N. Science 5th. Unit 6 Test: FORCES AND MACHINES.

A force can make an object                    moving, stop moving, change shape

or break.

• start

• stop

• change

• break

When we   ___ or pull on an object, we apply a force.

• star

• push

• stop

• point

The

          of forces vary depending on the materials.

• shape

• matter

• effects

• volume

Some objects change their shape

          and do not go back to their original shape.

• a lot

• a little bit

• temporarily

• permanently

Others change their shape

          and return to their original shape.

• temporarily

• a lot

• permanently

• a little bit

Rigid objects can ______

under a strong enough force.

• stay

• break

• live

• be

Look at the photos and tick (✓) the best surface to ride a bike on.

• 
• 
• 

What is friction?

• Friction is not a force that occurs when two objects rub againts each other.

• Friction is a force that occurs when two objects do not rub againts each other.

• Friction is a force that occurs when two objects rub againts each other.

Magnetism is a contact force that acts close up.

• True

• False

When we put the same poles

of two magnets together, they attract

each other.

• True

• False