wiz-icon
MyQuestionIcon
MyQuestionIcon
3
You visited us 3 times! Enjoying our articles? Unlock Full Access!
Question

A rought vertical board has an acceleration a, so that a 2 kg block pressing against it does not fall. The coefficient of friction between the block and the board is μ, then


A
μ>ag
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
μ<ga
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
μ<ag
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
μ>ga
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D μ>ga
By the free body diagram of the block,

The wall presses the block and so the reaction force towards left is R and the pseudo force on the block will be towards right as ma

The frictional force (f) here will prevent the block from falling

By the equilibrium condition, balancing the forces in vertical direction we get,

f>mg , where f=μR
μ(R)>mg
μ(ma)>mg
μ>ga

Hence, option D is the correct answer

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Friction: A Quantitative Picture
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon