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Physics ReviewPhysics 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/15ss=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/ts=22 mi/32mins=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=FdW=300N0.54mW=162J
Question #6:
A tractor pulls a 5000N force a distance of 2 m. Calculate the work the tractor did.
Answer #6:
W=FdW=5000N2mW=10,000J
Physics ReviewPhysics 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: RampScrew: screw, boltWedge: 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:Speed s=d/tMomentum p=mvWork W=FdForce F=maDensity D=m/vVolume: Amount of space an object takes up.Surface area: The sum of all areas on a surface.