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Slide 1

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Speed and Velocity
Page 112-113
Learning objectives:
·How does displacement differ from distance?
·What is the difference between instantaneous
speed and average speed?
·When is it necessary to consider velocity rather
than speed?…read more

Slide 2

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Distance (m) is a scalar quantity. (no
direction involved)
In simple terms, `how much ground an object
has covered during its motion.'
Displacement (m) is a vector
quantity. (distance in a given direction)
Basically, `how far out of place an object is
from its starting point', it is the object's
overall change in position.…read more

Slide 3

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Speed(m/s) is a scalar quantity.
It is the change of distance per unit time.
Velocity(m/s) is a vector quantity.
It is the change of displacement per unit time or
speed in a given direction.…read more

Slide 4

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The diagram below shows a skier moves from A to B to C to D. Use
the diagram to determine the resulting displacement and the
distance travelled by the skier during these three minutes.
Distance: 420m
Displacement: 140m to the right…read more

Slide 5

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Motion at constant speed
`An object moving at a constant speed travels
equal distances in equal times.'
A car travelling at a constant speed of 30m/s
on a motorway. What would the speed of the
car be in km/h?
1 hour = 3600s
30 x 3600 = 108,000m=108km
The car travels at 108km per hour
So, 30m/s = 108km/h…read more

Slide 6

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For an object which travels distance s in the time
t at constant speed is
For an object moving at
constant speed on a circle of
radius r, its speed is
·T(s)=time to move round once
·2r(m)=circumference of the
circle…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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