Force and Laws Of Motion-Class 9 -Science-Balanced & Unbalanced Force- Tamil Explanation

Опубликовано: 22 Июнь 2025
на канале: English Abaca

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Chapter Notes for Class 9 Science Chapter – 9 Force and Laws Of Motion

Introduction of force
As you all are familiar that if we want to open a door, we have to push the door handle. Similarly, when we want to close it, we have to pull it. This shows that in order to move the body we need to push or pull. This push or pull is called force. Likewise, if we need to hammer a nail in wood, we have to strike the hammer on nail with great strength.

So, combining both we can sum up that: The Pushing and Pulling or the Strength is force. We can define it in a technical language as – An external influence which when applied on a body can bring about changes in it.

kicking of football
The following changes can be brought about in a body:

Change in Position, Like: Kicking of Football

Change in Direction, Like: Applying Force on steering wheel of car

Change in Dimension, Squeezing a tube of toothpaste

Change in Speed of body, Accelerating a Car

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Types of forces – Balanced and unbalanced forces
We have two Types of Forces depending upon whether the effect of force is seen or felt or not . That is:

Balanced force
Unbalanced force
Balanced Force : The equal and opposite force acting on a body, which will not make the body move.

For example: If we have a box, and in order to move it, we apply force. Let’s say, the same force is acting on an object from opposite sides. Then both forces will cancel each other’s effect as their magnitude is the same and both are acting from opposite sides. So, the resultant force will be zero.

Unbalanced Force: The unequal and opposite force acting on the body, which will make the body move in the direction of greater force applied.

For example: If we have a box, and in order to move it, we need to apply a force. Let’s say, the force of unequal magnitude is acting on an object from opposite sides. This time both the forces will not cancel each other effect as their magnitude is not the same. So, the resultant force will not be zero and will also make the body move in the direction of greater force applied.

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