A student wants to determine the coefficients of static frictionand kinetic fric
ID: 1744474 • Letter: A
Question
A student wants to determine the coefficients of static frictionand kinetic friction between a box and a plank. She places the boxon the plank and gradually raises one end of the plank. When theangle of inclination with the horizontal reaches 30°, the box starts toslip, and it slides 2.3 m down the plankin 3.9 s at constant acceleration. (a) What is the coefficient of staticfriction?1
(b) What is the coefficient of kinetic friction?
2 (a) What is the coefficient of staticfriction?
1
(b) What is the coefficient of kinetic friction?
2
Explanation / Answer
(a) the coefficient of static friction is givenby s = tan = ......... (b) with help of newtons second law of motion weget that m g sin - f = m a f = fk = kFN = k m gcos with d = 2.3 m and t = 3.9 sacceleration will be a = 2 d / t2 k = ........Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.