Forces and Motion

What is force?

• the pulling force that stretches objects

• to apply strength or effort

• a push or pull

• a force that goes against movement of an object

What is tension force?

• the pulling force that stretches objects

• to apply strength or effort

• a push or pull

• a force that goes against movement of an object

What does contact forces mean?

• a push or pull that happens when two objects touch

• to apply strength or effort

• a force that does not need to touch an object to affect it, such as gravity

• a force that goes against movement of an object

The meaning of exert is...

• ...a push or pull that happens when two objects touch

• to apply strength or effort

• ...a force that does not need to touch an object to affect it, such as gravity

• a force that pulls things

The definition of noncontact forces is...

• ...a push or pull that happens when two objects touch

• to apply strength or effort

• ...a force that does not need to touch an object to affect it, such as gravity

• a force that pulls things

Gravity is...

• ...a push or pull that happens when two objects touch

• ...to apply strength or effort

• ...a force that does not need to touch an object to affect it, such as gravity

• ...a force that pulls things

There are two _________  forces on the wagon.

• contact

• noncontact

They are the _________ the boy exerts and the ________ between the ground and the wagon.

• push / friction

• pull / friction

• push / push

• pull / push

Which explains why one of the bike riding forces listed in the table is incorrect?

• Push of feet is not a contact force because the pedals do not push back.

• Push of hands is a noncontact force because it does not make the bike move.

• Gravity is a contact force because it pushes the bike rider and the bike down.

• Friction is a contact force because the bike tire and the ground are touching.

Madison and her friends are putting on a lay. They need to move a heavy couch during scene changes. It must be moved quickly. The couch is hard to push on the rug.

Look a the picture of Madison trying to push the couch.

What does the arrow show?

• gravity

• friction

• a noncontact force