MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        which of the following statements is/are correct and why?

(a)the coeficient of static friction may be equal to the coeficient of kinetic friction
(b)the value of coeficient of friction, s can'be greater than one
(c)the value of friction is always costant under moderate conditions
(d)if the surface is rough,the value of static friction can't be zero
10 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
							

dear sanket sit

all answer r correct

Occasionally it is maintained that µ is always < 1, but this is not true.a tire on concrete may have a coefficient of friction of 1.7.

The coefficient of friction is an empirical measurement – it has to be measured experimentally, and cannot be found through calculations. Rougher surfaces tend to have higher effective values. Most dry materials in combination have friction coefficient values between 0.3 and 0.6. Values outside this range are rarer, but teflon, for example, can have a coefficient as low as 0.04

 

The coefficient of kinetic friction is  usually less than the coefficient of static friction for the same materials. In fact, Richard Feynman reports that "with dry metals it is very hard to show any difference." Finally, new models are beginning to show how kinetic friction can be greater than static friction.

 

Regards

Badiuddin

10 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 101 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details