Class 4 Evs - KERALA
How Things Work
The chapter 'How Things Work' in the Class 4 EVS textbook 'Our Wondrous World' introduces Kerala students to the fascinating world of machines, tools, and everyday science. Learners explore how simple machines like pulleys, levers, and inclined planes make our daily work easier and faster. This chapter helps children observe their surroundings, understand the working principles of common household appliances, and appreciate the role of technology and human effort in solving everyday problems. In the Kerala SCERT board exams, questions from this chapter test observational skills and practical understanding, carrying around 5 to 8 marks.
Start Learning FreeKey Concepts
Simple Machines
Basic tools with few or no moving parts that make work easier by changing the direction or strength of a force.
The Lever
A rigid bar that rests on a pivot (fulcrum) to help lift or move heavy loads with less effort, like a seesaw or scissors.
The Pulley
A wheel with a grooved rim and a rope used to lift heavy objects easily, commonly seen on drawing water from a well.
Inclined Plane
A flat sloping surface used to move heavy objects up or down to a higher or lower level with less effort, like a ramp.
Work and Energy
Work is done when an object moves using force, and energy is the ability to do that work using food, electricity, or fuel.
Important Formulas
Board Exam Info
This chapter typically carries about 5 to 8 marks in the Kerala (SCERT) Class 4 EVS examinations. Common question types include identifying simple machines from pictures, filling in the blanks, matching tools to their uses, and short descriptive questions about how everyday appliances or tools help us.
Frequently Asked Questions
What is a simple machine?
A simple machine is a basic tool that helps us do work faster and with less effort, such as scissors, ramps, and pulleys.
How does a pulley help us get water from a well?
A pulley uses a wheel and a rope to change the direction of the force, making it much easier to pull heavy buckets of water up.
Are all machines electronic?
No, many machines are simple and do not need electricity, such as a broom, a bottle opener, or a hand pump.
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