I have this question and I got its solution I just wanna know why the friction f

Question

I have this question and I got its solution I just wanna know why the friction force isn't included in part 3 for the conservation of energy equation, as there should be static friction acting on the body correct?

The mass of the uniform disk is 60 kg, and its radius is R = 0.5 m, the spring constant is k = 600 N/m. the disk is to rolled to the left until the spring is compressed 0.3 m and released from rest (1) If the disk rolls without slipping, what is its angular acceleration at the instant it is released? (2) What is the minimum coefficient of static friction for which the disk will not slip when it is released? (3) If the disk rolls without slipping, what are the angular velocity and angular acceleration of the disk when the spring becomes uncompressed? Solution: FBD Fs R. 2ks 2(600)(03) = 4 rad / s 3(60) (0.5) (2)50 = 0.3 m (600)(0.3) -'ng = 14, (60)(9.81) 14 2 0.102 = 60 s conservation of energy: so 2k 0.3 2(600) R V3 0.5 3(60) 401.55rads 771(OR)-+-(-1) 4

Explanation / Answer

friction is necessary for a ball to start rolling but once the rolling condition has been met the ball experiences no friction.

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