A 1 kg block is being held at rest by friction on a ramp angled at 45 degrees above the horizontal.

Question

A 1 kg block is being held at rest by friction on a ramp angled at 45 degrees above the horizontal. What is the magnitude of the force of friction acting on the block?

Answer 1

Being held, the block feels a net force of zero.

Lying on 45 degrees about the horizontal, the gravity pulls the block with force mg sin(45)=5*1.414=7.07N

The friction is to balance this force, so the friction is 7.07 N