(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

https://online-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/spring09/homework/10/bowling_ball/8.gif [Broken]

A bowling ball 25 cm in diameter is slid down an alley with which it has a coefficient of sliding friction of ยต = 0.6. The ball has an initial velocity of 11 m/s and no rotation. g = 9.81 m/s^2.

Given that the initial deceleration of the ball is 5.886.

What is the initial angular acceleration of the ball?

2. Relevant equations

For a sphere Icm = (2/5)mr^2.

3. The attempt at a solution

Firstly, i tried to use the formula [tex]\alpha = a/R[/tex]

Then i got some value of acceleration which turns out to be wrong.

After that, when i used the torque equation [tex]\tau = I\alpha[/tex]

I got the different answer and it was correct...

Why did i get the wrong answer at the first attempt?

I am really confused when i could use the transformation formulae([tex]s to \theta, v to \omega, a to \alpha[/tex])....

Could someone help me out here..?

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# Homework Help: Rotational Kinematics

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