Question

What are the effects of force acting on an object?

Answer 1

Hint: Push or pull of a body is considered as force. Push and pull come from the bodies interacting with one another. Terms like stretch and squeeze are also used to denote force. Force applied on a body can change its shape and size.

Complete step by step answer:
The force is defined as an external agent that has the capability to change the state of rest or motion of a particular body. Force is a vector quantity; means that it has both magnitude and direction. The direction in which the force is applied on a body is known as the direction of the force and the application of force is described as the point where the force is applied on the body. The Force can be measured with the help of a spring balance. The SI unit of force is Newton.
The motion is defined as the change in position of a body with respect to time. In simple words, motion refers to the movement of a body. Typically, motion of a body can be described as:
Change in direction
Change in speed
The quantity of force acting on a body is expressed by the vector product of mass and acceleration of the body.
Mathematical expression for the force acting on a body:
$F=ma$
Where,
$m$ is the mass of the body
$a$ is the acceleration of the body
It is expressed in Newton or $Kgm{{s}^{-2}}$
Units of force acting on a body:
SI unit – Newton $\left( N \right)$
CGS unit – Dyne
The Force can create different effects on a body:
Force can make a body that is at rest to move.
Force can stop a moving body or slow it down.
Force can accelerate the speed of a moving body.
Force can change the direction of a moving body along with its shape and size.

Note:
The situation of the net force acting on a body equal to zero is impossible in reality. When the net force on the body is equal to zero, it means that the body cannot gain acceleration. This follows from Newton’s second law of motion. When Force is zero, either mass or acceleration of the body has to be zero. But the mass of a body cannot be zero, so acceleration should be zero. Acceleration is what changes the speed of a body. When there is no acceleration, the body continues to move with the same speed it has before. This speed can take any value including zero. At zero speed, the body remains at rest. So it does not necessarily mean that the object should be at rest when the force acting on it is zero.