Year 8: Force and Extension

An elastic material can change shape when ________ is exerted on it.

• a force

• a moment

• an acceleration

If tension is applied, the object may be stretched.

We say the object has been __________.

• compressed

• extended

• twisted

If a compression force is applied, the object may be squashed. We say the object has been __________.

• compressed

• extended

• twisted

A deformation is a change in _________.

• speed

• shape

• direction

Which equation could be used to calculate the extension of an object?

• extension = stretched length × original length

• extension = stretched length ÷ original length

• extension = stretched length + original length

• extension = stretched length – original length

What is the extension of the spring?

• 6 cm

• 9 cm

• 3 cm

• 2 cm

Which materials do not break easily and return to their original shape when forces acting on them are removed?

• Elastic

• Strong

• Plastic

• Brittle

Robert Hooke investigates springs by seeing how a load affected their.....

• extension

• correlation

• temperature

• energy

Hooke's Law does not apply if....

• the spring is stretched too far

• the spring is compressed

• the spring is not made of steel

• masses are used instead of weights

The elastic limit is the point at which ..

• the spring does not return to its original size

• the spring snaps

• there is no more room to attach masses

• the spring unravels