Hooke's Law and Circular Motion

A tennis ball on a string is spun clockwise around a circle. After the string breaks, which path will the tennis ball follow?

• Path I

• Path II

• Path III

• Path IV

A body, B, is moving at constant speed in a horizontal circular path around point P. Which diagram shows the direction of the velocity (v) and the direction of the centripetal force (Fc) acting on the body?

• 1

• 2

• 3

• 4

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

The velocity is always _____ to the line of a circle. 

• outwards
• towards the center
• tangent
• faster

If F is force, k is spring constant and x is extension, Hooke's Law tells us that:

• F=k/x
• x=Fk
• k=Fx
• F=kx

A graph of extension against force for an elastic material is:

• A downward curve
• An upward curve
• A straight line from any point on the x and y axis
• A straight line from the origin

A stiff material has a:

• high spring constant
• low spring constant
• spring constant of any value
• spring constant which is difficult to predict

A spring has a spring constant of 5N/cm.  What is its extension when loaded with 15N?

• 4cm
• 5cm
• 3m
• 3cm

A spring extends 1.5m under load 10N. What is its spring constant?

• 0.15N/m
• 10N/m
• 6.7N/m
• 15N/m

If the Earth's gravitational field strength is 10N/kg, how much weight does a 100g mass have in Newtons?

• 100g
• 10N
• 1N
• 1000N