Forces and Motion

What is the force that pulls objects towards the center of the Earth?

• wind

• friction

• gravity

• magnetism

Name the force that opposes the motion of an object when it comes in contact with another object.

• momentum

• inertia

• friction

• gravity

Explain the difference between static friction and kinetic friction.

• Static friction only occurs on rough surfaces, while kinetic friction only occurs on smooth surfaces.

• Static friction and kinetic friction are the same thing.

• Static friction occurs when two surfaces are moving relative to each other, while kinetic friction occurs when two surfaces are not moving.

• Static friction occurs when two surfaces are not moving relative to each other, while kinetic friction occurs when two surfaces are sliding past each other.

How does friction affect the motion of a moving object?

• Friction causes the object to change direction

• Friction opposes the motion of a moving object

• Friction has no effect on the motion of a moving object

• Friction accelerates the motion of a moving object

What is the force that causes an apple to fall from a tree to the ground?

• friction

• magnetism

• gravity

• wind

Explain how gravity affects the motion of a ball thrown in the air.

• Gravity pulls the ball back towards the ground.

• Gravity causes the ball to move sideways

• Gravity pushes the ball higher into the air

• Gravity has no effect on the motion of the ball

Give an example of a push force in everyday life.

• Pulling a door open

• Lifting a heavy object

• Pushing a door open

• Sitting in a chair

Give an example of a pull force in everyday life.

• Lifting a heavy object

• Sliding a book across a table

• Pulling a door open

• Pushing a door open

Explain how a push or pull force can change the motion of an object.

• Causing it to make a sound

• Causing it to disappear

• Causing it to speed up, slow down, or change direction

• Causing it to change color

What are the different types of forces acting on a book placed on a table?

• Gravitational force and normal force

• Kinetic force and potential force

• Electrical force and tension force

• Friction force and magnetic force