Motion

DISTANCE-TIME GRAPHS

• On a distance-time graph a straight horizontal line represents a time where the object is stationary, when there is a straight line that slopes upwards it represents the object moving at a constant speed.
• The gradient of a distance-time graph for an object represents the speed of the object.

speed (m/s)= distance travelled in metres (m) / time taken in seconds (s)

VELOCITY AND ACCELERATION

• Velocity is speed in a given direction.
• Acceleration is change of velocity per second. The unit of accerleration is m/s  .
• Acceleration = change in velocity / time taken
• Decerlation is the change in velocity per second when the object is slowing down.

An object moving steadily round in a circle…