Colegio San PatricioPeriod Exam IV Practice

PhysicsBasic concepts.

1. In physics, work is defined as _____ a. force divided by distance. b. force times distance. c. force times time. d. force divided by time. e. distance divided by time.

2. The unit of work is the _____a. joule. b. second. c. watt. d. newton. e. meter.

3. Potential energy is the energy an object has because of its ____a. temperature. b. density. c. speed. d. size. e. location.

4. An object that has kinetic energy must be ____a. at rest. b. moving. c. smiling. d. elevated

5. Power is defined as the ____a. work done times the time taken to do that work. b. work done on an object divided by the time taken to do the work. c. force on an object times the distance the object moves. d. force on an object divided by the time the force acts. e. distance divided by the time taken to move that distance.

6. The unit of power is the ____a. second. b. newton. c. watt. d. joule. e. meter.

7. Total mechanical energy is defined as ____a. kinetic energy. b. potential energy. c. sum of PE and KE. d. divide PE into KE.

Problem Solving.

8. A student lifts a bucket with a 98 N force out of a well. If the bucket is lifted 30 mHow much work was done?

9. A child pulls a wagon with a force of 20 N. The wagon moves 6 meters during the 5 seconds that the child is pulling it. Find the power.

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10. Calculate the following:

a. The potential energy at points A.

b. The potential energy at point B.

11. A 10kg object moves at 1 m/s. Find the kinetic energy of the object.

12. Suppose a moving car has 2000 J of kinetic energy. If the car's speed doubles,how much kinetic energy would it then have?a. 6000 J b. 2000 J c. 1000 J d. 8000 J e. 4000 J

13. Using these electronic components construct an electric circuit like the one you

used for your project.

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20 m

12 m

A

B

C

m = 20kg

14. Draw a free body diagram for each picture including all forces acting.

A lamp resting on the night stand.

A dog running at the park.

15. Identify each simple machine.

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