Define angle of friction and What are the methods of reducing friction .
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Angle of friction is a way to measure the friction between two surfaces. One body in placed on another body (surface) and one of the bodies (usually the flat surface) is made to incline with respect to ground letting gravity work over the first body (placed over the flat surface i.e., over the second body) then the maximum angle of inclination at which the firstbody may remain stable is measured , that angle is called angle of friction and the tangent of that angle is called called coefficient of friction !
Reducing friction
It is beneficial to reduce the friction between surfaces to make movement easier or reduce the wear and tear on a surface. There are a number of ways to reduce friction:
Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction. Some swimmers wear suits to reduce underwater resistance. These suits mimic the smooth skin of sharks.
Lubrication is another way to make a surface smoother. A lubricant is a slippery substance designed to reduce the friction between surfaces. You might use oil to stop a door from squeaking - the oil reduces the friction in the hinge. Water can be used as a lubricant - think of how a floor becomes slippery after it has been mopped.
Make the object more streamlined. A streamline shape is one that allows air or water to flow around it easily, offering the least resistance. Compare a boxy old car with a new car that has a rounded shape, allowing it to move with less effort.
Reduce the forces acting on the surfaces. The stronger the forces acting on the surfaces, the higher the friction, so reducing the forces would reduce the friction. If you apply the handbrake when you try to drive a car, the car will have a lot of difficulty moving because of the force immobilising (stopping the movement of) the wheels. If you release the handbrake, the wheels will move more freely because there is no extra force acting on them.
Reduce the contact between the surfaces. Have you ever tried to roll a cube? Spheres are the best shape for reducing friction because very little of a spherical object is in contact with the other surface. Several types of wheels, such as skateboard wheels, contain small spheres called ball bearings to reduce the friction between the moving parts. You can witness the effect of ball bearings by comparing the friction between sliding a book on a table and then doing the same, but using marbles between the book and the surface of the table. Notice how the marbles act as ball bearings, reducing the friction.
Reducing friction
It is beneficial to reduce the friction between surfaces to make movement easier or reduce the wear and tear on a surface. There are a number of ways to reduce friction:
Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction. Some swimmers wear suits to reduce underwater resistance. These suits mimic the smooth skin of sharks.
Lubrication is another way to make a surface smoother. A lubricant is a slippery substance designed to reduce the friction between surfaces. You might use oil to stop a door from squeaking - the oil reduces the friction in the hinge. Water can be used as a lubricant - think of how a floor becomes slippery after it has been mopped.
Make the object more streamlined. A streamline shape is one that allows air or water to flow around it easily, offering the least resistance. Compare a boxy old car with a new car that has a rounded shape, allowing it to move with less effort.
Reduce the forces acting on the surfaces. The stronger the forces acting on the surfaces, the higher the friction, so reducing the forces would reduce the friction. If you apply the handbrake when you try to drive a car, the car will have a lot of difficulty moving because of the force immobilising (stopping the movement of) the wheels. If you release the handbrake, the wheels will move more freely because there is no extra force acting on them.
Reduce the contact between the surfaces. Have you ever tried to roll a cube? Spheres are the best shape for reducing friction because very little of a spherical object is in contact with the other surface. Several types of wheels, such as skateboard wheels, contain small spheres called ball bearings to reduce the friction between the moving parts. You can witness the effect of ball bearings by comparing the friction between sliding a book on a table and then doing the same, but using marbles between the book and the surface of the table. Notice how the marbles act as ball bearings, reducing the friction.
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◾Answer
⚫ Angle Of Friction
◾It is the angle between the normal drawn to the surface and the resultant of normal friction and limiting friction.
⚫Methods of Reducing Friction
◾Friction can be reduced by polishing.
◾Friction can be reduced by using ball bearings.
◾Friction can be reduced by lubrication.
◾Friction can be reduced by streamlining.
◾Friction can be reduced by maintaining cushion of air between solid surfaces.
◾◾Be Brainly ◾◾
⚫ Angle Of Friction
◾It is the angle between the normal drawn to the surface and the resultant of normal friction and limiting friction.
⚫Methods of Reducing Friction
◾Friction can be reduced by polishing.
◾Friction can be reduced by using ball bearings.
◾Friction can be reduced by lubrication.
◾Friction can be reduced by streamlining.
◾Friction can be reduced by maintaining cushion of air between solid surfaces.
◾◾Be Brainly ◾◾
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