9709 P41 - Nov 2019 - Q3
4016
A block of mass 3 kg is at rest on a rough plane inclined at 60° to the horizontal. A force of magnitude 15 N acting up a line of greatest slope of the plane is just sufficient to prevent the block from sliding down the plane.
- Find the coefficient of friction between the block and the plane.
The force of magnitude 15 N is now replaced by a force of magnitude X N acting up the line of greatest slope.
- Find the greatest value of X for which the block does not move.
