Question

A 4 kg object starts from rest from the top of a rough 30 degree incline and slides 3.0 m down the incline in 2.0 s. Find the coefficient of friction between the block and the incline.

A)0.25
B)0.33
C)0.4
D)0.90

Answer 1

Ans is option C 0.4

ng Sino Ans (30° ingcosot ng sino is the downward force that causes the movement of blocu. f is the frictional force acting upwards the inclined plane. - u XN I u-coefficient - - Mx mg cos 30 1 of friction. 2. Wes for downward force on the block het ing sino - f - Fnet – 9x9.81& Sin 30 – ux. & Foot = 4 (9.81 x - ux 9.81x wo) 4* 9.81xcos30

Now accleration a- Fnett E-ma] =) m a. 4 (9.81th- u x 9.81 ) -) a . (4.905 – 8. 4957 ult 4 Ginen, Distance covered Is = Time 3 m) hanen Its ns] Indal veloculty luno Indial velocity uno (As it was at rest)

sout that? we get – 3- oxt & 2x (4.905-8-4957 m) + (2) 2 - 3 - 2 x (a.gos- 8.49574) + 4 - 3x2 – 4.905-8.4957u - ss = 4.905 - 8.4957a =) 8. 4957 u = Magos-los u=0.4 (Aus) Toption (c) is correct 4
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