unit 7 -- Energy and Hooke's Law

Multiple Choice

According to Newton's 3rd Law, when a spring is deformed with a force of 55N, what must also be happening?

• the spring rebounds with 55N of pressure

• the spring constant changes to -55N

• the spring pushes back in the opposite direction with -55N

Multiple Choice

Why must measurements in centimeters be changed to meters when solving elastic potential energy problems?

• to be useful in the equation

• to calculate force

• to calculate work

Multiple Choice

How does the stored energy change if the spring constant is doubled?

• the force doubles

• the energy doubles

• the energy decreases because of deformation

Multiple Choice

What does the symbol k represent in Hooke's Law equation?

• the action-reaction force

• the deformation of the spring

• the work done on the system

• the spring constant

Multiple Choice

A spring has an elastic potential energy of 100 J when compressed 0.1 m. What is the spring constant?

• 10 J

• 10 N/m

• 20,000 N/m

• 20,000 J

Multiple Choice

How far is a spring extended if it has 1.0 J of E_p and its spring constant is 1,000 N/m?

• 45 m

• 0.045 N/m

• 0.045 J

• 0.045 m

Multiple Choice

What variable changes as the distance of deformation changes?

• the amount of Force

• the spring constant

• the kinetic energy

Multiple Choice

E_p is equal to the ___________ by an amount x.

• kinetic energy causing the force

• work done to deform the spring

• negative force of gravity