Friction ensures the grip and contact of the hand to the cup. If no friction, you cannot grasp the cup to begin with.

Answer. As a ship moves through the water, the friction of the water acting over the entire wetted surface of the hull causes a net force opposing the ship’s motion.

Explanation: Friction helps a resisting force that is created between the legs and rods to keep the person up. Hence friction plays an important role in the gymnast working with parallel bars.

friction. Snow increases the friction between your shoes and the ground. IIIIIIIIIIIIIIIIIIIIIIIIII Friction is useful in playgrounds.

Writing. Writing with a pencil requires friction. You could not hold a pencil in your hand without friction. Rubbing the eraser on the lead wears out the eraser due to friction, while the particles worn off gather up the pencil lead from the paper.

Friction is just that simple. You will find friction everywhere that objects come into contact with each other. The force acts in the opposite direction to the way an object wants to slide. Less friction means it is harder to stop.

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.

Friction between moving engine parts increases their temperature and causes the parts to wear down. Friction can be both harmful and helpful, so it may be necessary to decrease or increase friction. How can we reduce friction?

The force of friction opposes the motion of an object, causing moving objects to lose energy and slow down. • When objects move through a fluid, such as air or water, the fluid exerts a frictional force on the moving object. The frictional force from a fluid is called a drag force.

By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.

Friction can be reduced by polishing surfaces or using large amount of lubricants such as oil, water, or grease but we cannot reduce friction to zero. We cannot completely eliminate friction.

Friction is a necessary evil which causes a lot of wear and tear in machine parts that move against each other. It erodes the surfaces and destroys their symmetries. Hence, in such cases it is desirable to reduce friction. Friction is reduced by lubricating surfaces to decrease the friction.

The force of friction is always exerted in a direction that opposes movement (for kinetic friction) or potential movement (for static friction) between the two surfaces. For example, a curling stone sliding along the ice experiences a kinetic force slowing it down.

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.

We can walk because of friction between surface and legs. Vehicles move and stop because of the friction of the brakes and the tires. Writing with pen requires friction and also rubbing with an eraser uses friction. Airplanes can fly and move in the air because of friction in the air called drag or air resistance.

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil .

Cars having streamlined shape give better mileage because the streamlined shape of an object moving through a fluid reduces friction. Their streamlined shape helps them move through easily and less amount of fuel is wasted to overcome friction.

Answer:

1. Friction can be reduced by making the surface smooth by polishing.
2. Friction can be reduced by applying lubricants (like oil or grease) to the rubbing surface.
3. Friction can be reduced by using wheels to move objects.
4. Friction can be reduced by using ball bearing between the moving parts of machine.