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What is the purpose of a jack in lifting a cary by it?

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ICSE-MACHINES-EXERCISE-3(A)
  1. State four ways in which machines are useful to us.

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  2. Name a machine for each of the following use : (a) to multiple the f...

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  3. What is the purpose of a jack in lifting a cary by it?

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  4. What do you understand by an ideal machine ? How does it differ from a...

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  5. Explain the term mechanical advantage. State its unit.

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  6. Define the term velocity ratio. State its unit.

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  7. How is mechanical advantage related to velocity ratio for (i) an ideal...

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  8. Define the term efficiency of a machine. Give two reasons for a machin...

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  9. When does a machine act as (a) a force multiplier, (b) a speed multipl...

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  10. A machine works as a (i) force multiplier, (ii) speed multiplier. In e...

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  11. (a) State the relationship between mechanical advantage, velocity rati...

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  12. Derive a relationship between mechanical advantage, velocity ratio and...

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  13. How is mechanical advantage related with velocity ratio for an actual ...

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  14. State one reason why mechanical advantage is less than the velocity ra...

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  15. What is a lever ? State its principle.

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  16. Write down a relation expressing the mechanical advantage of a lever.

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  17. Name the three classes of levers and state how are they distinguished....

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  18. Give one example each of a class I lever where mechanical advantage is...

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  19. What is the use of a lever if its mechanical advantage is (a) more tha...

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  20. Both a pair of scissors and a pair of pliers belong to the same class ...

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