Unit 1.1 Physics 0.0 / 5 PhysicsForcesASWJEC Created by: TigerLilly321Created on: 08-04-17 17:38 Quantity In S.I. a quantity is represented by a number x a unit 1 of 8 Scarlar A scalar is a quantity that has magnitude only 2 of 8 Vector A vector is a quantity that has magnitude and direction 3 of 8 Resolving a vector into components in particular directions This means finding vectors in these directions, which add together vectorially to make the original vector. 4 of 8 Density of a material ρ density= mass/volume 5 of 8 Moment of a force The force x the perpendicular from the point to the line of action of the force. (i.e. moment= F x d) (Unit: Nm) 6 of 8 The principle of moments For a system to be in equilibrium, the resultant anti-clockwise moments = resultant clockwise moments about the same point 7 of 8 Centre of gravity The centre of gravity is the single point within a body at which the entire weight of the body may be considered to act 8 of 8

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