Force, Motion, Gravity, Simple Machines Review

A broom is an example of a ______________.

• lever
• pulley
• wedge
• inclined plane

A doorknob is an example of a ____________________.

• wedge
• gear 
• lever
• wheel and axle

The lid or cap to a bottle or jar is an example of a ___________________.

• wedge
• lever
• screw
• gear

An axe is an example of a _______________.

• wedge and gear
• lever and screw
• wedge and lever

How might gravity affect the motion of an object?

• It pushes the object into the air
• It pulls the object toward the Earth
• It pushes the object sideways

Maria is using a wagon to move a bunch of heavy books. What simple machine is she using?

• screw
• wheel
• wedge
• incline plane

Leo is using a ramp to move a heavy load into a building. What simple machine is he using?

• screw
• wheel
• wedge
• incline plane

When the force exerted on an object is balanced, what happens to the object?

• It moves to the left.
• It moves to the right.
• It does not change its motion.
• It moves down.

When the force exerted on an object is unbalanced, what happens to the object?

• It goes in the same direction.
• It changes motion. 
• It stops.
• It spins around.

Which statement correctly describes an unbalanced force?

• Kicking a soccer ball
• A laptop in the cart
• A book resting on a desk
• A football in a backpack