When an object slides down a ramp made of rubber at a steep angle, how does the combination of the angle of incline and the material affect the frictional force experienced by the object?

When an object slides down a steep rubber ramp, the frictional force is the product of the rubber’s coefficient of friction and the normal force, which is the component of the weight perpendicular to the surface. As the incline gets steeper, the component of gravity that pushes the object sideways (parallel to the ramp) increases, but the component pressing it into the ramp (normal) decreases because the weight is more aligned with the ramp. Since the normal force is smaller on a steeper incline, the frictional force – even though rubber has a high coefficient – actually drops. Thus, the steepness reduces friction, while the rubber material keeps the coefficient high; the net friction is the balance of a high coefficient times a reduced normal force. For example, on a 45° rubber slope the friction might be only about half of what it would be on a flat surface, even though rubber normally offers strong grip.