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Understanding Forces!

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Understanding Forces!

Read the competition scenario and use your science knowledge to investigate how forces affect movement. Answer the questions using the written scenario and your science knowledge.

The competition

Nikau and Hana are performing at a dance competition. Nikau pushes against the floor to leap into the air. While he is airborne, gravity pulls him downwards. When Hana slides to a stop, friction between her shoes and the floor slows her movement. The dancers also use their muscles to push and pull their bodies into different positions.

1.According to the scenario, identify the force that pulls Nikau towards Earth and the force from the floor that helps launch him upwards.
2.Classify each force as a contact force or a non-contact force: (a) friction between Hana’s shoes and the floor; (b) gravity pulling Nikau down; (c) the floor pushing on Nikau as he jumps; (d) a magnet pulling an iron clip without touching it.
3.Hana slides across the stage and gradually slows down. Which force most directly causes her to slow?
  • Gravity
  • Friction
  • Magnetism
  • Air pressure only
4.A stage prop remains still on the floor. Gravity pulls it down while the floor pushes it up with an equal-sized force. Are the forces balanced or unbalanced? What happens to the prop’s motion?
5.When Nikau is in the air, gravity stops acting on him because he is no longer touching the floor.
TrueFalse
6.A force can change an object’s speed, direction or . A force is a push or a .
7.Match each situation to the force that best explains it.
  • A shoe grips the stage instead of sliding
  • A dropped hair clip falls towards the floor
  • A dancer pushes a door open
  • Gravity
  • Friction
  • Applied push
8.The stage manager places a smooth mat over a rough section of floor. Hana slides across the mat. Compared with the rough floor, will friction be greater or smaller, and how will this affect her slide?
9.Explain how forces help Nikau jump and then return to the floor. Include the floor’s push, gravity and what happens to his movement while he is airborne.

2 printable pages

  • Understanding Forces!, page 1 of 2: The competition

    Page 1

  • Understanding Forces!, page 2 of 2: 4. A stage prop remains still on the floor. Gravity pulls it down while the floor pushes…

    Page 2

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