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Introduction to Forces

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Introduction to Forces

Explore the forces at work on a playground. Read the mini-story, then solve each challenge. A force is a push or pull; forces can change an object’s motion or shape.

The playground investigation

At lunchtime, Maia rolls a ball across the court. It gradually slows and stops. She pushes a swing, which moves forwards and backwards. Nearby, a friend pulls a wagon carrying sports gear. When Maia lets go of a dropped beanbag, it falls to the ground. On the grass, the beanbag stops more quickly than the ball did on the smooth court.

Spot the forces

1.Which statement best describes a force?
  • A kind of material objects are made from
  • A push or pull that can affect an object
  • A sound made when an object moves
  • A measure of how colourful an object is
2.In the story, name one action that is a push and one action that is a pull. Explain what happens to each object.
3.When the ball slows down on the court, which force is mainly opposing its motion?
  • Friction between the ball and the ground
  • Gravity pulling the ball sideways
  • A push from the air behind the ball
  • Magnetism from the court
4.Complete the sentence: When Maia lets go of the beanbag, pulls it towards the ground.
5.True or false? Friction can make a moving object slow down or stop.
TrueFalse

Follow the motion

6.A toy cart is rolling to the right. Show its direction of travel on the number line. Then mark the direction friction acts on the cart.
-2-1012
7.A squash ball is squeezed between two hands. What is one change a force could cause in this situation?
8.Why might the beanbag stop more quickly on grass than the ball stops on the smooth court?

Be a force detective

9.Choose one playground action from the story. Describe how you could investigate whether a different surface changes how quickly an object stops. Include what you would keep the same and what you would observe.
10.Select all the statements that are correct.
  • A force can start or stop an object’s motion.
  • Gravity pulls objects towards Earth.
  • Friction always makes objects move faster.
  • A force can change an object’s direction or shape.
11.Imagine the playground had no gravity for a moment. Describe one surprising change you might notice and why it would happen.

3 printable pages

  • Introduction to Forces, page 1 of 3: The playground investigation, Spot the forces

    Page 1

  • Introduction to Forces, page 2 of 3: Follow the motion, Be a force detective

    Page 2

  • Introduction to Forces, page 3 of 3: 10. Select all the statements that are correct.

    Page 3

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