A 20 kg mass is moving down a ramp and there is friction. Describe all the forces acting on it using terms such as weight, spring force, gravitational force, etc.

mass of block, m = 20 kg

let teh angle of inclination of the ramp with the horizontal is θ.

Weight of the block = mg

There are two components of the weight

The component of weight of block along the plane = mg Sinθ

The component of weight of block normal to the plane = mg Cosθ

Friction force is acting opposite to the motion, i. e., along the plane and upwards, f = μN = μ mg Cosθ

Look at the diagram to find the directions of force.