Effects of force Describe effects of a force acting on a body.
As you have started this discussion in the Physics group, we should look at the effects of a force on a body from the relevant point of view.
Force is equal to mass*acceleration
Whenever a force acts on a body the body is accelerated in the direction of the force by a value inversely proportional to the mass.
Or acceleration = force / mass.
The acceleration may be too small to be noticeable but there is no denying that there is one.
Also, there is no acceleration when there is a counter-acting force which is equal to the force applied.
It is also true that a force can act on a body without any visible effect. For example, when a boulder rests on the ground, gravity is acting upon it but no effect is seen because the normal force is also acting on it to keep it in equilibrium.
Sometimes, a force can act on an object but be too small to change anything about that body. An example would be a grasshopper jumping off that boulder -- it would exert force but the force would be too small to overcome the other forces acting on the boulder.
For instance, a force can change the kinematics of a body (a force can stop or move a body, changing the speed of the body, by increasing or decreasing it, or th force can change the direction of motion of that body).
Also, a force can change the original shape and size of a body.
As conclusion, any kind of action, of pull or push type, that has as result the changing of velocity of the body, is called force.