Quiz_ Reading_ Particle Kinetics, Force and Acceleration

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Liberty University *

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Mechanical Engineering

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Apr 3, 2024

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3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 1/6 Quiz: Reading: Particle Kinetics, Force and Acceleration Due Feb 12 at 11:59pm Points 14 Questions 14 Available Feb 1 at 12am - May 3 at 11:59pm Time Limit 45 Minutes Instructions Attempt History Attempt Time Score LATEST Attempt 1 32 minutes 14 out of 14 Correct answers are hidden. Score for this quiz: 14 out of 14 Submitted Feb 8 at 1:51pm This attempt took 32 minutes. Question 1 1 / 1 pts parallel to the tangent of the path perpendicular to the tangent of the path directed towards the center of curvature of the path directed away from the center of curvature of the path The quiz: Covers the Textbook material from Module 3 – Module 4 (Chapter 13) . Contains 14 multiple-choice and true/false questions. Is limited to 35 minutes . Allows 1 attempt . Is worth 14 points . In cylindrical coordinates, the normal force N which the path exerts on the particle is always __________________________. Online Residential Athletics Sign In Request Info Apply Now Visit Us Create Guest Account
3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 2/6 Question 2 1 / 1 pts a) It deals with the relationship between force acted on the body and the change of motion caused by the force. b) It is based on the Newton's second law of motion c) It deals with the motion of the object without regarding the cause of the motion. d) a and c are not correct Question 3 1 / 1 pts a) the sum of forces acting on that object will not be zero. b) the object will start accelerating. c) the object will start moving opposite to the direction of the unbalanced force. d) the force will cause change in the velocity of the object. e) all except c can be answers. f) all phrases (a-d) can be answers. Question 4 1 / 1 pts force and acceleration relation. equation of motion. the equation of mass and acceleration. Newton's ±rst law of motion equation. Question 5 1 / 1 pts 1 N 9.81 N Which of the following statement(s) is/are not correct about kinetics? If there is an unbalanced force acting on an object, ______________________. According to your textbook the equation, F = m a is referred as ___________________________. According to Newton's law of gravitational attraction, the force of attraction developed between an object of mass 1 kg that is located at or near the surface of the earth is equal to __________.
3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 3/6 32.2 N Can't be determined if we don't know the mass of the earth Question 6 1 / 1 pts ±gure a) ±gure b) ±gure c) None of them Question 7 1 / 1 pts True False Yes, The force summation does not include the external forces. Internal forces are equal and opposite and don't affect the force summation. Question 8 1 / 1 pts sum of each particle’s acceleration the acceleration of the center of mass of the system (which contains the particles) Figure (a) shows an object of mass m subjected by several forces. Which one of these ±gures is called the kinetic diagram? When applying Newton's second law of motion ( Σ F = m a ), both internal and externally applied forces are included in the force summation. When applying the equation of motion for a system of n-particles, we write as Σ F = Σ m a = m a The term a is called _____________________. i i i G. G
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3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 4/6 the acceleration of the largest particle the acceleration of the smallest particle a represents the acceleration of the center of mass of the system of the particles Question 9 1 / 1 pts a) b) c) d) Question 10 1 / 1 pts tangent to the path away from the path's center of curvature towards the paths center of curvature G If two forces F and F act on an object of mass m to accelerate the object to the -x direction, which of the following ±gures represent the correct FBD? 1 2 When writing the equation of motion in the normal and tangential coordinate system, the normal component of the equation of motion is written as Σ F = m a . The direction of the a is always _______________. n n n
3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 5/6 opposite to the direction of motion The normal acceleration is always acts in the positive n-direction or towards the path's center of curvature. Question 11 1 / 1 pts True False This statement is false as friction acts opposite to the direction of motion. Question 12 1 / 1 pts 23.5 m/s and downward 40.5 m/s and downward 30.2 m/s and upward 20.3 m/s and downward Question 13 1 / 1 pts In dynamics, if there is a friction force acting on an object that in motion, it is always acting in the direction of the motion. If the block is pulled by a 200 N force, the magnitude and direction of the acceleration of the block are ___________. 2 2 2 2
3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics, Force and Acceleration: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671303?module_item_id=60442870 6/6 a = -1 i + 5 j m/s a = -6 i + 2 j m/s a = -5.01 j m/s a = 6 j m/s Question 14 1 / 1 pts an accelerated force main force centripetal force centrifugal force This force is called centripetal force and it acts towards the path's center. Quiz Score: 14 out of 14 If two forces, F = (3 i - 5 j ) N and F = (-4 i + 10 j ) N act on a 1kg particle, what will be the acceleration of the particle? 1 2 2 2 2 2 When writing the equation of motion in the normal and tangential coordinate system, the normal component of the equation of motion is written as Σ F = m a . The term Σ Fn is referred to as _______________. n n
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