Mechanical comprehension · Difficulty 3
Try this ASVAB-style question.
Choose your answer before opening the explanation. This original practice item is for preparation and does not reproduce an official test question.
Which situation is the best example of friction?
- A worker lifts a box upward onto a shelf.
- A small driving gear turns a larger driven gear more slowly with greater torque.
- Brake pads slow a rotor by rubbing against it.
- A longer wrench increases the turning effect from the same hand force.
Reveal answer and explanation
Brake pads slow a rotor by rubbing against it.
friction is a force that opposes relative motion between contacting surfaces. Brake pads slow a rotor by rubbing against it.