A rubber ball of mass 025 kg rolls over the gravel with velocity 15 ms and. As discussed the formula for frictional force is given by F mN. For the example consider a wood block of 2-kg mass on a wooden table being pushed from stationary.
N 2 kg 98 Nkg 196 N.
The friction force is best defined using an equation. KE at the bottom of the ramp is known as the mass and final velocity of the ball is known. N mg cos th With th represent the angle the surface is inclined to. So in summary E mkmgcos thd.