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kinetic frictional
Kinetic
The three forces that causes an object to change its motion are the gravitational force, the normal force and the frictional force.
kinetic frictional
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static
kinetic frictional
The direction of the force of friction is such that it opposes the direction of motion that an object would move if there were no frictional force acting on the object.
Kinetic
Yes, an unbalanced force is needed to change the motion of an object.If an unbalanced force does not act on an object it will continue to maintain its state of motion (either in motion or at rest), not considering the effect of frictional force. This is basically Newtons first law of motion.
Frictional force resists movement. In order to set an object into motion (or accelerate an already moving object), the force of friction must be overcome.
The three forces that causes an object to change its motion are the gravitational force, the normal force and the frictional force.
This frictional resistance known as "air resistance" is the drag force. The drag force changes with the drag coefficient of the object in motion.
Kinetic
Friction is a force that always acts in a direction opposite to that of motion. So the frictional force does negative work on the velocity of an object ( thus reducing the speed of an object).