A object rest on a ramp . As the highs end of the ramp is raised further, the angle of inclination causing the object to start moving. with the help of a free- body diagram, explain why this happen
When the high end of the ramp is raised further, the angle of inclination of the ramp also increases. This causes the force of gravity acting on the object to have a greater component parallel to the ramp surface. From the free-body diagram, we can see that the force of gravity acts downwards on the object, and is resolved into two components: a perpendicular component (mgcosθ) and a parallel component (mgsinθ), where θ is the angle of inclination.
As the angle θ increases, the parallel component of the force of gravity also increases, until it becomes greater than the frictional force acting on the object. When this happens, the object starts to move down the ramp due to the force of gravity pulling it in that direction. This is because the parallel component of the force of gravity is now greater than the force opposing its motion (frictional force).
Therefore, the raising of the high end of the ramp increases the angle of inclination, which in turn increases the parallel component of the force of gravity acting on the object, causing it to start moving down the ramp.