(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 5.0-kg mass hangs at the end of a cord. Find the tensionin the cord if the acceleration of the mass is a)1.5 m/s squared up, b) 1.5 m/s squared down

Answers: a) 57 N; b)42 N

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A sample question in our physics book is "An object of massmis supported by a cord. Find the tension in the cord if the object is a) at rest, b) moving at a constant velocity, c) accelerating upward with acceleration a = 3g/2, and d) accelerating downward at a = 0.75g

a) ay = 0: FT - mg = may = 0 or FT = mg

b) ay = 0: FT - mg = may = 0 or FT = mg

c) ay = 3g/2: FT - mg = m(3g/2) or FT = 2.5mg

d) ay = -3g/4: FT - mg = m(-3g/2)or FT = 0.25mg

2. Relevant equations

The relevant equations are:

See 1

3. The attempt at a solution

I know there is something I'm just not getting in this problem... It should be so simple but everytime i look at it and attempt it i just keep getting the wrong answer... Also in the sample problem, how are they getting 2.5 out of 3g/2??? It's just not clicking!!!

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# Homework Help: Newton's Laws: Finding the tension in a cord.

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