Forces Quiz (Week 1)

What keeps the Earth in orbit but does not pull the Earth so much that the planet crashes into the sun?

• The gravity of the Earth

• The gravity of the sun

• The gravity of the moon

• The gravity of Mars

What is the movement of an object called?

• Force

• Movement

• Gravity

• Friction

What happens to the motion of an object when the net force is zero?

• It accelerates

• It decelerates

• It changes direction

• It does not change

The force of gravity pulls the book towards the surface. The normal force acts in a __________ and __________ direction so that the book does not move.

• upward, downward

• left, right

• equal, opposite

• horizontal, vertical

What force is responsible for keeping the planets in orbit around the sun?

• Magnetic force

• Gravitational force

• Electric force

• Nuclear force

Which of the following is not a contact force?

• Frictional force

• Tension force

• Gravitational force

• Normal force

What is the sum of all the forces acting on an object?

• Friction

• gravity

• normal force

• Net Force

True or False: Different types of surfaces create different amounts of friction.

• True

• False

Friction is caused by:

• surfaces rubbing against each other

• objects heating up or cooling down

• rough surfaces

• smooth surfaces

The forces that result when two objects do not physically touch are called

• Contact forces

• Non-contact forces

• Buoyancy

• Applied force