- #1

Ulti

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## Homework Statement

A horizontal force of 2N is just sufficient to prevent a block of mass 1kg from sliding down a rough plane inclined at arcsin 7/25 (=16.3 degrees) to the horizontal. Find the coefficient of friction between the block and the plane and then acceleration with which the block will move when the force is removed.

## Homework Equations

Friction = Coefficient of friction x Resistive force (parallel at a right angle to the slope on which the objects acts on)

Force = Mass x Acceleration

## The Attempt at a Solution

Well what I thought was that the force that the object has should be 2+gsin16.3 which equals 4.75N. This means that the acceleration will be 2.75N when the force of 2N is taken away. However the answer is meant to be 1.97ms^-2... Did I work out the acceleration wrong in the first place?

Now attempting to work out the coefficient of friction, I simply did friction over resistive force: gsin16.3/gcos16.3 and that gives me 0.292 but the answer is supposed to be 0.0827... I do not understand what I am doing wrong.

If someone can say what I'm doing wrong and lead me into the right direction then thanks!

EDIT: Worked out coefficient of friction now but can't work out acceleration.

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