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# Linear Motion

Second The unit of time
Metre The unit of distance
Speed The rate of change of distance with respect to time
Metre per second The unit of speed
Instantaneous speed Average speed over a very short time
Average speed Average speed over the whole journey
Displacement Distance in a given direction, measured in metres
Velocity The rate of change of displacement with respect to time. The unit is the meter per second
Acceleration Acceleration is the rate of change of velocity with respect to time. The unit is the m/s2
Equations of motion V = u + at S = ut + ½ at2 V2 = u2 + 2as
Acceleration due to Gravity “g” In the absence of resistance all objects will fall with the same acceleration when they are near the earth’s surface. This acceleration is g. It is 9.8ms-2 on the surface of the earth
Scalar Quantity A quantity which has magnitude only
Vector Quantity A quantity which has both magnitude and direction
Created by: jacburke