9.1 displacement time graphs, 9.2 velocity time graphs

On a displacement-time graph, what is velocity?

The rate of change of displacement

On a displacement-time graph, what does the gradient represent?

The gradient represents the velocity

If the displacement-time graph is a straight line, what is happening to velocity?

Velocity is constant

From a displacement-time graph, how do you calculate average velocity?

Displacement from starting point/time taken

From a displacement-time graph, how do you calculate average speed?

Total distance travelled/time taken

Example 1a

Example 1b,c

What must you state when you have to describe motion?

• The direction of travel

• Whether it is accelerating or decelerating

What is acceleration?

The rate of change of velocity

On a velocity-time graph, what does the gradient represent?

Acceleration

What does it mean if there is a straight line on a velocity-time graph?

The acceleration is constant

What is negative acceleration called?

Deceleration (or retardation)

What does the area between a velocity-time graph and the horizontal axis represent?

The distance travelled

Example 2

Example 3a

Example 3b