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

when we consider pure rolling on rough surface there is loss of K.E . the point of contact moves backward relative to the ground therefore friction acts forward , there is displacement of center of mass in the x direction (forward),yet the work done by friction is considered zero why ?????????

when we consider pure rolling on rough surface there is loss of K.E . the point of contact moves backward relative to the ground therefore friction acts forward , there is displacement of center of mass in the x direction (forward),yet the work done by friction is considered zero why ????????? 

Grade:11

4 Answers

Askiitians Expert Soumyajit IIT-Kharagpur
28 Points
11 years ago

Dear Aditya,

Ans:- You have some misconceptions. The force of friction in case of pure rolling acts backward. This actually helps the body to rotate. The workdone against the force of friction is converted into the rotational KE. So in linear motion work done against the force of friction is lost but in the case of the rotational motion tha work done against the force of friction is converted into the rotational kinetic energy.

 

Please feel free to post as many doubts on our discussion forum as you can. If you find any question
Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We
are all IITians and here to help you in your IIT JEE preparation.


All the best Aditya !!!

 


Regards,

Askiitians Experts

SOUMYAJIT IIT_KHARAGPUR

 

aditya prakash morey
18 Points
11 years ago

how can any real force opposite in direction of relative motion help in relative motion. do u mean to say the sphere (RIGID BODY)will not pure roll for ever ?? ur wrong , the friction at the contact point acts forward and helps rolling ... the sphere will roll forever.

aditya gupta
33 Points
8 years ago

for pure rolling the friction acting is zero.

It neither acts in forward direction nor backward unless you have applied some external force.

aditya gupta
33 Points
8 years ago

In case of pure rolling the friction acting is zero.

It neither acts forward nor backward, unless there is some external force acting the body.

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free