1.8 Tension and upthrust (Rivision)

Ropes, cords, and springs all stretch when you pull them.

• True

• False

A spring is 9 cm long. A student hangs a weight of 4 N on it. It is now 14 cm long.

What is the extension?

• 5 cm

• 23 cm

• 13 cm

The force in a rope that is being stretched is called ..............................

• gravitational potential energy

• tension

• friction

If something is ................................, it will go back to its original length when you remove the force

• nonelastic

• elastic

• plastic

The amount that something stretches is called the ...............................

• extension

• intension

• friction

If something is ..............................., and does not go back to its original length after stretching, we say it is plastic.

• elastic

• not elastic

A bigger force will produce a smaller extension.

• False

• True

Elastic materials will break if the force applied to them is too big.

• True

• False

Objects float when the upthrust ............................ the weight.

• is less than

• is greater than

• equals

A spring is 9 cm long. A student hangs a weight of 4 N on it. It is now 14 cm long.

What would be the length of the spring with a weight of 8 N?

• 5 cm

• 25 cm

• 19 cm