A small mass m is set on the surface of a sphere, Fig. 5–54. If the coefficient of static friction is μ_s = 0.70, at what angle Ø would the mass start sliding?

Which of the following is an example of a static friction process?

Which of the following best describes the difference between $f\_\mathrm{static}$ (static friction) and $f\_\mathrm{kinetic}$ (kinetic friction)?

Why do clothes often cling together after tumbling in a clothes dryer?

A cyclist is riding on a flat road and needs to make a turn of radius $r$ at a constant speed $v$ without skidding. What is the minimum possible coefficient of static friction between the bike tires and the ground required to safely make the turn?

When you walk across a carpet and then touch a metal object, you often feel a shock. Which of the following best explains this phenomenon in terms of static friction?

Which type of friction is generally more difficult to overcome when starting to move an object at rest on a surface?

A block $1$ rests on a horizontal surface and is connected by a light string over a frictionless pulley to a hanging block $2$. If block $2$ is heavier and tends to pull block $1$ to the right, in which direction does the static friction force act on block $1$?