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Explain why mechanical advantage of clas...

Explain why mechanical advantage of class III lever is always less than I.

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Explain why mechanical advantage of a class II lever is always more than 1.

Define mechanical advantage of a lever.

Explain the term mechanical advantage. State its unit.

If the mechanical advantage of a lever is 2.5, what will be the effort you need to apply to lift a load of 50 N?

The diagram below shows a lever in use. (a) To which class of lever does it belong ? Give one example of this class. (b) How will the mechanical advantage of lever change if load is shifted towards the fulcrum without changing it's dimensions.

Calculate the ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm.

Give one example each of a class I lever where mechanical advantage is (a) more than 1, and (b) less than 1.

State one reason why mechanical advantage is less than the velocity ratio for an actual machine.

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ICSE-MACHINES-EXERCISE-3(A)
  1. Both a pair of scissors and a pair of pliers belong to the same class ...

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  2. Explain why scissors for cutting cloth may have blades longer than the...

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  3. Figure, shows a uniform metre rule of weight W supported on a fulcrum ...

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  4. Which typ eof lever has mechanical advantage always more than 1 ? Give...

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  5. Draw a diagram of a lever which is always used as a force multiplier. ...

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  6. Explain why mechanical advantage of a class II lever is always more th...

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  7. Draw a labelled diagram of a class II lever. Give one example of such ...

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  8. Figure, shows a lemon crushes, (a) In the diagram, mark the position...

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  9. The diagram below shows a rod lifting a stone. (a) Mark position of ...

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  10. State the kind of lever which always has mechanical advantage less tha...

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  11. Explain why mechanical advantage of class III lever is always less tha...

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  12. Class III levers have mechanical advantage less than 1. why are they t...

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  13. Draw a labelled sketch of a class III lever. Give one example of this ...

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  14. State the class of levers and the relative positions of load (L), effo...

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  15. Draw diagrams to illustrate the positions of fulcrum, load and effort,...

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  16. Classify the following into levers as class I, class II or class III: ...

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  17. What type of lever is formed by a human body while (a) raising a load ...

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  18. Indicate the positions of load L, effort E and fulcrum F in the forear...

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  19. Give an example of each class of lever in a human body.

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  20. Complete the following sentence: (a) Mechanical advantage=xxvelocity...

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