Explain Newton's laws of motion

The first law is that an object will remain at a constant velocity or stationary (which is just a constant velocity of zero) unless acted upon by an external force.

Once acted upon by this force, then the second law comes into play. This says that F = ma, or Force equals mass times the acceleration of the object.

The third law is easily stated as every action has an equal and opposite reaction. This means the sizes of the forces on the objects will be the same, but the forces will be in opposite directions.

HM

Related Physics GCSE answers

All answers ▸

When should you use the SUVAT equations?


A ball is dropped from a height of 20m. How long does it take for the ball to reach ground?


A 100kg weight is placed 0.75 meters from a see-saw on the right hand side. Dan is 75kg. How far away does he have to sit from the pivot on the left hand side to have it balance?


Alice and Bob are sat on a seesaw. The seesaw is in static equilibrium. Alice weighs 500N and is sat 0.5m to the left of the pivot. If Bob weighs 800N, how far from the pivot on the right is he sat? What happens if Bob moves closer to the pivot?