Question

The taxi driver has to be more careful when driving a car in winter because of morning dew. That means the friction on the road during winter is _______ friction.
(A) More than
(B) Less than
(C) Same as
(D) Having no relation with friction

Answer 1

Hint: We should know that since friction is a resistive force that slows down or prevents motion, it can be a nuisance, because it can hinder motion and cause the need for expending extra energy. Friction can also cause parts in contact to heat up and can cause parts in contact to wear out. Friction is important also for these reasons: (1) It causes air in the PBL to converge toward low pressure and diverge from high pressure (friction causes PBL air to flow toward low pressure) (2) friction is a little stronger over land surfaces than over water surfaces since land surfaces have a rougher and more vertical.

Complete step-by step answer:
We should know that friction is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when we try to push a book along the floor, friction makes this difficult. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move.
When an object is moving, the friction is proportional and perpendicular to the normal force (N) Friction is independent of the area of contact so long as there is an area of contact. The coefficient of static friction is slightly greater than the coefficient of kinetic friction.
A moving car moves forward due to friction and also can be controlled on the road due to friction. In winter, due to morning dew, friction decreases and the driver has to be careful. Due to the presence of dew, friction in winter is less than in summer.

Hence, the correct answer is Option B.

Note: We should know that a good part of friction is it helps us move about without falling all the time. Friction can create heat and help us make campfires, lighting up a match. That is the good part of friction. Friction provides required energy, converting from mechanical to other forms of useful energy. Friction stops things from sliding apart. If there was no friction everything would slide to the lowest point. It would be impossible to climb up anything. With no friction the only possible movement would be falling to a lower point under gravity. Coefficient of friction is defined as the ratio of the force required to move two sliding surfaces over each other, and the force holding them together.
It should be known to us that static friction is a force that keeps an object at rest. Static friction definition can be written as the friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface which it is on.