7. Friction, Inclines, Systems

$\text{Which of the following lists all the main types of friction encountered in classical mechanics?}$

When tightening a head bolt, approximately what percentage of the applied turning torque is typically lost to kinetic friction rather than used to actually stretch the bolt?

Which of the following methods would most effectively reduce the kinetic friction experienced by a person sliding down a water slide?

Which type of friction is primarily responsible for keeping a pile of rocks from falling apart?

Which of the following lists correctly identifies the four main types of friction encountered in physics?

Which of the following lists all the main types of friction encountered in physics?