Romeo and Juliet Essay

951 WordsJan 4, 20134 Pages
Forces and their motions Distance time graphs The speed of an object is the distance travelled each second < the gradient of the line on a distance time graph represents the speed. * If an object is stationary, the line on a distance time graph is horizontal. * if an object is moving at a constant speed, the line on a distance time graph-time graph is a straight line that slopes upwards Speed in metres per second, m/s = distance travelled in metres, m time taken in seconds, s Velocity and acceleration Velocity is speed in a given direction Acceleration is the change of velocity per second Acceleration- positive Deceleration - negative If the velocity of an object changes we say that it accelerates. Acceleration = V-U T Acceleration = V-U T Acceleration is measured in metres per second m/s2 v is the final velocity in metres per second m/s u is the initial velocity in metres per second, m/s t is the time taken for the change in seconds, s Velocity time graphs * If the line on a velocity time graph was horizontal, the acceleration is zero. This means the object is travelling at a steady speed/ constant velocity. * The gradient of a velocity time graph represents acceleration. * The area under the line on a velocity time graph is the distance travelled. Using graphs * The speed of an object is given by the gradient of the line on a distance time

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