Grass obtains 10%of the energy from sun. when the mouse eats the grass it only
percent of the sun's energy while is lost to heat

According to Linderman's ten per cent law, Grass obtains 10%of the energy from sun. when the mouse eats the grass it only get 10 percent of the sun's energy while 90 is lost to heat

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