Leonardo di Vinci was very possibly the first person to do quantitative measurem
ID: 1602765 • Letter: L
Question
Leonardo di Vinci was very possibly the first person to do quantitative measurements on friction forces. However, since he wrote everything down in sort of a secret code (mirror writing), his work was overlooked for centuries In one experiment, di Vinci placed a wooden block on an inclined plane and then slowly increased the angle of the plane until the block just began to slide. If the block began to move at an angle of 30, what was the coefficient of static friction that Leonardo would have recorded? (mu_s = 0.58)Explanation / Answer
normal force N = m*g*costheta
frictional force f = u*N
static frictional force fs = us*N = us*m*g*costheta
along the incline component of gravitational force Fg = m*g*sintheta
if the body starts to slide Fg = fs
m*g*sintheta = us*m*g*costheta
tantheta = us
us = tan30 = 0.58 <<<---answer
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