Mechanics > Newton's Laws > Newton's Second Law

DCS# 1G10.40 v. 2

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ATWOOD'S MACHINE

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APPARATUS

pulley with good bearings and small rotational inertia	202-15-E3
two 500-g masses and one 50 g	101-05-C
string	202-15-E3
meter stick	101-05-F
stopwatch	101-05-D3
foam landing pad	202-01-A

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DESCRIPTION

The two 500 g masses hang from each end of the string over the pulley.  Hang an additional 50 g from the base of one of the masses and release it from one meter above the landing pad while timing its descent.