Gravitational Force

Friction force ........... the movement of objects.

• slows down

• increases 

• speeds up

• doesn't affect.

........ is considered as a type of friction force.

• Magnetism

• Gravity

• Air resistance

• Electric force

Magnetism is a force that attracts objects made of the following materials, except ...........

• iron.

• nickel.

• wood.

• cobalt.

In contact force, the two objects need to ........... each other.

• attract

• repel

• touch

• break

Gravity depends on the ........... of a body.

• speed

• mass

• length

• age