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Levers

Lesson 3 / 10

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Lesson details

Lesson outcome

Waxaan aqoonsan karaa levers-ka (levers) oo waxaan sharxi karaa ujeeddadooda iyo sida ay u shaqeeyaan.

Introduction

In this lesson: I can identify levers and describe their purpose and how they work. Levers can multiply a small force into a larger force. Levers can multiply a small movement into a larger movement.

Show transcript
Levers can multiply a small force into a larger force. Levers can multiply a small movement into a larger movement. There are different types of lever, each with the pivot in a different position.

Worksheet

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Quizzes

  1. 1. Which of the following act as levers?

    • Correct answer:a wheelbarrow
    • Correct answer:scissors
    • springs
    • ropes
    • Correct answer:a steering wheel

  2. 2. Why is it easier to steer a bicycle with **wide** handlebars rather than one with narrower handlebars?

    • the grips will be better
    • Correct answer:the effort force will be further from the pivot
    • the effort force will be closer from the pivot
    • they are more aerodynamic
    • the pivot is closer to the centre

  3. 3. Why does a spanner acts as a force multiplier?

    • The grip holds the bolt tightly so it does not slip.
    • Correct answer:The effort force is further from the pivot than the load force.
    • The effort force is closer to the pivot than the load force.
    • The handle makes the spanner easy to grip so a large force is produced.

  4. 4. A screwdriver is being used to open a tin of paint. Which statements are correct?

    • Correct answer:The screwdriver is acting as a force multiplier.
    • Correct answer:The load force is very close to the pivot.
    • The effort force is very close to the pivot.
    • Correct answer:The pivot is the edge of the paint tin.
    • The effort and load forces must be equal and opposite.

  1. 1. Where is the pivot on a wheelbarrow?

    • where the soil is placed
    • close to the handle bars
    • at the point where the wheel touches the floor
    • Correct answer:at the centre of the wheel

  2. 2. The figure shows an open door. Which statement is correct?

    • A smaller force is needed to close the door pushing at A instead of B.
    • Correct answer:A smaller force is needed to close the door pushing at B instead of A.
    • The same size force is needed to close the door pushing at A and at B.
    • The door is most easily closed by pushing very close to the hinges.

  3. 3. What term is used for a lever that produces a larger load force than the effort force applied?

    • a force producer
    • a force increaser
    • Correct answer:a force multiplier
    • a force adder

  4. 4. The figure shows a winch used to pull on a rope. The winch is operated by pulling the handle around the pivot in the middle. Which feature make this lever a force multiplier?

    • It rotates easily.
    • Correct answer:The effort force is applied a large distance away from the pivot.
    • The effort force is applied close to the pivot.
    • Correct answer:The load force is produced close to the pivot.
    • The load force is produced a large distance from the the pivot.

  5. 5. How can the load force produced by a crowbar be increased?

    • Correct answer:increasing the effort force
    • Correct answer:increasing the distance from the effort force to the pivot
    • decreasing the distance from the effort force to the pivot
    • increasing the distance from the load force to the pivot
    • Correct answer:decreasing the distance from the load force to the pivot

What pupils see

The same lesson as a pupil sees it. You can set any section as work on its own.

  • IntroductionPrepare
  • Starter quizActivate · 4 questions
  • Lesson videoLearn
  • Exit quizCheck · 5 questions
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