# Measuring instantaneous speed analysis (v=s/t)

I can accurately measure the instantaneous speed of a dynamics trolley and analyse patterns in its behaviour.

# Measuring instantaneous speed analysis (v=s/t)

I can accurately measure the instantaneous speed of a dynamics trolley and analyse patterns in its behaviour.

## Slide deck

## Lesson details

### Key learning points

- A dynamics trolley speeds up (accelerates) along the whole length of a steep ramp.
- Instantaneous speed is the average speed over a very short time period.
- Taking measurements by reading the timing lines at eye level improves accuracy.
- Repeated readings by different observers helps to check for systematic errors.

### Common misconception

It is important for the same person to take all the measurements.

Emphasise that if the method is a good one then everyone carrying it out carefully should get similar results that show the same pattern (the results are repeatable and reproducible).

### Keywords

Repeatable - A measurement is repeatable if the same (or similar) results are obtained when the same person repeats the investigation using the same method.

Reproducible - A measurement is reproducible if the same (or similar) results are obtained when the same person repeats it using a different method, or a different person repeats it using the same method.

Instantaneous speed - The instantaneous speed of an object is its speed at a particular moment in time.

Directly proportional - If two variables are directly proportional, when one variable increases, the other increases at the same rate.

### Content guidance

- Equipment requiring safe usage.

### Supervision

Adult supervision recommended.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Worksheet

## Starter quiz

### 6 Questions

distance -

metres

time -

seconds

mass -

kilograms

speed -

metres per second

$$s$$ -

distance (displacement)

$$v$$ -

speed (velocity)

$$t$$ -

time

## Exit quiz

### 6 Questions

repeatable -

when the same results can be achieved by the same person and method

reproducible -

when the same results can be achieved by a different person or method

instantaneous speed -

the speed at a particular moment in time

direct proportional -

when one variable is a constant multiple of the other