Forces & Motion Review

When added to smooth road surface which would create the greatest amount of friction for a car?

• Ice

• Rain

• Soap

• Sand

Don throws a ball in the air. The ball comes back to the ground because

• the wind pushes on the ball with friction.

• the mass of Earth creates a pull of gravity on the ball.

• the Earth core pulls on the ball with a magnetic attraction

• the weight of the atmosphere pushes down on the ball. the weight of the atmosphere pushes down on the ball.

Which of the following would increase the motion of a ball after it is kicked?

• a high, grassy surface

• A rocky driveway

• a surface sloped uphill

• a surface sloped downhill

Which investigation will BEST test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface a ball slowing down on a flat surface

How does motor oil help to keep a car’s engine from getting too hot?

• by reducing friction

• by increasing magnetic attraction

• by lowering the temperature of the air under the hood

• by increasing friction by increasing friction

What force must a person overcome in order to push a box across the flat surface?

• friction

• gravity

• mass

• density

When rolling a ball on the ground, what force makes it come to a stop?

• Mass

• Gravity

• Friction

• Altitude

Which surface will most likely cause a rolling ball to slow down the fastest?

• Ice

• Tile

• Glass

• Grass

Which best describes the relationship between movement and friction?

• As the friction increases, the rate of movement increases.

• As the friction increases, the rate of movement decreases.

• As the friction decreases, the rate of movement decreases.

• As the friction decreases, the rate of movement is unchanged As the friction decreases, the rate of movement is unchanged

2 students are pushing on opposite sides of the box. The box is not moving. Why?

• Unbalanced Force

• Balanced Force

• Motion

• Friction