Block A of mass 4 kg and block B of mass 6 kg are resting on a horizontal surface as shown in the
figure. There is no friction between the block B and the horizontal surface. The coefficient of friction
between the blocks is 0.2. If the value of g = 10 ms? , the maximum horizontal foce F that can be
applied on block B without any relative motion between A and B is
A
IBF
(3) 60 N
(4) 100 N
(1) 20 N
(2)40 N
Answers
Answer:
100N ......................
Answer:
20 N
ExplanatFriction between the blocks f = µmg = .2 × 4 × 10 = 8 N For 6 kg block F – f = 6a F = 6a + 8 ...(i) For 4 kg block f = 4a 8 = 4a a = 2m/s2 ...(ii) blocks have no relative motion so there acceleration will be same. Putting the value of 'a' from eq. (i) to (ii) F = 6 × 2 + 8 = 20N
