Force - Class 3 Notes & Olympiad Questions

Force

a) A force is similar to a push or a pull that an object can exert on another object.
b) Imagine you have a big ball in front of you. Now, when you push the ball with your hands, you make it move away from you.
c) Similarly, when you pull the ball towards you, you bring it closer. That's an example of using force.
d) Force is like a power that you have to make things move or change their shape.
e) We use force in many activities. When we walk, we use force to push against the ground and move our legs forward. When we lift objects, we use force to pick them up. Even when we throw something, force helps us to make it move through the air.

Effects of Force

Force can cause different things to happen to objects:

a) Force can make an object that's not moving start to move.
b) Force can make an object that's already moving come to a stop.
c) Force can make an object move faster or slower.
d) Force can make an object change the way it's moving, like turning or going in a different direction.
e) Force can even make an object change its shape or size, like squishing it or stretching it.

Types of Force

There are different types of forces that we encounter in our daily lives. Some examples are:

1. Muscular Force

a) Muscular force is the force we create when we use our muscles to push or pull something.
b) It's the force we use when we move our body or lift objects.

2. Magnetic Force

a) Magnetic force is the force that magnets have.
b) It's what makes magnets attract or repel certain objects, like when magnets stick to the refrigerator or push away from each other.

3. Frictional Force

a) Frictional force is the force that happens when two surfaces rub against each other.
b) It's like when you try to slide something on a surface and it feels rough or sticky.
c) Frictional force can slow things down or make them stop.

4. Gravitational Force

a) Gravitational force is the force that pulls everything towards the ground.
b) It's what keeps us on the Earth and makes things fall down when we drop them.
c) It's like the force that keeps our feet on the ground.