# Vertical Circle motion

1. Jun 4, 2012

### jsmith613

This question is about circular motion in a vertical circle

Question 1:
would I be correct in assuming that the magnitude for tension is dependant on
(a) the weight of the object
(b) the position of the object with respect to the horizontal diameter of the circle

So above the 'horizontal diameter' tension is lower than below the 'horizontal diameter' because a component of weight acts towards the circle centre.
When it lies ON the circumference AT the 'horizontal diameter' ONLY tension provides the centripetal force
BELOW the 'horizontal diameter' tension increases because weight opposes the tension force

Is this all correct?

Question 2:
If you look at the free body diagram attached, mg*sin(θ) is present. What does this compoenent of weight do??

Thanks

File size:
6.8 KB
Views:
85
2. Jun 4, 2012

### Staff: Mentor

Yes, but also the speed of the object.

Sounds good, as long as you include the effect of speed.

It creates a tangential acceleration.

3. Jun 4, 2012

### jsmith613

in some cases mgsinθ will be in the same direction as velocity and in others it will be in the exact opposite...I presume this is the force that will cause the speed of the object to vary?

4. Jun 4, 2012

### Staff: Mentor

That is correct.

5. Jun 4, 2012

thanks