Week 12 Quiz

How might the shape of an object change if forces act away from each other in a straight line?

• 
  It might extend

• 
  It might compress

• 
  It might bend

Which word describes an object that will return to its original shape when forces are removed?

• 
  Plastic

• 
  Inelastic

• 
  Elastic

What is another name for the limit of proportionality?

• 
  Plastic limit

• 
  Elastic limit

• 
  Inelastic limit

What is the unit for the spring constant?

• 
  Newton-metres (Nm)

• 
  Newtons per metre squared (N/m²)

• 
  Newtons per metre (N/m)

What is the name for energy stored by a stretched spring?

• 
  Elastic potential energy

• 
  Gravitational potential energy

• 
  Kinetic energy

Look at the graph. Which material is the stiffest?

• A

• B

• C

• D

Determine the extension of the spring

• 8 cm

• 9 cm

• 10 cm

• 11 cm

If the force of 20 N is applied, calculate the spring constant (k)

By using the same spring as the question before, what is the extension, in cm, when a force of 30 N is applied?

A spring extends elastically by 10 cm when a force of 20 N is applied to it. What force would be needed to extend the spring by 5 cm?