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Phy12 Dynamics Quest 2022 v.A Multiple Choice - Identify the choice that best completes the statement or answers the question. [1 mark each - Knowledge B 1. An object sits at rest on a ramp. Which of the following free-body diagrams best represents the forces acting on the object? A А B с D E F F, F. y F EN F F B F 8. А b. B c. d. D E А. a. 2. With respect to Newton's third law, the action and reaction forces being equal, imply a "balanced" force situation b. act on different objects c. are equal provided the object is at rest d. are equal provided the object is moving with uniform motion e. are equal provided the object is NOT at rest or moving with uniform motion a. c. e. Tal > ball = | 3. Two masses hang on opposite ends of a rope suspended over a pulley. The pulley is restrained from rotating and the two forces: PTA (the force of tension exerted by the rope on mass A) and PTB (the force of tension exerted by the rope on mass B) are found to be тв equal in magnitude. If the pulley becomes free to rotate and the system begins moving the relationship between those forces becomes b. F Al | Fond FA SP. | 27 An object sits at rest on a ramp. As the angle of inclination of the ramp increases, the object suddenly begins to slide. Which of the following explanations best accounts for the object's movement? The coefficient of static friction has decreased sufficiently. The force of gravity acting on the object has increased sufficiently. c. The component of gravity along the ramp has increased sufficiently. d. The friction has decreased sufficiently while the normal force has remained unchanged. The normal force has increased sufficiently. 4. a. b. c d e. 5. Which of the following would be considered an inertial frame of reference? a. a moving escalator b. a car moving through a turn at a constant speed c. an object in "free fall d. a car pulling away as a traffic light tums green all of the above C. 6. a What effect does increasing the angle of an inclined plane have on the component of the force related to gravity? The component parallel to the plane increases, and the perpendicular component decreases. b. The component parallel to the plane decreases, and the perpendicular component increases. c. Both components incrcase. d. Both components decreasc. Both components remain the same, regardless of the angle. 7. A stone is tied to the end of a string and twirled around in a circle which describes a vertical plano. Which of the following free-body diagrams best represents the forces acting on the stone at the top of the circle? A FT FT C D E FN c. E B FA FA Y FFT 15 FE FC Fg e. E d. D b. B ... c c A . 4