Forces and Elasticity (H)

A material that goes back to its original shape when all the forces are removed is described as ...

• inelastic

• elastic

• hard

• soft

A spring has a natural length of 4cm and when masses are added, its new length is 18cm. What is the extension?

• 14cm

• 18cm

• 22cm

• 15cm

What is the relationship between the force applied to a spring and its extension?

• they are negatively correlated

• they are inversely proportional

• they are directly proportional

• they increase

Has this material stretched beyond the limit of proportionality?

• Yes

• No

• Maybe

• I don't know

What is Hooke's law?

• F=kl

• k=Fe

• F=ke

• F=0.5ke

What are the units for the spring constant?

• N/m

• Nm

• $N^2m$
  

• k

Which spring has the greatest spring constant?

• A

• B

• You cannot tell

• They are the same

Which spring has the highest spring constant?

• the spring used in the experiment

• the spring in my pen

• a car suspension spring

• a spring in a keyboard

What is the equation to work out the elastic potential energy stored in a spring?

• $E=\frac{1}{2}ke^2$

• $E=\frac{1}{2}k^2$

• $E=ke^2$

• $E=\frac{1}{3}ke^2$

How does the energy stored in a spring relate to a force-extension graph?

• it is the gradient

• it is the steepness of the line of best fit

• it is the area underneath

• it does not relate