# Homework Help: Circular motion help

1. Mar 21, 2008

### Paulo2014

1. The problem statement, all variables and given/known data
The problem is shown in the attachment.

2. Relevant 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. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### Circular motion.doc
File size:
45 KB
Views:
90
2. Mar 21, 2008

### 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.

Last edited: Mar 21, 2008
3. Mar 21, 2008

### Paulo2014

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

4. Mar 21, 2008

### rock.freak667

Do you actually understand what is circular motion and what is "centripetal force" ?

5. Mar 22, 2008

### Air

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]

Last edited by a moderator: May 3, 2017