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Land Waka Forces Cloze

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Land Waka Forces Cloze

Talia, Anahera and Finn are testing a small land waka near a lighthouse. Read the science story and use its clues to complete Questions 1–8. Then use your understanding of forces to answer Questions 9–10.

Read the science story

Before the fan was switched on, the land waka was still. Its weight pulled down, while the floor pushed up with an equal force. These forces kept it at rest. When the fan sent air backwards, the air pushed the waka forwards. This forward push has a special name. The forces were no longer equal, so the waka’s motion began to increase. A stronger push can produce a greater increase in motion if the waka’s mass stays the same. As it rolled, the contact between its wheels and the floor, along with the force from the surrounding air, acted against its motion. When the fan was angled to one side, the waka travelled in a different direction. The waka’s speed and direction together describe its velocity. The fan also moved air backwards as the waka moved forwards: the waka and air exerted equal and opposite forces on each other.

Clues

Use the descriptions in the story to identify the science terms that complete the sentences.

1.Before the fan was switched on, equal forces kept the waka still. These are called .
2.The fan’s forward push on the waka is called .
3.Once the fan pushed the waka, the forces became .
4.The waka began to when the forces were no longer equal and its motion started to increase.
5.The force between the waka’s wheels and the floor that acts against motion is .
6.The force from the air acting against the moving waka is .
7.The waka’s speed and direction together describe its .
8.Angling the fan caused the waka to .
9.Finn keeps the waka the same but uses a stronger fan push. What is most likely to happen?
  • It will accelerate more.
  • It will become heavier.
  • Friction will disappear.
10.Explain how the waka and the moving air show equal and opposite forces.

2 printable pages

  • Land Waka Forces Cloze, page 1 of 2: Read the science story, Clues

    Page 1

  • Land Waka Forces Cloze, page 2 of 2: 9. Finn keeps the waka the same but uses a stronger fan push. What is most likely to…

    Page 2

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