Understanding Motion and Forces

Which of the following is an example of linear motion?

• A spinning top

• A car driving on a straight road

• A pendulum swinging

• A satellite orbiting Earth

What does Newton's First Law of Motion state?

• For every action, there is an equal and opposite reaction.

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

• Force equals mass times acceleration.

• The gravitational force between two objects depends on their masses and the distance between them.

According to Newton's Second Law, what is the formula for force?

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

• Frictional force

• Gravitational force

• Magnetic force

• Nuclear force

What is the unit of force in the International System of Units (SI)?

• Joule

• Newton

• Watt

• Pascal

Which of the following is an example of a contact force?

• Gravitational force

• Magnetic force

• Frictional force

• Electrostatic force

What happens to the motion of an object if the net force acting on it is zero?

• It accelerates.

• It changes direction.

• It remains constant.

• It stops immediately.

Which of the following is an example of a non-contact force?

• Frictional force

• Tension force

• Gravitational force

• Normal force

What is the effect of friction on the motion of an object?

• It speeds up the object.

• It slows down the object.

• It changes the direction of the object.

• It has no effect on the object.