Question
Question: A block A of mass 200 kg rests on a block B of mass 300 kg. A is tied with a horizontal string to a ...
A block A of mass 200 kg rests on a block B of mass 300 kg. A is tied with a horizontal string to a wall. Coefficient of friction between A and B is 0.25 and that between B and floor is 0.2. The horizontal force F needed to move the block B is
(g = 10 ms–2)
A
550 N
B
1100 N
C
1500 N
D
2200 N
Answer
1500 N
Explanation
Solution
The horizontal force F needed to move the block B
= 0.25 (200g) + (0.2) (500 g) = 1500 N.