In the lab you measured the coefficient of static friction using a felted block

Question

In the lab you measured the coefficient of static friction using a felted block on the table top with a pulley and some slotted weights. A completely different way to measures mu, is by using a block and an adjustable plane. Weigh the block on a triple beam balance. Place the block on the plane and gradually increase the elevation angle until the block just breaks free and slides; f, is a maximum at this angle. What is the formula for mu, in this case? (a) mu_x = Mg tan theta (b) mu_x = csc theta (c) mu_x = tan theta (d) mu_x = Mg cot theta e) None of the above Which of the following reading errors (numerical value and unit) that you would record for measurements are incorrect? (a) Ruler: plusminus 0.05 cm (b) Vernier Caliper: plusminus 0.05 mm (c) Micrometer: plusminus 0.005 mm (d) Triple Beam Balance: plusminus 0.05 grams (e) Stop Watch: plusminus 0.01 seconds In the Behr vertical free-fall experiment, we would get a better value of g by allowing the metal ball to fall through 200 meters rather than the roughly 2 meter drop used in lab. (a) True (b) False In the spring cannon projectile motion experiment, what horizontal distance would you expect projectile to travel if the muzzle velocity were 45 m/s? (a) 10 m b) 14 m (c) 19 m (d)24 m (e) None of the above.

Explanation / Answer

20) horizontal direction: mgsin-fs = 0

mgsin = sN

vertical direction

N-mgcos=0

N=mgcos

so

mgsin=s (mgcos)

s = tan

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21) error reading= +/- 1/2 ( least count)

all are correct except stopwatch so last option is correct

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