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Question
Which class of lever found in the human body is being used by a boy when he holds a load on the palm of his hand.
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Solution
Class III lever.
RELATED QUESTIONS
Write down a relation expressing the mechanical advantage of a lever.
Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever?
Class II levers are designed to have ______.
Fig 3.17 below shows a lever in use.
(a) To which class of lever does it belong?
(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.
(c) Calculate the value of E.
A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long.
- To which class does it belong?
- Draw a diagram of the lever showing the position of fulcrum F and directions of both the load L and effort E.
- What is the mechanical advantage and velocity ratio if the efficiency is 100%?
- What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?
Which type of levers have mechanical advantage always more than 1? Give reasons.
Give three examples for leavers of the third order.
The following belong to which class of lever?
Human-arm
The following belong to which class of lever?
Fore-arm
When we want to use a machine as a force multiplier, which class of lever should we preferably use? Give a simple diagram of such a lever.
