Question

Objects change their state of motion due to the net force acting on them. Discuss with example.

Accepted Answer

Pushing the table in the same direction, as shown in the figure. The force applied by one person added to the force exerted by another person results in both forces being applied on the table in the same direction. The total force applied by both persons made it easy to move the table.

Now ask one person to push the table from the opposite side as shown in figure.
When a person and another person push the table from opposite sides, the table doesn't move if both persons apply force with equal magnitude.
All forces have both magnitude and direction. While adding forces, the directions of forces have to be taken into account. When forces act on a body along a straight line, and they are in the same direction, the net force is taken as the sum of all forces acting on the body. To add forces, a sign convention must be used.
$\overset{F_{1}}{\to}$ $\overset{F_{2}}{\leftarrow}$
As shown in the above figure, the force F1 directed towards right could be taken as positive and the force F2 acting towards left could be taken as negative. Let the forces F1 and F2 act on the table in opposite direction as shown in the figure and F1 greater than F2,
Then $F_{n e t} = F_{1} - (- F_{2}) = F_{1} + F_{2}$
When the forces on a body in a straight line are in opposite directions, the net force is equal to the difference between the forces. The object at rest moves in the direction of the net force acting on it.
If the net force is equal to zero, then the body will be at rest.

Objects change their state of motion due to the net force acting on them. Discuss with example.

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