badge image

Enroll For Free Now & Improve Your Performance.

×
User Icon
User Icon
User Icon
User Icon
User Icon

Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
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: 12th Pass

                        

a ball with mass m strikes a rough vertical wall with an angle of 37 degress ( along the common normal)and rebounds with the same angle. Find the coefficient of friction

7 years ago

Answers : (2)

arnab adhikary
16 Points
							

0.25

7 years ago
Arpit Jaiswal
31 Points
							

I guess u meant coefficient of restitution, by coefficient of friction!!

First we should know that coefficient of restitution, e= relative speed of seperation  = RSS/RSA

         relative speed of approach

(Wish i could help you with the visuals but i don''t know how to)

Never mind, lets continue this way..

before collision

let the ball fall at angle of 37degree, with the normal, then dividing the velocity into components we have-

vsin37 along verticall downward, direction is -j^, and

vcos37  along horizontal towards the wall, i.e direction along -i^

 

after collision

let the velocity be u, alog vertically downward it is     usin37 -j^

and along horizontal it is ucos37 +i^

 

Now vertical velocity is not affect during collision, because only horizontal velocity takes part in collision.

therefore, usin37=vsin37

or, u=v

therefore horizontal velocity after collision is,      vcos37

applying very first formulae, we have e= RSS/RSA 

or, e=vcos37/vco37=1

therefore, we can say collision is perfectly elastic.

 

 

Now we have a shortcut also, when we have angles of collision and refelection, that might help (:D)-

e=tanΘ1/tanΘ2

here tanΘ1 is intial angle and tanΘ2 isfinal angle..

hope this helps :D

AJ

(Hope you liked this, if  yes then please vote this answer ;))

 

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


Course Features

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


Course Features

  • 731 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