7Kd(7)
Changing speed 1
Name
Class
5 km/h
Al
Date
Bev
0 km/h
Charlie
6 km/h
2 km/h
Dinesh
Ellie
4 km/h
Look at the drawings of the kayakers.
1 a Who is moving the fastest?
b Who is not moving at all?
2 Bev will continue to move at 5 km/h. How can you tell this from the drawing?
3 What will happen to Al’s speed?
Explain your answer.
4 What will happen to Charlie’s speed?
Explain your answer.
5 What will happen to Dinesh’s speed?
Explain your answer.
6 What will happen to Ellie’s speed?
Explain your answer.
7 What is causing the forces in the drawing that are slowing the kayaks down?
8 The drawing does not show all the forces on the kayaks.
Add two arrows to Al’s kayak to show the missing forces.
I CAN...
Exploring Science
• identify balanced and unbalanced forces
• use force diagrams to work out how the speed of an object will change.
edition
480
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