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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.