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Answers
Answer:
1
Explanation:
Ans. The two sliding objects find less time to get interlocked against each other (objects and irregularities of surface). So they get less friction. Therefore sliding friction is always less than static friction.
2 Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces
3 Friction can be increased by increasing the roughness of the surfaces in contact.
4 The force required to overcome the friction when trying to set a body at rest in motion is called static friction. Since it is difficult to do that, static friction usually has the highest magnitude. Was this answer helpful?
5 Friction due to fluids is called drag.
6 To sum it up, ball bearings are effective in reducing friction between the moving parts of a machinery by using simple physics: replacing the sliding friction with rolling friction. These improve both the linear or rotational motion around a fixed axis.
7 For instance, when two objects rub together, friction causes some of the energy of motion to be converted into heat. This is why rubbing two sticks together will eventually produce a fire. ... That's why lubricants, or liquids, are often used to reduce the friction — and wear and tear — between moving parts
8 Moving objects in fluid must have special shapes because the drag force or the friction force depends of the shape of the object. Special shapes are designed to minimize the opposing frictional force
9 Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
10 When one body rolls over another body, rolling friction comes into play. Rolling friction is smaller than the sliding friction. In many machines, friction is reduced by using ball bearings.
Answer:
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