Newton's Second Law

Newton’s Second Law states that:

• Objects will stay at rest unless acted on by a force.

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

• Force equals mass times acceleration.

• Energy cannot be created or destroyed.

If a net force is applied to an object, what happens?

• It always moves at a constant speed.

• It always changes direction.

• It accelerates.

• Its mass increases.

A car of mass 1,000 kg accelerates at 2 m/s. What is the net force on the car?

• 200 N

• 500 N

• 2,000 N

• 20,000 N

If the same force is applied to a small mass and a large mass, what happens?

• Both accelerate equally.

• The smaller mass accelerates more.

• The larger mass accelerates more.

• Neither accelerates.

Doubling the net force on an object while keeping its mass the same will:

• Double its acceleration.

• Halve its acceleration.

• Have no effect.

• Stop the object moving.

If an object experiences no net force, according to Newton’s Second Law:

• It must be at rest.

• It accelerates at 9.8 m/s².

• Its mass decreases.

• It continues moving at a constant velocity.

Which situation best demonstrates Newton’s Second Law?

• A ball rolling until friction stops it.

• Two ice skaters pushing against each other and moving apart.

• A rocket accelerating upward as its engines fire.

• A book resting on a table.

What is the SI unit of force?

• Kilogram (kg)

• Newton (N)

• Joule (J)

• Watt (W)

What is the SI unit of mass?

• Gram (g)

• Newton (N)

• Kilogram (kg)

• Meter (m)

What is the SI unit of acceleration?

• Meter (m)

• Meter per second (m/s)

• Meter per second squared (m/s²)

• Kilometer per hour squared (m/s²)