2When a 20 N weight is hanging from a string, there are no forces on the weight

Question

2When a 20 N weight is hanging from a string, there are no forces on the weight other than gravity and the string.Describe the tension of the string in each of the following situations:

a-if the weight is held stationary the tension is

b-if the weight is raised upward with constant velocity, the tension is

c-if the weight is allowed to accelerate downward the tension is

d-if the weight is swung in a vertical circle, the tension at the bottom of the circle is

g-if the weight is swung in a vertical circle, the tension at the top of the circle is

choices for all of the questions:

1- 0 N

2-less than 20 N

3-20 N

4-more than 20 N

5- impossible to determine without more information

Explanation / Answer

a) ----> 3) 20 N

b) ----> 3) 20 N

c) ----> 2) less than 20 N

d) ----> 4) more than 20 N

g) ----> 5) Impossible to determine without more information.

tension in the string in the given cases.

a) T = m*g = 20 N

b) T = m*g = 20 N

c) T = m*g - m*a < 20 N

d) T = m*g + m*v^2/r > 20 N

e) T = m*g - m*v^2/r

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