Yes, force is necessary to change any motion of an object. The force can, for example be gravity or friction. Without these two factors, an object would continue moving in its original velocity (speed and direction) in eternity.
A basic physics answer for this is that a net force (or unbalanced force) will cause an object to accelerate, that is, cause the object to change its speed and/or direction.
An unbalanced force
Force. Change in speed and direction is change in velocity. Change is velocity is called acceleration a=F/m.. The amount of change is the amount of acceleration and that depends inversely on the mass and directly on the force.
Force changes either the speed or the direction of motion, or both.
A moving body can be accelerated by applying a force. This force will act to increase velocity, decrease velocity or change the direction the body is moving. All three of these are acceleration.
Force
A basic physics answer for this is that a net force (or unbalanced force) will cause an object to accelerate, that is, cause the object to change its speed and/or direction.
A change in speed or direction is caused by a force and is called acceleration.
Gravitational Force
An unbalanced force
If you exert a force on an object in motion you will change its velocity, velocity being a vector quantity of speed and direction.
Force. Change in speed and direction is change in velocity. Change is velocity is called acceleration a=F/m.. The amount of change is the amount of acceleration and that depends inversely on the mass and directly on the force.
It can change its speed or direction.
change direction, change speed, and change force
yes, because force is a push or pull, so an example would be that wind (the force) pushed the bike faster toward a building and steered the bike around the building, which causes the bike to change direction. This is an example of velocity too. Velocity is speed in a specific direction.
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.)
None.