Push or Pull
In physics, force is a push or a pull that changes or tendsto change the state of rest or uniform motion of an object or changes thedirection or shape of an object. Bat changes the direction of the ballBatsman applies some force to change the direction of the ball.
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction. Hence we can say that pushes and pulls are forces. Whenever we are pushing or pulling, lifting or bending, twisting or tearing, stretching or squeezing, we are exerting a force.
i. Opening and closing a door.
ii. A ball being pushed.
iii. A train engine pulling the train coaches.
iv. A spring being stretched.
v. A tooth paste being squeezed.
Effects of force: It is not easy to understand the concept of force, because force cannot be seen; but its effect on objects can be observed and measured. In everyday terms, force can be seen in action when an object is pushed, pulled, stretched or squeezed. We observe that changes in motion like speeding up, slowing down and changing direction are due to the effects of forces.A force can produce the following effects:
1. A force can move or stop a body.
2. A force can change the speed of a body
3. A force can change the direction of a moving body.
4. A force can change the shape or size of a body.