# What do I do for these problems ?

1. Feb 4, 2012

What do I do for these problems!!?

1. The problem statement, all variables and given/known data
1.A merry-go-round makes one complete revo-
lution in 12.2 s. A 49.4 kg child sits on the
horizontal floor of the merry-go-round 2.3 m
from the center.
Find the child’s acceleration. The accelera-
tion of gravity is 9.8 m/s2 .

2.Find the horizontal force of friction that acts
on the child.

3.What minimum coefficient of static friction is
necessary to keep the child from slipping?

2. Relevant equations

f=M*A
a=(Tangential speed)^6/r
Tangential speed=2pi r/time

3. The attempt at a solution
Don't know how to get acceleration

Last edited: Feb 4, 2012
2. Feb 4, 2012

### cepheid

Staff Emeritus
Re: What do I do for these problems!!?

Welcome to PF,

If the child moves in a CIRCLE at a constant speed, then what MUST be true about the child's acceleration? In other words, what kind of acceleration must he/she be experiencing? How do you go about computing this type of acceleration?

3. Feb 4, 2012

Re: What do I do for these problems!!?

Is it the centrapical Acceleration?

4. Feb 4, 2012

Re: What do I do for these problems!!?

Help?

5. Feb 4, 2012

### cepheid

Staff Emeritus
Re: What do I do for these problems!!?

Yeah, it's the centripetal acceleration. Now, how do you calculate that (given the parameters of the circular motion)?