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PHYSICS CAT ONE NAME. ADM NO. INSTRUCTIONS:
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?
