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Exploring Forces in Action

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Exploring Forces in Action

A small trolley must travel safely down a ramp to deliver supplies. Use the science ideas and evidence on this sheet to explain how forces affect its motion. Read each question carefully and write in complete sentences when asked.

Forces at work

A force is a push or pull. Forces can start, stop, speed up, slow down, or change the direction of moving objects.

1.Maia gives the trolley a push. Which statement best describes the push?
  • It is a force that can make the trolley start moving.
  • It is gravity pulling the trolley upwards.
  • It is friction making the trolley speed up.
  • It is a force that only works when objects touch without moving.
2.Match each force with what it does in the trolley mission.
  • Gravity
  • Friction
  • Push
  • Acts between surfaces and resists sliding or rolling
  • A contact force that can set the trolley moving
  • Pulls objects towards Earth
3.As the trolley rolls down the ramp, which force helps pull it downhill?
4.When the trolley reaches the foam block, it slows down and stops. What has the block done to the trolley?

Test the surfaces

Maia starts the same toy trolley from the same point on a ramp. She measures how far it rolls across each surface before stopping. The results are below.

Surface

Distance travelled

Smooth plastic

120 cm

Short carpet

65 cm

Rough mat

30 cm

5.On which surface did the trolley travel the shortest distance?
  • Smooth plastic
  • Short carpet
  • Rough mat
6.Which surface probably had the greatest friction? Use one result from the table as evidence.
7.Complete the idea: Friction between the trolley and a surface usually acts its movement.
8.Maia wants the trolley to roll farther next time. Which change is most likely to help?
  • Use a smoother surface.
  • Use a rougher surface.
  • Place a foam block in its path.
  • Press down harder on the trolley while it rolls.

Explain and predict

Think about how forces help people move and stay safe.

9.True or false? A bicycle needs friction between its tyres and the road to grip the road and turn safely.
TrueFalse
10.A ball rolls across a field and gradually stops. Explain how friction could cause this, and name one place where the friction acts.

3 printable pages

  • Exploring Forces in Action, page 1 of 3: Forces at work

    Page 1

  • Exploring Forces in Action, page 2 of 3: Test the surfaces, Explain and predict

    Page 2

  • Exploring Forces in Action, page 3 of 3: 10. A ball rolls across a field and gradually stops. Explain how friction could cause…

    Page 3

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