Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2

Page 3

Preview of page 3
Unit 1.1 - Kinematics
Scalars and Vectors
A quantity in Physics is something that can be measured. Any quantity is either a scalar or a vector.

A scalar quantity is fully described by its Magnitude (size) including its unit of measurement.
A vector quantity is fully described by its Magnitude…

Page 4

Preview of page 4
A cyclist is going on a journey round a country road.

If the red line represents a country road, then the distance the bike has to travel is

If the green line represents the displacement, then the displacement of the whole journey is 2km.

Speed and Velocity.

The speed…

Page 5

Preview of page 5
The velocity of an object is calculated by:

Page 6

Preview of page 6
Both of these are represented by:

Adding scalars and vectors

Adding scalars is easy ­ the magnitudes add up.

Adding vectors is not so easy ­ the direction means we cannot just add the magnitudes.

We add vectors using diagrams. Vectors are drawn as arrows.

The length of the arrow…

Page 7

Preview of page 7
This routine is sometimes known as adding vectors "tip to tail".

Vector tip Vector tail


The acceleration of an objects it its change of velocity with time.

The equation for acceleration is:


a = acceleration (ms-2)

Page 8

Preview of page 8
v = final speed (ms-1)

u = initial speed (ms-1)

t ­ time taken (s)

The acceleration equation re-arranged for final speed is...

The acceleration equation re-arranged for initial speed is...

The acceleration equation re-arranged for time is...

Instantaneous & Average Speed

Average speed is a measure of the distance…

Page 9

Preview of page 9
Let's say you are going on a car journey. You travelled a distance of 5 miles and the trip lasted 0.2
hours (12 minutes). The average speed of your car can be found by using the speed, distance time



S =distance travelled (m)

T= time…

Page 10

Preview of page 10
Your car may have been moving at speed of 25 miles per hour (this is an average speed)

BUT, during your trip, there may have been times that you were stopped and other times that your
speedometer was reading 50 miles per hour (this is an instantaneous speed).

Velocity time…


No comments have yet been made

Similar Biology resources:

See all Biology resources »