if a force exerted to pull an ibject, is it the whole force that mekes the object move?

Answer 1

It is the NET force that makes the object move. If you exert 200 pounds of force to lift a 100 pound weight, then the net force is 100 pounds upward (your 200 pound pull upward minus the 100 pound force of gravity downward).

A similar approach applies when there is frictional force. The net force moving an object pushed across a floor is the total pushing force that you apply, minus the opposing force of friction.

In Newton's second law, F = m a, the force is NET (or total) force (both words mean the same here). Net force gives a mass m an acceleration a.

Answer 2

Well, the answer could be yes or no depending upon the conditions under which the force is acting.

If there are no other forces acting on the object other than one force, then the whole force will make the object move.

If, however, there are other forces acting on the object, then several things could happen:
a) Because of the other forces, the force applied may be cancelled by another force or forces. Hence, if ever the object moves, it is not due to the force applied, but due to the unbalanced force attributed to the other forces.
b) The applied force may not be balanced by the other forces and so there will be an unbalanced force acting on the object that will cause it to move.


teddy boy

Answer 3

George S is absolutely correct.

But maybe some clarification is in order to explain how "total" or "whole" force and "net" force can be the same thing.

Force is a vector. Which means it has magnitude |F| and direction, like east or west. Say we have W = 10 pounds force pushing west and E = 5 pounds force pulling east on a block of wood. The total force on that block = T = +W + (-E) = W - E; where west is a plus (+) direction and east is a negative (-) direction. [We could define west to be the negative and east the positive as well. The outcome will be the same. The important thing with vectors is to be consistent in your directions.]

Thus, T = W - E = 10 - 5 = 5 pounds total or whole force acting on the block for our case. But that's also the net force, which is defined as "A net force (also known as a resultant force) is a vector produced when two or more forces act upon a single object." [ See source.] In our case T is the net force, W and E are two forces, and the block of wood is the single object the two forces are acting on.

Answer 4

Objects in motion should be viewed as one with acceleration and with out acceleration.

When a number of forces act on an object, and if the net or resultant force is zero, the object may be at rest or it may also be in uniform motion, i.e. with out acceleration.

If we exert a force to pull an object and there are already some forces other than the one which we apply and if the net force including the one which we do apply is zero.
the object will be at rest or even it may be in uniform motion with constant velocity.

If on the other hand if the net force is not zero the object will move with acceleration in the direction of the net force and it need not be in the direction of the force which we apply to pull the object.