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Physics Review

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Physics Review

Physics Practice Problems Key

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

s=d/t

s=100m/15s

s=6.67 m/s

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?

s=d/t

s=22 mi/32min

s=0.69 mi/min

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.

No. Acceleration did not occur because the bicycle did not change speed or direction.

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.

Yes. Acceleration did occur because the bicycle changed direction.

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

W=Fd

W=300N0.54m

W=162J

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

W=Fd

W=5000N2m

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:

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.

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.