I got this answer from the internet
Friction , as the angle gets huger and higher , this is less and less normal force into the inclined plane .
Freefall
Freefall is the situation of having zero weight of a body with a certain mass and acquired when a body is in free fall or there is no gravity.
Weightlessness
The weightlessness of a body in the state in which the body experiences that the body is not being attracted by any force.
Exothermic because it releases heat.
