मराठी

Which Class of Lever Will Always Have Ma > 1 and Why? - Physics

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प्रश्न

Which class of lever will always have MA > 1 and why?

उत्तर

A Class II lever will always have MA > 1. This is because the load is between the fulcrum and the effort. So, the effort arm is always greater than the load arm. Hence, MA = E/L > 1.

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2016-2017 (March) Set 1

संबंधित प्रश्‍न

The diagram below shows a lever in use:

  1. To which class of levers does it belong?
  2. Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever?

Give one example of a class I lever where mechanical advantage is more than one ?


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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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Draw a labelled sketch of a second class lever. Give one example of such a lever.


In the following diagram of a wheelbarrow, 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 the same class of lever.


The diagram shows the use of a lever.

  1. State the principle of moments as applied to the above lever.
  2. Which class of lever is this? Give an example of this class of lever.
  3. If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.

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