P2 1 Motion

1. The distance-time graph for a stationary object is a horizontal line
2. The distance-time graph for an object moving at a constant speed is a straight line that slopes upwards
3. The gradient of a distance-time graph represents the object's speed
   1. The steeper the line, the faster the object's speed

1. Velocity is speed IN A GIVEN DIRECTION
2. Acceleration is change in velocity per second

   Anexos:

   • Maths for P2
   1. Acceleration therefore means change in speed OR CHANGE IN DIRECTION
   2. The unit of acceleration is metres per second squared
3. Deceleration is the change of velocity per second when an object slows down
   1. If the result of an acceleration calculation is negative, it means the object is deceleratiing (slowing down)

1. If a velocity-time graph is a horizontal line, the velocity is constant so the acceleration is zero
2. The gradient of a velocity-time graph represents the acceleration
   1. The steeper the line, the faster the object's acceleration
   2. A downward sloping line means the object is decelerating (slowing down)
3. The area under the line on a velocity-time graph represents the distance travelled

Anexos:

• Maths for P2