Three blocks with masses m, 2m and 3m are connected by strings (m at the top, 2m below it and 3m at the bottom). After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

Question

Dr. Abubacker · Accepted Answer

[Solution from source] All three blocks move at constant velocity, so their acceleration is zero and by Newton's second law the net force on each block, including 2m, is zero. 2mg is only the weight of that block, which is balanced by the string tensions. Answer (1).

Q. Three blocks with masses m, 2m and 3m are connected by strings (m at the top, 2m below it and 3m at the bottom). After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

Explanation

Reviewed by Dr. Abubacker

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