# Physics 9 motion velocity acceleration

## 16 terms

### speed definition

is the change in distance divided by change in time

### motion definition

change in position

### velocity definition

speed in a given direction

### acceleration definition

rate of change of velocity

### reference point definition

location from which motion is measured

### m/s measures

speed and velocity

acceleration

### formula for acceleration

a = (final velocity - initial velocity)/ time taken
a =(v - u)/t

### velocity-time graph area

the area under a velocity-time graph = distance travelled

acceleration

### distance -time graph gradient is the ............

speed

A straight line means constant speed

### if the velocity-time graph gradient is horizontal ....

means no acceleration

### if distance -time graph gradient is horizontal ....

horizontal line means no speed (stopped)

a=velocity/time

### velocity-time graph gradient is a straight line going "up" ...

means constant acceleration

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