define frictional force give two examples where friction is necessary. (answer me please fast)
Answers
Answer:
Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out.
Explanation:
The wheels of an automobile move because of its friction with the ground. Without the friction, the wheels would slip and won't be able to move properly. We walk properly because of the shoe soles causing friction with the ground. If the soles wouldn't create friction, we would fall or slip while walking.
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Answer:
The force that opposes the motion of object is called a frictional force.It always acts in a direction opposite to that of motion.
As in bicycle , there is a brake to decrease the speed of cycle.Tyres of vehicles are rough that enables the vehicles to move safely.
In first case , we apply a frictional force to slow down or stops a moving cycle.It means, here force works against the motion of bicycle.So, the speed of cycle become slow.