Group a Newtom\'s Laws of Motion aad Free IRody Diasram Fled mbalic espressinn f
ID: 1657859 • Letter: G
Question
Group a Newtom's Laws of Motion aad Free IRody Diasram Fled mbalic espressinn for the Follow ing questions (show your detailed work including free ss the eneleration ofa system showing in right flere too tlem, -, 2 As shown in the figure, a woman is straining to lift a large crate, but without success because it is too heavy. We denote the forces on the crate as follows: P is the magnitude of the upward force being exerted on the crate by the person, C is the magnitude of the vertical support force on the crate by the floor, and W'is the weight of the crate. How are the magnitudes of these forces related while the person is trying unsuccessfully to lift the crate? D)P-C Page 1 of 2Explanation / Answer
1] case 1 Let Tension in string be T , and acceleration of the masses be a,
Applying force equation on the two masses, we get,
m2g - T = m2a
T - um1g= m1a
adding both equation,
(m1+m2)a = m2g - um1g
a= (m2g - um1g)/(m1+m2)
in first case u = 0,
so a = m2g/(m1+m2)
Case 2: when u is non-zero,
a = (m2g - um1g)/(m1+m2)
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