Have you ever watched a farmer in a village using a bullock cart? The bullocks pull the cart forward. The farmer pushes the plough into the soil. When you kick a football, you push it with your foot. When you pull open a drawer, you use force too.
Every push or pull is called a force. Force makes things move, stop, or change direction. But where do we get the strength to push or pull? That strength comes from energy. Let us learn about both!
What is Force?
A force is a push or a pull that can make an object move, stop, change direction, or change shape.
You cannot see force, but you can see what it does. When you squeeze a ball of clay, force changes its shape. When you throw a ball, force makes it move.
Types of Force
1. Muscular Force: The force we apply using our muscles. Examples: lifting a bucket of water, pulling a rope during tug-of-war, kneading dough for roti.
2. Gravitational Force: The force that pulls everything towards the Earth. This is why a mango falls down from a tree, not up! It is also called the force of gravity.
3. Magnetic Force: The force a magnet uses to attract objects made of iron. A magnet can pull an iron nail towards it without touching it.
4. Frictional Force: The force that slows down or stops moving objects. When you slide on a rough road, friction stops you. Brakes on a bicycle use friction to stop the wheels.
What is Energy?
Energy is the ability to do work. Without energy, nothing can move, grow, or change. We need energy to walk, talk, cook food, and run machines.
Types of Energy
1. Heat Energy: Energy that makes things warm. A burning stove gives heat energy to cook food. The sun gives us heat.
2. Light Energy: Energy that helps us see. The sun, a lamp, and a candle all give light energy.
3. Sound Energy: Energy that we can hear. A drum, a bell, and a veena all produce sound energy.
4. Electrical Energy: Energy from electricity. It runs fans, lights, televisions, and computers in our homes.
Sources of Energy
The Sun is the biggest source of energy. It gives us heat and light. Food gives energy to our body. Fuel (wood, coal, petrol, LPG gas) gives energy for cooking and running vehicles. Wind and water can also produce energy -- windmills in Rajasthan and dams on rivers produce electricity.
| Word | Meaning |
|---|---|
| Force | A push or pull that changes the state of an object |
| Muscular force | Force applied using muscles of the body |
| Gravity | The force that pulls objects towards the Earth |
| Friction | The force that opposes motion between two surfaces |
| Energy | The ability to do work |
| Fuel | A material that is burned to produce heat or energy |
Finished learning? Now test what you know!