# Circular motion help

1. Homework Statement
The problem is shown in the attachment.

2. Homework Equations

3. The Attempt at a Solution

I have no idea how to answer these questions as I was absent at the time so could someone please explain to me how to work these out please?
1. Homework Statement

2. Homework Equations

3. The Attempt at a Solution

#### Attachments

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Air
Clues:

a) They are asking for the direction of the centripetal acceleration.

b) They are asking for the direction of the centripetal force.

c) If velocity is applied, then it moves at tangent. Something is needed to make it travel in circle.

d) Calculate $v$ using $v = \frac{distance (circumference)}{time}$ and then use formula $f = \frac{mv^2}{r}$.

e) Think about $f = ma$. If time period changes then the iron ball may be speeding up.

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I don't understand... i'm sorry

rock.freak667
Homework Helper
I don't understand... i'm sorry
Do you actually understand what is circular motion and what is "centripetal force" ?

Air
Paulo2014 said:
I don't understand... i'm sorry

http://www.s-cool.co.uk/topic_quicklearn.asp?loc=ql&topic_id=7&quicklearn_id=1&subject_id=2&ebt=&ebn=&ebs=&ebl=&elc=" [Broken]

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