do forces always cause motion?

Question

please axplain your answer

Answer 1

No. An example would be if two equal forces oppose each other against a single point mass. The net acceleration is zero; no velocity; no distance travelled; no work done by the mass receiving the forces.

In reality, microscopic motion is the most likely result if one pushes against a wall.

Answer 2

Force does NOT cause motion. Force causes a change in motion, also called acceleration. An object can be moving at a constant velocity (thus in motion) and have no net force acting on it. This is clearly stated in both Newton's first and second laws. An object in motion will stay in a constant state of motion unless acted on by a net external force (Newton's 1st), F = m a (Newton's 2nd).

EDIT

Tinfoil hat is incorrect. Unbalanced forces cause a change in motion (acceleration), not motion by Newton's second law.

James is incorrect. Newton's third law does not entirely apply to this situation. Also his statement "if a force is too small you can't see motion" is invalid. Objects can move at a constant velocity and have no forces acting on them by Newton's first and second laws.

JS is partially correct, but only applies it to the special case of zero velocity. There can be no net force on a moving object as long as that object is at a constant velocity.

Answer 3

Forces always cause motion. Something about Newtons 3rd law. everyaction has an equal and opposite reaction. If the force is too small you wont be able to see the motion

Answer 4

I believe that it does.
It may not be perceptible but even balanced forces will cause a compression of the matter applying the force.
Compression is a form of motion.

Answer 5

No. UNBALANCED forces do, though (using good old F=ma)

For example, I am looking at a pen on my desk. It is at rest. However, Gravity is exerting a force on my pen. My pen is therefore pushing on my desk, and my desk is pushing on my pen. Since these forces are equal and opposite, they 'cancel out, so my pen experiences no acceleration, and remains at rest.