Mechanics definitions: CAIE Physics A-level

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Common definitions one needs to know for Mechanics

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11 Terms

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Define Force

The rate of change of momentum

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Define the moment of a force

force x perpendicular distance (of line of action of force to the point)

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State the principle of conservation of momentum

total momentum before (a collision) = total momentum after if no resultant external force/ for an isolated system

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Define momentum

The mass of a body times its velocity

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Define velocity

Change in displacement / time taken.

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Define the centre of gravity

The point at which the whole weight of the body may be considered to act

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Define the centre of mass

The point at which the whole mass of the body maybe considered to act

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Define work done

The force multiplied by the displacement in the direction of the force.

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Define power

Work done per unit time.

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State what is meant by the mass of a body

Mass is the quantity of matter

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State Newton’s 2nd Law

(resultant) force proportional to rate of change of momentum