PHYSICS CAT ONE

NAME……………………………………………………………………..

ADM NO……………………………………………………………………

INSTRUCTIONS: ANSWER ALL QUESTIONS CORRECTLY.

Problem # 1

Do heavier objects fall more slowly than lighter objects?

Problem # 2

Why do objects float in liquids denser than themselves?

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.

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).

Problem # 5

What is the difference between centripetal acceleration and centrifugal force?

Problem # 6

What is the difference between energy and power?

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

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?

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?

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?