Question
Question: A block slides on a rough horizontal ground from point A to point B. Point C is midway between A and...
A block slides on a rough horizontal ground from point A to point B. Point C is midway between A and B. The coefficient of friction between the block and the ground is constant. Its angular momentum L about C is plotted against time t. Which of the following curves is correct –
A
B
C
D
Answer
Explanation
Solution
At any position of the block, its angular momentum L about C is equal to its linear momentum (P) × the height of its COM (h) above C. As its velocity v decreases linearly with time, L will decrease linearly with time.
