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Distance, Time, Velocity and Acceleration

GCSE Additional Science Physics P2

Joe Stephenson

on 2 October 2012

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Transcript of Distance, Time, Velocity and Acceleration

Physics P2 Distance, Time, Velocity and Acceleration How do we calculate the speed of an object?
What is the difference between speed and velocity?
Can we use graphs to show motion?
What does the graph tell us about this motion?
What is acceleration? Learning outcomes What is speed?

What can it tell us about motion? Usain Bolt For a moving object we can calculate speed using the following formula: The scientific unit for speed is metres per second (m/s) Usain ran 100 metres in 9.64 seconds
This was an Olympic Record…

What was his speed? Speed... Speed = distance ÷ time

Distance = 100 metres
Time = 9.64 seconds In small groups, obtain a stopwatch and tape measure.

You should produce a distance-time graph with three sets of data:

Measure out a 10 metre line
Time the same person moving at each speed across the distance.

Can you match Usain Bolt? Practical http://www.youtube.com/

watch?v=2O7K-8G2nwU Speed = 100 ÷ 9.64 = 10.4m/s Answer... Speed = Distance ÷ Time Next... Collect a piece of graph paper, a ruler and a pencil.

Draw a graph:
Time (x axis) against Distance (y axis)

Plot each line onto the graph. Copy and complete the results table: Answer the following questions:
What is the fastest method of motion? How do you know this?

'The steeper the line the faster the motion' - Is this comment correct? (Use your graph to answer this).

Comment on the accuracy of your measurements. Speed vs Velocity Speed and velocity are different...

Do you enjoy rollercoasters?

Why are rollercoasters exciting? Rollercoasters are exciting because of speed and velocity!

You have high speed but you also change direction a lot...

This is velocity...
But... what is it? Speed is how fast an object moves over a set distance

Velocity is speed in a given direction Examples... A car drives around a circular track at 30mph. Comment on the car's velocity.

Two cars drive along the same road at 60mph. One heads north and the other heads south. Comment on the two cars speed and velocity. Formula triangles... As long as we know two of the values, we can work out the third! Summary - Speed tells you the distance travelled in a given time. (d=s/t)
- Velocity is speed in a given direction.
- We can use distance-time graphs to show speed and velocity.
- A steep line means faster motion.
-A straight line means constant speed.
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