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Share The friction is acting opposite to the ball rolling in the ground. Friction is a force that resists motion.
It always acts in the opposite direction to the motion. Friction is caused by bumps on the two surfaces whic are in contactrubbing as they slide across each other. Friction means that objects slow down and lose kinetic energy.
This energy does not disappear, but changes into heat.
When someone rubs their hands, they feel warmth. This warmth has been created due to the friction created between the two rubbing hands.
Necessary Evil Edit Friction is sometimes given a name "Necessary Evil" due to its both major advantages and disadvantages without which no motion is possible.
Friction is often called 'the enemy of machines' yet some machines rely on it to work efficiently. A car brake is a good example. Friction also helps the wheels of a vehicle to roll, instead of sliding. A surface without friction is dangerous to walk on as one tends to slide. One good example is of the Ice surface.
Types of Friction Edit This article is a stub. You can help Amazing Science Wiki by expanding it. Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from sliding down a sloped surface.
Kinetic or dynamic friction occurs when two objects are moving relative to each other and rub together like a sled on the ground.
Generally the force of rolling friction is less than that associated with kinetic friction. Fluid friction is the resistance to an object's motion through a liquid or gas. When the motion is occurring in a liquid, it is referred to as viscous resistance.
Resistance to an object moving through a gas, such as air, is termed air friction.Friction a Necessary Evil If there is no friction between any two surfaces in contact, then the present day civilization will be no more- as we cannot even walk properly on the earth. There will be no fabrics and garments, no construction of buildings and no furniture, even no cooking and no vehicles.
r-bridal.comon: A Necessary Evil: Although frictional force is a non-conservative force and causes lots of wastage of energy in the form of heat yet it is very useful to us in many ways. Advantages of Friction i. PowerPoint Presentation: We see that friction is caused by the irregularities in the two surfaces.
It is obvious that the force of friction will increase if two surfaces are pressed harder. We need friction for many things yet friction is also an evil for us.
Therefore FRICTION IS A NECESSARY EVIL!!!!! PowerPoint Presentation: THANK YOU. Why is friction called ‘a necessary evil’?
Ans: We cannot walk, write and drive, without, friction. In certain cases like the motion of machines, wear and tear of machines, loss of energy friction is an ‘evil’. He suggested that evil is something necessary to struggle against so that we may gain moral strengths — just as a weight-lifter needs resistance to develop muscles.
More generally, in the Timaeus he postulated the existence of a cosmic principle, ‘Necessity’, which opposes efforts to impose order on the world.
Necessary Evil Edit. Friction is sometimes given a name "Necessary Evil" due to its both major advantages and disadvantages without which no motion is possible. Friction is often called 'the enemy of machines' yet some machines rely on it to work efficiently.
A car brake is a good example.