1.3 dynamics

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This topic covers the concept of force and free body diagrams. It includes Newtons laws of motion and the concept of linear momentum.

9 Terms

1

Force

A force on a body is a push or pull acting on the body from some external body. Unit: N

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2

Newtons 3rd law

If body A exerts and force on body B then body B will exert an equal yet opposite force on A.

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3

Formula for resultant force.

Σ F = ma

The mass of a body x its acceleration.

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4

Momentum

The momentum of an object is its mass multiplied by its velocity (P= mv) Unit: Kg m s ^-1

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5

Newtons 2nd law in terms of momentum.

The resultant force is proportional to the rate of change of momentum.

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6

The principle of conservation of momentum

The vector sum of momentum remains constant provided there is no external force.

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7

Elastic collision

A collision in which there is no change in total kinetic energy.

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8

Inelastic collision

A collision in which kinetic energy is lost.

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