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12 Cards in this Set

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Motion at constant speed

S=ut

Average speed

V=distance/time

Distance-time graph

Gradient at a particular point is the instantaneous speed at that point, constant gradient=constant speed, zero gradient=stationary, negative gradient=object moves in opposite direction.

Displacement

Straight line from the starting point to the finishing point.

Velocity

The rate of change of displacement, velocity=distance/time

Acceleration

Rate of change of velocity. Increases speed if in the same direction. Decreases speed if in opposite direction. Change direction if velocity if at right angles to velocity.

Velocity-time graph

Gradient is acceleration. Line above the x-axis means motion to the right. Line below the x-axis means motion to the left. Horizontal line means constant velocity. Are between the graph and the x-axis is displacement.

Non-linear graphs

Divide are into trapeziuns and add up all areas to estimate total displacement.

Motion with uniform acceleration

SUVAT

Free-fall

Suvat with acceleration equal to -9.81ms-2. Speed at highest point is zero. Upwards displacements and velocities are positive; downward displacements and velocities are negative.

Projectile motion

Separate motion in the x and y axis

Independence of horizontal and vertical motion

An object dropped from rest and an object fired horizontally from the same height will both hit the floor at the same time; because horizontal and vertical motion are independent: horizontal motion has no effect on vertical motion.