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Balanced and unbalanced forces

When the resultant (net) force on a body is zero, the forces on the body are said to be balanced.

There is no acceleration when the forces on a body are balanced. If the body is at rest it remains at rest. If the body is moving it will move with constant velocity.

A stationary trolley that is pushed by two people with the same force in opposite directions will not move as the forces are balanced.

When the net force on a body is non-zero, the forces on the body are said to be unbalanced.

There will be acceleration in the direction of the resultant force.

A plane that is pushed north by its engines and east by the wind will move northeast.

Balanced forces (left) and unbalanced forces (right) acting on two objects.
Balanced forces (left) and unbalanced forces (right) acting on two objects.