Physics - NLM Question with Solution | TestHub
Two blocks 3 kg and 6 kg are placed on a rough surface () as shown in the figure. The friction coefficient between the two blocks is . A force F is applied on one of the blocks as stated in each question.
If F is applied on 6kg block instead of 3kg block then choose the INCORRECT statement
Options:
Answer:
Solution:
With F on the 6 kg block: the only horizontal force on the 3 kg block is the forward friction, so its work is non-negative (A correct). Common acceleration fails when needed friction exceeds 24 N: at the 3 kg block slips at (B correct); at they move together (C correct).
On the 6 kg block, both frictions (from the 3 kg block and from the ground) always point backward, opposing its motion - friction on it can never do positive work. Statement (D) is the incorrect one. Ans. (D)
