2 questions from rolling motion

[DarkBallade]

Both the questions are at https://imgur.com/a/o7B20
The problem I am facing is that on a straight line friction is there and I can't balance it. Using F=ma and T=Iw doesn't work.

 

[Cutter Ketch]

Both the questions are at https://imgur.com/a/o7B20
The problem I am facing is that on a straight line friction is there and I can't balance it. Using F=ma and T=Iw doesn't work.

Knowing the mass of the ball and the coefficient of friction you know the force of friction, so you know what to put for Force and Torque. And don't forget that the ball is not constrained, so it gets torque and linear acceleration.

 

[Simon Bridge]

Welcome to PF;
The trick is to realize what kind of friction is between the rolling ball and the plank.
Otherwise as above.

 

[DarkBallade]

Knowing the mass of the ball and the coefficient of friction you know the force of friction, so you know what to put for Force and Torque. And don't forget that the ball is not constrained, so it gets torque and linear acceleration.

But that's the problem I can't from those equations

 

[berkeman]

Both the questions are at https://imgur.com/a/o7B20
The problem I am facing is that on a straight line friction is there and I can't balance it. Using F=ma and T=Iw doesn't work.

This thread is closed because it doesn't comply with the PF rules for schoolwork posts. Please check your PMs, and re-post your question using the Homework Help Template and showing your work.