NCERT Solutions for Class 4 EVS Chapter 7: How Things Work – Free PDF Download

Chapter 7 of the Class 4 EVS textbook Our Wondrous World is How Things Work. It introduces children to simple machines and mechanisms that make everyday tasks easier.

Simple Machines Around Us

Q: What are some simple machines we use in everyday life?
A: Common simple machines include levers (a seesaw or crowbar), wheels (on a bicycle or cart), pulleys (used to lift a bucket from a well), and inclined planes (a ramp), each making some kind of work easier.

How a Lever Helps

Q: How does a lever make lifting or moving something easier?
A: A lever allows a smaller force applied at one end to lift or move a heavier load at the other end, by pivoting around a fixed point called a fulcrum.

Machines That Combine Parts

Q: Give an example of an everyday object that uses more than one simple machine together.
A: A bicycle is a good example — it uses wheels and axles to move, and gears (a type of wheel mechanism) to change how fast the pedals turn the back wheel.

Frequently Asked Questions

Why do we use simple machines?
Simple machines help us do work with less effort, by changing the amount, direction, or speed of the force we apply.

What is a fulcrum?
A fulcrum is the fixed point around which a lever pivots or turns when force is applied to it.

Written by Satish

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