1. Physics Review Physics Practice Problems Key

2. Question #1: You walk 100 meters in 15 seconds. What was your average speed in meters per second?

3. Answer #1: s=d/t s=100m/15s s=6.67 m/s

4. Question #2: You travel by car from Mundelein to Glenview, Illinois. You travel the 22 miles in 32 minutes. What was your average speed in miles per minute?

5. Answer #2: s=d/t s=22 mi/32min s=0.69 mi/min

6. Question #3: You are riding your bicycle in a straight line at a constant speed of 12 km/h. Did acceleration occur? Please answer in a complete sentence.

7. Answer#3: No. Acceleration did not occur because the bicycle did not change speed or direction.

8. Question #4: You are riding your bicycle at a constant speed of 15 km/h around an oval track. Did acceleration occur? Please answer in a complete sentence.

9. Answer #4 Yes. Acceleration did occur because the bicycle changed direction.

10. Question #5: A weightlifter completes a benchpress of 300 N. She moves the weight 0.54 m. Calculate the work the weightlifter completed.

11. Answer #5: W=Fd W=300N  0.54m W=162J

12. Question #6: A tractor pulls a 5000N force a distance of 2 m. Calculate the work the tractor did.

13. Answer #6: W=Fd W=5000N  2m W=10,000J

14. Physics Review Physics Unit Review Key

15. Question #1: What is force? List the types of forces acting on objects.

16. Answer #1: Force is any push or pull on an object. Common forces include applied, friction, air resistance, gravity, and normal.

17. Question #2: What is work? How do we measure work?

18. Answer #2: Work is a transfer of energy. Work is measured in Joules (J).

19. Question #3: What objects make work “easier”?

20. Answer #3: Simple machines make work easier.

21. Question #4: Give examples of the following simple machines: inclined plane, screw, wedge, and lever.

22. Answer #4: Inclined plane: Ramp Screw: screw, bolt Wedge: Axe Lever: teeter-totter, claw end of hammer

23. Question #5: Explain Newton’s Laws of Motion.

24. Answer #5: 1 st : Inertia; an object at rest will stay at rest or an object in motion will stay in motion unless acted on by an outside force. 2 nd : F=ma; to move a mass you need a force. The bigger the mass is the more force force one needs to apply. 3 rd : Action/Reaction; for every action there is an equal, but opposite reaction.

25. Question #6: What is the difference between speed and velocity?

26. Answer #6: Both speed and velocity are rates of distance per unit of time, however, velocity also indicates a direction.

27. Question #7: What is acceleration?

28. Answer #7: Acceleration is any change in the speed or direction of an object.

29. Question #8: Write down formulas used in this unit.

30. Answer #8: Speeds=d/t Momentump=mv WorkW=Fd ForceF=ma DensityD=m/v Volume: Amount of space an object takes up. Surface area: The sum of all areas on a surface.