91Ó°ÊÓ

When an external force acts on an item, the object accelerates in the same direction and at a rate proportional to the force. Which is given by

$\mathit{F}\mathbf{=}\mathbf{}\mathit{m}\mathit{a}$ (1)

WhereF is external force, m is the mass of object, and a is acceleration of object.

A ball is rolling along at speed without slipping on a horizontal surface when it comes to a hill that rises at a constant angle above the horizontal.

The ball would simply not go up the hill and instead continue to roll with the same angular velocity if there was no friction at all. The ball needs a little bit of friction to roll up the hill.

The initial kinetic energies of the ball's linear and rotational motion can be used to create gravitational potential energy. The ball will move farther as a result of the slope's increased friction.

The reason for this is because if a force is applied via the centre of mass of a ball that is at rest on a frictionless surface, the ball will glide over the surface without spinning. Given a force, the stationary ball will experience frictional force acting on its ground-contact edge, but in the opposite direction of the supplied force. The ball starts to rotate as a result of the torque produced by the friction.

A ball cannot start rolling without static friction as a result. The bottom edge of the ball will swiftly come to rest because the ball moves from top to bottom at a speed ofand its centre of mass moves at a speed of v. The ground's edge doesn't produce friction because it is immovable.

As a result, for a ball to begin rolling, friction is required; but, once the rolling condition has been met, friction no longer exists.