3 A box, of mass 3 kg , is placed on a rough slope inclined at an angle of \(40 ^ { \circ }\) to the horizontal. It is released from rest and slides down the slope.
- Draw a diagram to show the forces acting on the box.
- Find the magnitude of the normal reaction force acting on the box.
- The coefficient of friction between the box and the slope is 0.2 . Find the magnitude of the friction force acting on the box.
- Find the acceleration of the box.
- State an assumption that you have made about the forces acting on the box.