Methods of Increasing and Reducing Friction For example, treading of shoes and tires is done to increase friction. When friction is undesirable we have to reduce the friction. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts.
Q. What is the basic principle for increasing friction?
The basic principle for increasing friction is by increasing the roughness of the surfaces in contact.
Table of Contents
- Q. What is the basic principle for increasing friction?
- Q. What is principle of friction?
- Q. How do you increase or decrease friction?
- Q. Why is rolling friction less than sliding?
- Q. Why do we need to increase or decrease friction?
- Q. How does Banking reduce friction?
- Q. Why bank tracks are needed for turns?
Q. What is principle of friction?
1) The force of friction always acts in a direction, opposite to that in which the body tends to move, if the force of friction would have been absent. 2) The magnitude of the force of friction is exactly equal to the force which tends to move the body.
Q. How do you increase or decrease friction?
What are the methods of reducing friction ? Explain
- By using lubricants: friction increases as the roughness of the surface increases.
- Polishing surfaces: It makes the surfaces even and hence reduces friction.
- By using ball bearings: Rotating machines can be mounted on ball bearings.
- By streamlining: streamlining reduces the area of contact and thus reduces friction.
Q. Why is rolling friction less than sliding?
The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.
Q. Why do we need to increase or decrease 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.
Q. How does Banking reduce friction?
In simple terms, the system of raising the outer edge of a curved road above the inner edge is called banking of roads. The banking of roads is a good way to lessen the wear and tear caused due to friction as the horizontal component of normal reaction gives the necessary centripetal force, hence lessens friction.
Q. Why bank tracks are needed for turns?
If the road is banked, so that the outer edge is above the inner edge, then a portion of the normal force from the road on the tires points towards the center of the track; this fraction of the normal force can provide enough centripetal force to keep the car moving in a circle.
