A crate slides at constant speed on a level floor. Use the free-body diagram. What is the coefficient of kinetic friction?

A 60 kg sled slides across level snow with μ_k = 0.15. Use g = 9.8 m/s²; on a level surface with no vertical pull, N = mg. What is the kinetic friction force?

A box stays still until a push reaches 95 N; once sliding, a 70 N push keeps it moving at constant speed. What does this show?

Use the coefficient table. A 25 kg wooden block slides on wood. Take g = 9.8 m/s²; on this level surface with no vertical pull, N = mg. What is the kinetic friction force?

An 18 kg box slides across a level floor with μ_k = 0.40. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is the kinetic friction force?

A package is pulled across a level surface. Use the free-body diagram to find the coefficient of kinetic friction.

A crate slides across the same floor with the same load, but its speed doubles. In the simple friction model, what happens to the kinetic friction force?

A 75 kg crate is at the verge of slipping on a level floor with μ_s = 0.60. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is the maximum static friction?

Use the coefficient table. A 50 kg rubber tire slides on dry concrete. Take g = 9.8 m/s²; on this level surface with no vertical pull, N = mg. What is $f_k$?

Two identical blocks of the same material slide at the same speed, one on a wide face and one on a narrow face. Their masses are equal. What does the simple model predict?

The diagram shows a sliding block on a horizontal surface. What coefficient of kinetic friction matches the diagram?

A 30 kg crate has a kinetic friction force of 88.2 N on a level floor. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is μ_k?

On a level surface with no vertical pull, why does the normal force equal the weight?

A 40 kg cabinet begins to slip when static friction reaches 196 N. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is μ_s?

Use the coefficient table. A 10 kg steel block on steel is just about to slide. Take g = 9.8 m/s²; on this level surface with no vertical pull, N = mg. What is $f_s$(max)?

A student pushes a stationary crate with 20 N, and the maximum static friction is 60 N. The crate does not move. What is the static friction force?

Use the free-body diagram for the sliding case. What is the coefficient of kinetic friction?

A 5.0 kg textbook slides across a level lab bench with μ_k = 0.25. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is $f_k$?

A hockey puck slides to the right across rough ice. Which direction is the kinetic friction force on the puck?

A 20 kg block has μ_s = 0.55 and μ_k = 0.35 on a level floor. Use g = 9.8 m/s²; with no vertical pull, N = mg. How much larger is $f_s$(max) than $f_k$?

A worker drags a loaded bin at steady speed. Use the diagram. What is μ_k for the bin and floor?

Use the coefficient table. An 80 kg ice block slides on ice. Take g = 9.8 m/s²; on this level surface with no vertical pull, N = mg. What is the kinetic friction force?

Which statement best describes the coefficient of friction?

A 12 kg lab cart experiences 17.6 N of kinetic friction on a level track. Use g = 9.8 m/s²; with no vertical pull, N = mg. What is μ_k?

Oil is cleaned off two metal surfaces, increasing the coefficient of friction while the normal force stays the same. What happens to the friction force?

A sled is pulled steadily across level ground. Use the free-body diagram. What is the coefficient of kinetic friction?

A sliding drawer has a normal force of 35 N and μ_k = 0.20. What is the kinetic friction force?

Which equation gives the maximum static friction force before an object starts sliding?

A 10 kg box rests on a level floor with μ_s = 0.50. Use g = 9.8 m/s² and N = mg. A 60 N horizontal push is applied to it. What happens?

A box moves at constant speed while a person pulls it horizontally across a rough floor. What must be true about the applied force and kinetic friction?