1. A M E
9 Forces and Motion test Test A Name___________________________
1. Match up the statements below with the correct word that describes the forces listed in the
table.
The force that occurs when two objects are in contact (touching)
The force that occurs at both ends of a rope or string.
The force caused by the pull of gravity.
Weight
Friction
Tension
2. Describe what a friction force does as an object moves over a surface.
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3. Look at the following diagram of the skier.
Write two or three sentences to explain……
Why the skier goes faster as she goes down the ski slope.
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Jasmine and Flora are playing a game of soccer. Flora kicks the ball past Jasmine’s weak defence
and scores a goal.
Explain, using the help of the diagram below,
4a) What forces act on the ball while it is in the air – draw arrows to show the force(s)
4b) Why it changes its vertical motion as it moves through the air.
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2. 5. A utility truck carrying designer clothes for a Karen Walker fashion parade has become bogged in
mud and the back wheels are spinning due to a lack of friction.
a) Explain how putting more weight in the back of the truck will help to remove the
truck from the mud.
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b) Explain how placing wooden planks under the wheels of the truck will help increase the
friction force on the wheels.
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6. Name the term given to substances that can reduce friction.
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7. Sarah convinces her dad to erect a swing in their back yard. He finds and old tyre and ties it to a
tree with a piece of rope.
(a) On the diagram below, name and draw the forces acting on the swing when there is nobody on
the swing.
(b) How do you know that these two are balanced forces?
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(c) When Sarah sits on the rope to swing, her weight force pulls down on the rope. Her mass is equal
to 60kg. Calculate her weight. g = 10N/kg
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d) Complete the_following table
mass in grams mass in kg weight in newton
1200 g
3.20 kg
650 N
400 g
70 g

3. 8. Look at the following diagrams that represent speed/time graphs. Using the following words, choose
which best describes the movement shown by each of the graphs. Deceleration, stationary, constant
speed, acceleration.
v v v v
a) t b) t c) t d) t
(a) _______________________________
(b) _______________________________
(c) _______________________________
(d) _______________________________
9. The following is a distance/time graph of Sarah’s bike ride for a training session on a Saturday
afternoon.
distance (m)
80
70
60
50
40
30
20
10
time (s)
0 2 4 6 8 10 12 14 16
(i) (ii) (iii) (iv)
(a) Describe what is happening at each stage of the journey.
(i) ________________________________
(ii) ________________________________
(iii) ________________________________
(iv) ________________________________
(b) During the time of constant speed Sarah cycled 600 metres in 48 seconds. Use your calculator to
find her speed.
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On the line below draw in bars to show what happens to size of the distances she cycled each second
as she
(c ) accelerates ____________________________________________________________________
(d) decelerates _______________________________________________________________

4. (e) moves at constant speed ________________________________________________________
On a different day Sarah was in car going to Hamilton. She thought she could stay at an average speed
of 80 km p hr. She saw a sign to say that the distance to Hamilton was 120 km.
(f) If the time was 11.00 am at what time will she reach Hamilton if she keeps at the average speed
of 80 km p hr? Explain you answer carefully and fully.
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(g) However Sarah knew that she would be later than this time since she could not expect
to keep an average speed of 80 km p hr.
Explain why she was expecting to be later:
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(h) Dragsters are fast cars that accelerate quickly, have a short time at constant speed, then use
brakes and a parachute to come slowly to a stop.
Draw the shape of the speed-time graph for this motion of a dragster.
Graph of Speed vs Time
Acceleration Constant speed Deceleration
during 0 – 10 s 10 -14 s 14-30 s
10s 14s 30 s Stop!
Achieved: 10, or more, A opportunities Final
assessment
Merit: A + 6 M opportunities
Excellence: M + 2E