Question

what is force? what are the four main effects of force?

Answer 1

a force is any interaction that, when unopposed, will change the motion of an object.

Effects of Force

A force can produce the following effects on an Object:

1) A force can move a stationary object: An Object remains at rest would begin to move when a force is applied to it. E.g.: A Football remains stationary on the ground until it is been kicked by a player.

2) A force can stop a moving object: An Object which is in motion either constant/varying could be stopped when a force is applied to it. E.g.: Application of brakes on a car in motion.

3) A force can change the speed of a moving object: An Object which is in motion either constant/varying, if a force is applied to the object in the same direction of the motion or opposite would change the speed of the object. E.g.: In bicycle pedaling faster would make the bicycle go faster and vice versa.

4) A force can change the direction of a moving object: An Objects’ direction either stationary or in motion is changed when force is applied. E.g.: Application of force on car steering makes the change in direction of the car's motion.

5) A force can change the shape and size of an object: When a force is applied on an object, based on its structural strength and amount of force applied, its shape or size could be changed/deformed. E.g.: Application of force on a clay or hitting aluminum sheet with a hammer makes the object's shape transformation.

Answer 2

a push or pull acting ob a body which leads to change in motion, shape , size etc. is called force
Effects are
Change in direction
Change in speed
change of size and shape
and change in motion