In the given figure the blocks A, B and C weigh 4 kg, 6 kg and 8 kg respectively. The co-efficient of sliding friction between any two surfaces is 0.5. The force F⃗ required to slide the block C with constant speed i $s ________$ N.
(Use g = 10 m/s²)

Question

In the given figure the blocks A, B and C weigh 4 kg, 6 kg and 8 kg respectively. The co-efficient of sliding friction between any two surfaces is 0.5. The force F⃗ required to slide the block C with constant speed i $s ________$ N.

(Use g = 10 m/s²)

G1 Physics · Accepted Answer

The three blocks are arranged as shown in the source figure, with A on B and B on C. Coefficient of sliding friction: μ = 0.5. For block A of mass 4 kg, the normal force at the A-B contact is N(A-B) = 4g = 40 N. Therefore the friction magnitude is f(A-B) = μN(A-B) = 0.5×40 = 20 N. At the B-C contact, the normal force supports A and B together: N(B-C) = (4+6)g = 100 N. Hence, f(B-C) = 0.5×100 = 50 N. At the C-ground contact, the normal force supports all three blocks: N(C-ground) = (4+6+8)g = 18…

In the given figure the blocks A, B and C weigh 4 kg, 6 kg and 8 kg respectively. The co-efficient of sliding friction between any two surfaces is 0.5. The force F⃗ required to slide the block C with constant speed i s ________ N. (Use g = 10 m/s²)