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Understanding Average Speed, Work, and Newton's Laws in Physics

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This document provides a series of physics questions and answers related to average speed, work, forces, and Newton's laws of motion. It covers practical examples such as calculating average speed for walking and driving, determining the presence of acceleration, and computing work done by various forces. Key concepts like speed versus velocity, the role of simple machines, and the fundamental laws governing motion are discussed with clarity. Essential formulas, including those for speed, momentum, force, and work, are outlined for easy reference.

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Understanding Average Speed, Work, and Newton's Laws in Physics

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  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: 1st: 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. 2nd: F=ma; to move a mass you need a force. The bigger the mass is the more force force one needs to apply. 3rd: 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: Speed s=d/t Momentum p=mv Work W=Fd Force F=ma DensityD=m/v Volume: Amount of space an object takes up. Surface area: The sum of all areas on a surface.

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