# Physics Review Physics Practice Problems Key. Question #1: You walk 100 meters in 15 seconds. What was your average speed in meters per second?

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Physics Review Physics Practice Problems Key

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

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

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?

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

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.

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

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.

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

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

Answer #5: W=Fd W=300N  0.54m W=162J

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

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

Physics Review Physics Unit Review Key

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

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

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

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

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

Answer #3: Simple machines make work easier.

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

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

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

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.

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

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

Question #7: What is acceleration?

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

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

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.

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