1 / 9

Friction Quiz

Friction Quiz. Laws of Dry Friction Coefficients of Static vs. Kinetic Friction Impending Motion, Angle of Friction. 1. Which statement best defines dry friction ?. a) The force parallel to the surface of two objects in contact with each other.

gerald
Télécharger la présentation

Friction Quiz

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Friction Quiz • Laws of Dry Friction • Coefficients of Static vs. Kinetic Friction • Impending Motion, Angle of Friction

  2. 1. Which statement best defines dry friction? a) The force parallel to the surface of two objects in contact with each other. b) The normal force of two objects in contact with each other. c) The perpendicular force of two objects in contact with each other. d) The force that resists an object rolling across a surface.

  3. 2. What horizontal force starts the object moving, if it weighs 50.0 kg and mstatic=0.60? a) 50.0 N b) 83.3 N c) 294 N d) 491 N

  4. 3. What is the normal force in the following figure if W=200 N and Fapplied=100 N? a) 100.0 N b) 106.0 N c) 165.8 N d) 200 N

  5. 4. What is the maximum frictional forcein the figure below if W=200 N, Fapplied=100 N and mstatic=0.60? a) 99.5 N b) 106.8 N c) 165.8 N d) 200 N

  6. 5. What is coefficient of kinetic friction in the figure below if Fhorizontal=200 N, Fvertical=650 N, W=800 N and the object is moving? a) 0.200 b) 0.308 c) 0.600 d) 0.250

  7. 6. Compute the coefficient of static friction from the following figure assuming slippage is about to occur. a) 0.902 b) 0.477 c) 0.445 d) 0.431

  8. Correct answers • a (tangential or parallel force) • c (=50.0 x 9.81 x 0.60) • c (=200 – 100 sin20°) • a (=165.8 x 0.60) • b (=Fh/Fv = 200/650) • b (=tan 25.5°)

  9. Rank yourself • 5-6: Consider tribology (friction science) as a career. • 3-4: Check that your calculator is using the metric system. • 0-2: You are on a slippery slope, increase your normal forces and study habits.

More Related