Force and Motion Dynamics

Which of the following statements best describes friction?

A box is sliding across a floor. In which direction does the kinetic friction force act?

A 5 kg box is pulled horizontally across a wooden floor at a constant speed with a force of 10 N. The coefficient of kinetic friction between the box and the floor is 0.2. What is the magnitude of the kinetic friction force?

A block of mass $m$ slides down an inclined plane with a constant velocity. The angle of the incline is $\theta$, and the coefficient of kinetic friction between the block and the plane is $\mu_k$. What is the magnitude of the kinetic friction force acting on the block?

A heavy crate is at rest on a horizontal floor. A person applies a horizontal force to the crate, but the crate does not move. What type of friction is acting on the crate?

A 10 kg box is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is 0.5. What is the maximum horizontal force that can be applied to the box before it starts to move?

How does the coefficient of static friction ($\mu_s$) typically compare to the coefficient of kinetic friction ($\mu_k$) for the same two surfaces?

A 2 kg block is at rest on a horizontal surface. A horizontal force $F$ is applied to the block. The coefficient of static friction is 0.6, and the coefficient of kinetic friction is 0.4. What applied force is required to initiate motion, and what is the initial acceleration once the block starts moving?

A block of mass $m$ is placed on an inclined plane that makes an angle of $\theta$ with the horizontal. The coefficient of kinetic friction between the block and the plane is $\mu_k$. Assuming the block slides down the incline, what is the net force acting on the block?

A box slides across a horizontal floor with an initial velocity $v$. Due to kinetic friction, the box eventually comes to rest. If the coefficient of kinetic friction between the box and the floor is $\mu_k$, what is the work done by friction in bringing the box to rest?