Hooke's Law (KS3)

When a force is applied to an object it can change its...

(a)  

When we apply a force to an object to change its shape, what is this called?

• Extension

• Deformation

• Squashing

• Stretching

Which materials will return back to their original shape when they have been stretched?

• Plastic

• Elastic

• Inelastic

• Metals

What is extension?

• The original length of the spring.

• The amount of length the spring has increased by.

• More time to complete the question.

• The new length of the spring.

The original length of a spring is 10cm, its extended length is 30cm. What is the extension?

• 10

• 20

• 30

• 40

What happens when a spring reaches its elastic limit?

• The force applied to the spring is equal to its elongation.

• Hooke's law ceases to be valid.

• The spring constant increases.

• The spring can be stretched out but will revert back to its original shape.

Who created Hooke's law?

• Robert Hooke

• Isaac Newton

• Albert Einstein

• Dmitri Mendeleev

What is Hooke's Law?

• The force applied to the spring is proportional to its extension.

• The fore applied to the spring is equal to its extension.

• The force applied is equal to the spring constant.

• The spring constant is equal to the extension.

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 the origin

• A straight line from any point on the x and y axis