____ 1. 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. 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. 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. 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. 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. 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. 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. 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.

____ 9. The force that ultimately lifts a basketball player upwards off the court in a slam-dunk jump is the: a. applied force b. tension c. torque d. normal force

____ 10. A boy on a swing is pulled to a position 2.34 m off the ground and released. At the fastest and lowest point of the swing the boy is 0.50 m off the ground and travelling 3 m/s. The percent efficiency of this swing system is: a. 10% b. 25% c. 50% d. 70 % ____ 11. If a 1.5 kg chicken is running with a speed of 10.0 m/s, its kinetic energy is: a. 150 J b. 7.5 J c. 75 J d. 6.7 J ____ 12. A ball is dropped from a height of 3.0 m. As it falls a. its gravitational potential energy increases and its kinetic energy increases. b. its gravitational potential energy increases and its kinetic energy decreases. c. its gravitational potential energy decreases and its kinetic energy increases. d. its gravitational potential energy decreases and its kinetic energy decreases.

____ 13. If done long enough, rubbing two sticks together can produce enough work to start a fire. If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is: a. 2.00 m b. 5.00 m c. 10.0 m d. 100.0 m

____ 14. The amount of energy used by a 100 W light bulb in 1 minute is: a. 6000 J b. 100 J c. 600 J d. 1.7 J e. 60 000 J

____ 15. Which of the following energy transformations best describes the operation of a battery powered flashlight? a. electrical energy --> thermal energy --> kinetic energy b. thermal energy --> elastic potential energy --> electrical energy c. radiant energy --> electrical energy --> chemical potential energy d. chemical energy --> electrical energy --> radiant energy

____ 16. If two 100 resistors are placed in parallel, their total resistance changes by what factor compared to the same two 100 resistors placed in series with each other: a. the same b. twice c. half d. one quarter

____ 17. How will the current in the first ammeter compare with the reading in the second? a. A1 has a current reading while A2 has a reading of zero. b. A1 and A2 are equal. c. A1 is less than A2. d. A1 is greater than A2.

2 W E S