Q5.41Multiple choice
A rectangular box lies on a rough inclined surface. The co-efficient of friction between the surface and the box is µ. Let the mass of the box be m.
- (a)At what angle of inclination θ of the plane to the horizontal will the box just start to slide down the plane?
- (b)What is the force acting on the box down the plane, if the angle of inclination of the plane is increased to α > θ ?
- (c)What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed?
- (d)What is the force needed to be applied upwards along the plane to make the box move up the plane with acceleration a?