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Slide 2

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Fred walks at 2ms-1 like this.
His pedometer measures he
has walked a distance of 400m
How long did it take?
"speed = distance/time" --> "time = distance/speed"
time = 400 / 2 = 200 seconds…read more

Slide 3

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Displacement is a measure of distance and direction.
It has to be in a straight line.
The convention is to use the
letter s to represent it.
s
300m
Fred's displacement is 300m
Velocity is a measure of speed and direction.
It has to be in a straight line.
The convention is to use the letter v to represent it.
"speed = distance/time" becomes:-
average velocity = displacement
time…read more

Slide 4

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From before, time = 200 seconds
s
300m
Fred's displacement is 300m
average velocity = displacement
time
v = 300 = 1.5 ms-1
200…read more

Slide 5

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-150m 150m
start
After 1 minutes hopping,
rabbit's displacement is 150m from the start.
After 1 minutes prowling,
lion's displacement is -150m
A negative displacement indicates that
it is in the opposite direction
Rabbit's average velocity = 150 metres = 2.5 ms-1
60 seconds
Lion's average velocity = -150 metres = -2.5 ms-1
60 seconds
A negative velocity indicates that
it is in the opposite direction…read more

Slide 6

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Average speed is the total
distance traveled by an object
divided by the time taken to
travel that distance.
Instantaneous speed is an
object's speed at a given instant
of time.…read more

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