Question

When attempting to determine the coefficient of kinetic friction, why is it necessary to move the block with constant velocity? When attempting to determine the coefficient of static friction, why is it necessary to measure the applied force just before the block moves? Are these two scenarios (constant velocity and almost in motion) the only scenarios when friction is present? Explain your answer.

Answer 1

In order for a block to be moving at a constant velocity, the forces must be balanced. The friction force must be balanced by a motive force pushing the block. ... If a block is moving on a rough surface, and friction is the only force acting on it, it is not moving with a constant velocity.

When the two objects are horizontal there is no frictional force. As the objects are slowly tilted, the force of static friction must increase from zero to counteract the component of the force of gravity that acts along the interface.

When a body is in motion, it has resistance because the body interacts with its surroundings. This resistance is a force of friction. Friction opposes relative motion between systems in contact but also allows us to move, a concept that becomes obvious if you try to walk on ice.

yes this is only happened when fricttion is present and static an kinetic friction works..