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Question

a small block of mass m is kept on a rough inclined surface of inclination o * fixed in an elevator the elevator goes up with a uniform velocity v &block doesn't slide on the wedge the w.d by the force of fricition on block in t time is?

ANS) mgtsin²o*

Joshi sir comment

work done by the force of fricition on block in t time = fvtcos(90-θ) = mgsinθvtsinθ

Read 3 Solution.

the answer is dimensionaly incorrect.

draw the FBD . u will get f =mg sinθ now break f into perpendicular components.

here fsinθ will act in downward drtn. and f cosθ in a direction perpendicular to motion.

so the work will be done by f sinθ.

work done=mgsin²θ * h

h = height travelled in time t

NIKHIL VARSHNEY 12 year ago is this solution helpfull: 17 20

PARDON , THE ANS IS mgvtsin²o

SARIKA 12 year ago is this solution helpfull: 11 13

take h = vt

NIKHIL VARSHNEY 12 year ago is this solution helpfull: 7 8

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