What do you understand by the terms "balanced forces" and "unbalanced forces"? Explain with examples.
If the resultant of all the forces acting on a body is zero, then forces are called balanced forces. These forces do not change the state of rest or of uniform motion of body but can change the shape of the body.
Example: When we push a concrete wall with our hands the wall doesn't move. This is because the force by us is balanced by the other forces acting on the wall.
If the resultant of all the forces acting on a body is not zero, the forces are called unbalanced forces. These forces change the state of rest or of uniform motion of a body.
Example: If we push a toy car lying on the ground, it starts moving due to the unbalanced force exerted by our hands.