Slides in this set
Speed and Velocity
·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
Distance (m) is a scalar quantity. (no
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
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.
Displacement: 140m to the right…read more
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
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