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What is a lever? - Physics

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Question

What is a lever?

One Line Answer

Solution

A lever is a rigid rod that may be bent or straight and rotates around a point; it is known as a FULCRUM.

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Chapter 3: Machines - Exercise 3 (A) 1 [Page 57]

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Selina Physics [English] Class 10 ICSE
Chapter 3 Machines
Exercise 3 (A) 1 | Q 16.1 | Page 57

RELATED QUESTIONS

A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand.

  1. Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions.
  2. State the kind of lever.
  3. Calculate:
    1. load arm,
    2. effort arm,
    3. mechanical advantage and
    4. the effort needed.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long.

  1. To which class does it belong?
  2. Draw a diagram of the lever showing the position of fulcrum F and directions of both the load L and effort E.
  3. What is the mechanical advantage and velocity ratio if the efficiency is 100%?
  4. What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?

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The following belong to which class of lever?

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The following belong to which class of lever?

Human-arm


The following belong to which class of lever?

Sugar tongs


The following belong to which class of lever?

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In the diagram shown alongside a claw hammer, mark the fulcrum (F) and indicate the directions of load (L) and effort (E) with arrows. What class of lever is it? Give one more example of this class of lever.


State the types (or kinds) of lever, and give two examples of each kind.


The length of a nut-cracker is 12 cm. A nut, when kept at a distance of 4 cm from its fulcrum, requires an effort of 100 gf to crack it. What force will be required to crack the nut without using the nut-cracker?


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