## BSL Physics Glossary - average speed - example

Colin: So we have three metres marked out here. What's that?

Gary: That's the car.

Colin: What are we measuring here?

Gary: The average speed.

Colin: Average speed. Right. So we start the timer here, and stop it after the car has gone three metres.
As the car starts I will start the timer. So let's just go over what the formula is for average speed.

Gary: It's distance travelled divided by time.

Colin: Right. Distance travelled divided by time. And what measurement do we use for length?

Gary: Metres.

Colin: What do we measure time in?

Gary: Seconds. So the speed is measured in metres per second.

Colin: Right. That's speed. Are you ready?

(Car runs down the bench)

Colin: So that is 3 metres divided by 2.66

(Colin does calculation with calculator)

1.12 m/s

Gary: So what is the average speed? One point what?

Colin: 1.22

Gary: 1.22 metres per second.

Colin: Yes. That's the average speed.