4th Grade Review 5

What is a contact force?

• objects must touch to cause movement

• objects don't have to touch to cause movement

What is a noncontact force?

• objects must touch to cause movement

• objects don't have to touch to cause movement

Friction is a -

• contact force

• noncontact force

Gravity is a -

• contact force

• noncontact force

The more MASS an object has ----

• the more gravitational pull it has

• the less gravitational pull it has

The less MASS an object has ----

• the more gravitational pull it has

• the less gravitational pull it has

The closer two objects are to each other --

• the more gravitational pull there is

• the less gravitational pull there is

The farther away two objects are to each other --

• the more gravitational pull there is

• the less gravitational pull there is

Which is a balanced force?

• a cup sitting on a table

• a car going down the street

• a dog running

• a frisbee flying through the air

Which is an unbalanced force?

• a book on a bookshelf

• a car going down the road

• a car stopped at a red light

• a game of tug-of-war when nobody is winning