Sat August 20, 2011 By: Aditi Sharma

if the resultant of all forces acting on a body is zero in the case of balanced forces,then why it is said that the forces acting on a lift moving downwards with uniform motion are balanced?

Expert Reply
Tue August 30, 2011
For a lift moving downwards with uniform motion, acceleration is zero.
Force = mass x acceleration
So, force is also zero.
If an object has zero acceleration we must conclude that there is no resultant force acting on it.
So a lift moves with uniform motion even if the forces acting on it are balanced.
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