- #1

jegues

- 1,097

- 3

Hello all,

I seem to be having issues drawing the correct force diagrams... The question is as follows:

"A 1kg mass, attached to the end of a string, is swung in a vertical circle having radius of 0.3m. When the string makes and angle of 30 degrees below horizontal, the speed of the mass is 3.0m/s.

My attempt at the solution (I know the force diagram is where I'm going wrong) is in the picture along with my drawn diagram. (It's attached to this thread)

Note: phi is simply 90-30 = 60 degrees. I also forgot to put a dash inbetween mg and sin(theta)

It should look like this:

T - mg/sin(theta) = ma

T = m[(v^2)/r] + mg/sin(theta)

I seem to be having issues drawing the correct force diagrams... The question is as follows:

"A 1kg mass, attached to the end of a string, is swung in a vertical circle having radius of 0.3m. When the string makes and angle of 30 degrees below horizontal, the speed of the mass is 3.0m/s.

My attempt at the solution (I know the force diagram is where I'm going wrong) is in the picture along with my drawn diagram. (It's attached to this thread)

Note: phi is simply 90-30 = 60 degrees. I also forgot to put a dash inbetween mg and sin(theta)

It should look like this:

T - mg/sin(theta) = ma

T = m[(v^2)/r] + mg/sin(theta)