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23 Cards in this Set

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Displacement
Distance in a given direction.
Velocity
The rate of change of displacement.
Acceleration
Rate of change of velocity.

Newton’s first law of motion

A body’s velocity does not change unless a force acts on it.

Newton’s second law of motion

The rate of change of a body’s momentum is proportional to the force acting on it and takes place in the direction of the force.

Newton’s third law of motion

Every action ha an equal and opposite reaction.

Force

A force is anything that changes an objects velocity.

Momentum

mass x velocity

Couple

Two forces that have a turning effect only

Conservation of momentum

In an interaction in a closed system, the total momentum is constant.

Conditions for equilibrium

The algebraic sum of the forces is zero. The algebraic sum of the moments is zero.

Power

rate at which work is done

Energy

The ability to do work.

Principle of conservation of energy energy

Energy cannot be created or destroyed but is changed from one form to another.

Centripetal force

the force towards the centre on an object in a circular path.

Angular velocity

The rate of change of angular displacement.

Newton’s law of gravitation

The force between 2 point masses is proportional to the product of the masses and inversely proportional to the square of the distance between them.

Weight

The pull of gravity.

Density

The mass of unit volume

Pressure

The force per unit area.

Moments

The turning effect of a force.

Work

This is done when a force moves an object.
Mass
The amount of matter in an object.