the exertion of another force
Well as we can see by Newton's widely unknown fourth law of motion the resulting change in force is caused by a larger in magnitude force blah blah blah do your homework.
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Any amount of force (small or large) applied in a direction non parallel to the
direction of the original force will change its direction.
By the way, making questions to the right people is a way to knowledge.
In order to change direction, the applied force (represented as a Vector) must change DIRECTION. A change in magnitude of the Force is not necessary.
Pulleys change the direction of a force.
The answer is force because Force is needed to change the direction of a moving mass.
Force changes either the speed or the direction of motion, or both.
when it changes its direction
No it does notIt may change direction but obviosly it cannot exert you force
Strictly you should ask whether a force can change the direction a body is moving in. The answer is yes.
If the work that they want to do is not being accomplished, they may want to change the direction of force. They may also want to change the direction of force due to space constraints.
Forces cause motion or the change in motion.
I think this question is not phrased very well. Any force can change objects velocity (speed+direction). If fact that is the definition of the force - F=ma any force, by definition itself, can change objects velocity. Maybe you meant what force can change objects direction of motion? In that case - any force that has a different direction (not the same as direction of motion) Any force can change an object's motion.
Direction
No.