Force
To change the speed or direction of an object moving at a constant speed, a force must be applied in the opposite direction of its motion to slow it down and a force must be applied in the desired direction of its new path to change its direction. The magnitude and direction of the force will determine how much the speed or direction changes.
To change the speed or direction of an object moving at a constant speed, an external force is required. This force can come from a push, pull, or any other interaction that can accelerate or decelerate the object in a different direction.
Yes, a net force is needed to change the speed or direction of moving matter. Newton's first law of motion states that an object will remain in its state of motion unless acted upon by an external force. When a net force is applied, it can accelerate the object, decelerate it, or change its direction.
You have a velocity when both a speed and a direction is specified. This kind of magnitude is known as a "vector" - that is, when it is relevant to state a direction, as well as a magnitude, we speak about "vectors".
To change the speed of an object, you need to apply a force to it. The magnitude of the force and the direction in which it is applied will determine how the speed changes. If the force is in the same direction as the motion, the object will accelerate; if the force opposes the motion, the object will decelerate.
A force.
Forces can change the speed, direction, or both speed and direction of movement of an object.
Force, which causes acceleration
An outside force to act on it
It doesn't. For example, you can go in a straight line, and speed up or slow down, without changing direction. And if there is both a change in direction and a change in speed, the change of speed wouldn't be the CAUSE for a change in direction. (On the other hand, both can be caused by a force applied to an object.)
Acceleration refers to any change in speed, direction, or both. It can be either an increase or decrease in speed, a change in direction, or a combination of both.
An outside force to act on it