As the cloud shrinks in size, its central temperature as a result of its

As the cloud shrinks in size, its central temperature increases as a result of its
gravitational potential energy being converted to thermal energy.

Answers: increases1

gravitational potential energy being converted to thermal energy.2

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on