Class 9 - Force And Laws Of Motion

Features

• It is the force that enables us to do any work.To do anything, either we pull or push the object. Therefore, pull or push is called force.
• Effect of Force:
• Force can make a stationary body in motion. For example a football can be set to move by kicking it, i.e. by applying a force
• Force can stop a moving body
• Force can change the direction of a moving object.
• Force can change the speed of a moving body
• Force can change the shape and size of an object.
• Forces are mainly of two types:
• Balanced Forces and Unbalanced Forces
• If the resultant of applied forces is equal to zero, it is called balanced forces.
• Balanced forces do not cause any change of state of an object. Balanced forces are equal in magnitude and opposite in direction.
• Balanced forces can change the shape and size of an object. For example - When forces are applied from both sides over a balloon, the size and shape of balloon is changed.
• If the resultant of applied forces are greater than zero the forces are called unbalanced forces. An object in rest can be moved because of applying balanced forces.

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