Physics Questions

Physics Questions — Problem  1

Do heavier objects fall more slowly than lighter objects?
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Physics Questions — Problem  2

Why do objects float in liquids denser than themselves?
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Physics Questions — Problem 3

A particle is moving around in a circle and its position is given in polar coordinates as x = Rcosθ, and y = Rsinθ, where R is the radius of the circle, and θ is in radians. From these equations derive the equation for centripetal acceleration.
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Physics Questions — Problem  4

How come in free fall you feel weightless even though gravity is pulling down on you? (ignore air resistance when answering this question).
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Physics Questions — Problem  5

What is the difference between centripetal acceleration and centrifugal force? 
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Physics Questions — Problem  6

What is the difference between energy and power? 
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Physics Questions — Problem  7

Two identical cars collide head on. Each car is traveling at 100 km/h. The impact force on each car is the same as hitting a solid wall at:

(a) 100 km/h

(b) 200 km/h

(c) 150 km/h

(d) 50 km/h 
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Physics Questions — Problem  8

Why is it possible to drive a nail into a piece of wood with a hammer, but it is not possible to push a nail in by hand? 
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Physics Questions — Problem  9

An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g. What is the velocity of the arrow immediately after release? 
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Physics Questions — Problem 10

When a moving car encounters a patch of ice the brakes are applied. Why is it desirable to keep the wheels rolling on the ice without locking up?
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