F=KE and Elastic Potential Energy

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 spring extends 1.5 metres under a load of 10 newtons. What is its spring constant?

• 0.15 N/m

• 10 N/m

• 6.7 N/m

• 15 N/m

The units for elastic potential energy are...

• Joules, J

• metres, m

• centimetres, cm

• kilograms, kg

Which object has elastic potential energy?

• a hanging leaf

• a burning coal

• a rolling ball

• a stretched bow

What is the spring constant for the system shown above?

• 0.1 N

• 10 N

• 200 N/m

• 50 N/m

What is the potential energy stored in this spring when it is stretched to a displacement of 0.1 metres?

• 1 J

• 20 J

• 10 J

• 5 J

A stretched rubber band represents what type of potential energy?

• gravitational potential energy

• elastic potential energy

• chemical potential energy

• kinetic potential energy

Which object has elastic potential energy?

• a hanging leaf

• a burning coal

• a rolling ball

• a stretched bow

A stretched rubber band represents what type of potential energy?

• gravitational potential energy

• elastic potential energy

• chemical potential energy

• kinetic potential energy

A force of 480 N changes the spring length by 0.25 metres. Calculate the elastic potential energy in Joules.

Elastic Potential Energy = 1/2 x Force x extension length

• 30 Joules

• 60 Joules

• 90 Joules

• 120 Joules