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Tushar Watts Grade: 12
        

4403-2121_3899_laws1.bmp


Two masses A and B of 10 kg and 5 kg resp are connected as shown.The coeff of friction of A with table is 0.2. Find the min mass of C that may be placed on A to prevent it from moving.

7 years ago

Answers : (1)

Pratham Ashish
17 Points
										hi,


let the boxes are not moving ,
in this case, for block b you can write,

5g - T = 0


let the mass of block c be x
if the boxes are not moving

friction force on A = 0.2 * ( c + 10) g


for block A ,

T - friction Force = 0

T - 0.2 * ( c + 10) g = 0

from eq .(1)..


T = 5g

Eq. 2 becomes,

5g - 0.2 * ( c + 10) g = 0

5g - 0.2 c g - 2 g = 0

3g = 0.2 c g

c = 15 kg







7 years ago
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