1. Starter -Match the
velocities
30 km day-1
30 km hour-1
30 km min-1
30 km s-1
300 km ms-1
Make a little
table

2. Velocity vectors
Mapping space and time lesson 4

3. LI…
 Know that velocity is a vector
 Use velocity = displacement/time (v =s/t)
 Resolve velocity vectors

4. Scalar or vector
 Speed is scalar
speed = distance
time
v = s / t
Measured in metres
per second ms-1
 Velocity is a vector
velocity = displacement
time
v = s / t
Measured in metres
per second ms-1

5. Velocity and speed of
earth around the sun
 Speed is large and constant
 Velocity changes all the
time
 Average velocity over one
year is zero
sun
dec
jun
mar
jul
sep
y
x

6. Adding vectors – tail wind
 A plane can fly at 120 ms-1 in calm conditions, if it
has a tail wind of 20 ms-1, how fast will it fly?
 The resultant velocity is the sum of the two. You
add them.
 To add vectors you put them tip to tail.
120 ms-1
140 ms-1
20 ms-1

7. Adding vectors – Head
wind
 A plane can fly at 120 ms-1 in calm conditions, if it has a
head wind of 20 ms-1, how fast will it fly?
 The resultant velocity is the sum of the two. You add
them.
 To add vectors you put them tip to tail.
120 ms-1
100 ms-1
20 ms-1

8. Adding vectors – Cross wind
 A plane can fly at 120 ms-1 in calm conditions, if it has a
cross wind of 20 ms-1, how fast will it fly?
 The resultant velocity is the sum of the two. You add
them.
 To add vectors you put them tip to tail.
120 ms-1
122 ms-1
20 ms-1
20
120

9. River crossing
 A motor boat can travel at 5 ms-1 in calm
conditions.
 The boat makes a crossing from the
south to north shore. The skipper
maintains a northward heading.
 The river runs west to east at 2 ms-1.
 What is the velocity of the boat as it
crosses? If the river is 50m where does
he land?
North shore
South Shore
2 ms-1

10. River crossing 2
 A motor boat can travel at 5 ms-1 in calm
conditions.
 The river runs west to east at 2 ms-1.
 The boat makes a crossing from the
south to north shore. The skipper
navigates along the route shown.
 What is the velocity of the boat as it
crosses? What direction does he need
to steer?
 How long does he take?
North shore
South Shore
2 ms-1