own words explain the difference between mass and weight. Why do the two terms get confused in everyday language? Mass and weight are two different but related concepts. Mass is a fundamental property of an object, representing the amount of matter it contains. It is measured in kilograms and remains constant regardless of where the object is located in the universe. On the other hand, weight is a force that results from the action of gravity on a mass. It is measured in newtons and can change depending on the gravitational field where the object is located. 2. (four marks) Create a table that compares mass and weight. Include the definition, symbol, SI unit, method of measuring and whether or not it varies with location. Attached the table file. SPH3U1 Lesson Assignment Page 6

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