Class 4 Evs - CBSE
How Things Work
The chapter 'How Things Work' in Class 4 EVS (Our Wondrous World) introduces students to the fascinating world of machines, tools, and everyday objects that make our lives easier. Young learners explore simple machines like levers, pulleys, and inclined planes, and understand how energy makes things move. This chapter builds a strong foundational understanding of basic physics and mechanics, encouraging curiosity about how household items function. For CBSE board exams, questions from this chapter test observational skills and the ability to link daily life experiences with scientific concepts, usually contributing 5-8 marks in the term assessments.
Start Learning FreeKey Concepts
Simple Machines
Basic tools like levers, pulleys, and wheels that make our work easier by changing the direction or amount of force needed.
Force
A push or pull applied on an object that can make it move, stop, change speed, or change shape.
Energy
The ability to do work or cause a change; we get energy from food, and machines get energy from electricity, fuel, or the sun.
Levers
A rigid bar that pivots on a fixed point called a fulcrum, used to lift heavy loads with less effort like a seesaw or scissors.
Friction
A force that slows down or stops objects when they rub against each other, such as tires on a road.
Important Formulas
Board Exam Info
In CBSE Class 4 EVS, this chapter typically carries about 5 to 8 marks. Common question types include matching simple machines to their examples, filling in the blanks about force and energy, short-answer questions explaining how daily tools work, and diagram-based identification of levers or pulleys.
Frequently Asked Questions
What is the difference between a push and a pull?
A push moves an object away from you, while a pull brings an object closer to you.
Are simple machines only found in factories?
No! Simple machines are all around us at home, such as doorknobs (wheel and axle), knives (wedge), and ramps (inclined plane).
Why do we need friction?
Friction is very important because it prevents us from slipping when we walk and helps car tires grip the road so they can stop safely.
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