IIT JEE-AIEEE 2012, Entrance Notifications, Study Tips, Engineering Preparation, Practice Test Papers, Experts Advice

Ask iit jee aieee pet cbse icse state board community

Discussion Response Post to: Doubt in physics(laws of motion)

Forum Index -> Mechanics -> View Full Question

Author

Message

Soumen Goswami (2446)

Forum Expert

total posts: 1777
Offline

Let the tension in the string be T.
First we must decide in which direction the frictional force on m₁ will act.
Suppose m₂ moves down. Then
m₂g > T
T>m₁gsin

Which gives
m₂g > m₁gsin

m₂g - m₁gsin

> 0
(2/3)m₁g - m₁g(1/2) > 0
which is true.

Hence the block m₂ moves down. The frictional force on the block m₁ acts down the plane.
m₂g - T = m₂a
T - m₁gsin

m₁gcos

= m₁a
Add these two equations and find the acceleration.

All men dream but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity; but the dreamers of the day are dangerous men, for they may act their dream with open eyes to make it possible.

Like 0 people liked this

Free Sign Up!

Preparing for IIT-JEE ?

Arihant Revision Package for IIT JEE - Books, Practice Tests + Rank Predictor

@ INR 1,995/-

For Quick Info