Friction (Grades 11-12)
Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.
You start pushing a 2 kg sanding block, with coefficients of friction, [math]mu_s=0.77" and "mu_k=0.70[/math], against a wooden desk you are sanding. You use a normal force of 91.5N.
Coefficient of friction for all-weather tread tire:
Dry road: [math]mu=0.7[/math]
Wet road: [math]mu=0.4[/math]
Icy road: [math]mu=0.1[/math]
Mass of a typical car: 1500kg
Coefficient of friction for NASCAR tread-less tire:
Dry road: [math]mu=0.9[/math]
Wet road: [math]mu=0.1[/math]
Mass of a typical NASCAR:1542kg