A block rests on a smooth plane that is inclined at to the horizontal
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A 5kg block rests on a smooth plane that is inclined at 30∘ to the horizontal. A light string attached to the block is pulled vertically upward with a constant force of 20N.
(a) Calculate the normal reaction exerted by the plane on the block when the string is slack (no upward pull).
(b) Determine the new normal reaction when the 20N upward pull is applied.
(c) Comment on how the apparent weight of the block changes between the two situations.