A lever is a simple machine which we most commonly use in our daily life. In its simplest form, a lever is a rod that can turn about a fixed point called the fulcrum. It can reduce our effort to do work. A nutcracker is an example of a lever. It is difficult to crack a nut using hands. But a nutcracker reduces the effort. Hence, nutcracker is a simple machine.

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 10

EASY

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IMPORTANT

Earn 100

What is an ideal machine ?

Important Questions on Simple Machines

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 11

Can a machine have an efficiency of

100 %

? Give a reason to support your answer.

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 12

'A machine is

75 %

efficient'. What do you understand by this statement ?

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 13

What is a lever?

MEDIUM

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 14

Describe three orders of levers giving an example of each. Draw neat diagrams showing the positions of fulcrum, load and effort in each kind of lever.

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 15

What do you mean by the mechanical advantage of a lever?

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IMPORTANT

Concise Physics Middle School for Class 6>Chapter 4 - Simple Machines>TEST YOURSELF>Q 16

Which class of lever has the mechanical advantage always more than 1 ? Give an example.

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