Suppose we have a wedge with angle θ on which there is a block. We are pushing the wedge with the least force required to keep the block stationary. If the acceleration of wedge is A then the acceleration of the block along the inclined plane will be gsinθ+Acosθ=0. That means A is negative.
How is this possible physically that we apply a force and the body is accelerating negatively in that direction?
How is this possible physically that we apply a force and the body is accelerating negatively in that direction?