1. (K) A net force acts on an object. The object will likely: a. move at constant speed b. remain stationary c. accelerate d. move at constant velocity 2. (K) In Newton's Third Law, the action and reaction forces a. are only equal if the object is moving with constant velocity. b. are only equal if the object is stationary. c. act on the same object. d. act on different objects. 3. (K) A vector is different from a scalar because a. a vector has a number and a unit whereas a scalar has a number only. b. a vector has direction whereas a scalar does not have direction. c. a vector has mass whereas a scalar does not have mass. d. a vector measures speed whereas a scalar measures velocity. 4. (T) Which of the following statements about motion graphs is incorrect? a. The slope of a position-time graph gives velocity. b. The slope of a velocity-time graph gives acceleration. c. The area under a velocity-time graph gives displacement. d. The area under a position-time graph gives velocity. 5. (T) Robert left home and went for a jog. He jogged 2.0 km [N], then 3.0 km [S] followed by 4.0 km [N]. What is Robert's final position from home? a. 0.0 km b. 3.0 km [N] c. 9.0 km [N] d. 3.0 km [S] 6. (K) If a box has a weight of 1000 N, its mass is: a. 1000 kg b. 102 kg c. 9800 kg d. 1000 kg [down] 7. (K) A 30 kg box is lifted from the ground to a height of 1.5 m. The work done is: a. 441 J b. 45 J C. 20 J d. 4.6 J 8. (A) If the amount of friction present in a moving machine decreases, a. the energy lost to heat decreases and the percent efficiency decreases. b. the energy lost to heat decreases and the percent efficiency increases. c. the energy lost to heat increases and the percent efficiency decreases. d. the energy lost to heat increases and the percent efficiency increases