# Tangential Acceleration and Coefficient of static friction

• Pureness
In summary, you need to find something that has the forces of a net force, a normal force, and work in it.

## Homework Statement

There's a ride called the Cajun Cliffhanger. it's a rotating drum that rotates and makes you stick to the walls. here's are the infomation

The diameter is 5.3m
the speed is 4.2 seconds per rotation at final speed
it takes 10.1 seconds to reach the final speed
You have to find out

Your average tangential acceleration before final speed is reached
the value of the coefficient of static friction between your clothing and the drum wall

Pureness said:

## Homework Statement

There's a ride called the Cajun Cliffhanger. it's a rotating drum that rotates and makes you stick to the walls. here's are the infomation

The diameter is 5.3m
the speed is 4.2 seconds per rotation at final speed
it takes 10.1 seconds to reach the final speed
You have to find out

Your average tangential acceleration before final speed is reached
the value of the coefficient of static friction between your clothing and the drum wall

Welcome to PF.

What are your thoughts on how to approach it?

What kind of forces do you think will need to be generated to satisfy the problem?

well i found out the final velocity is 1.5 m/s
I think the acceleration at final speed is 0.1m/s2 which i got by using a=(vf-vi)/t which is 1.5m/s/10.1 seconds=0.1m/s2

Pureness said:
well i found out the final velocity is 1.5 m/s
I think the acceleration at final speed is 0.1m/s2 which i got by using a=(vf-vi)/t which is 1.5m/s/10.1 seconds=0.1m/s2

Looks to me like

ω = 2*π/ T = 6.283 / 4.1

V = ω *r

so ...

a = V / T = 6.283 * r / (4.1 * 10.1)

Knowing V you can figure the centripetal acceleration and the force available to determine the friction coefficient required.

is there a formula or equation for centripetal acceleration?

ok thanks for that. i have another part of the question also. it says what is your average tangential acceleration before the final speed is reached. how do i find that

thanks. i got another qustion though
can you think of something that can be measured that has these forces in it?
1) a net force
2) a normal force
3) work
4) power

still need help

Pureness said:
thanks. i got another qustion though
can you think of something that can be measured that has these forces in it?
1) a net force
2) a normal force
3) work
4) power
A block sliding down a ramp...

Something tells me you might want to be more specific about what you're asking.