An air puck of mass m is tied to a string and allowed to revolve at a speed v in

Question

An air puck of mass m is tied to a string and allowed to revolve at a speed v in a circle of radius r on a horizontal, frictionless table. The other end of the string passes through a small hole in the center of the table, and a block of metal with mass M is tied to that end of the string. a) draw a separate free-body diagram for the puck and the metal block. b) write down Newton's 2nd law for each object separately. C) determine the speed v the puck mut have in order to make sure the block doesn't fall. d) solve part C with the following data: m=0.5kg, M=4kg, and r=0.3m.

Explanation / Answer

b) Fnet = T - Mg.
If the hanging mass has constant (e.g., 0) velocity, then Fnet = 0 and T = Mg.
puck: Fnet = mv

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