How friction is going to affect the final velocity of bullet/pendulum system in an experiment of perfectly inelastic collision?
Friction force always acts in the opposite direction to that of the motion. Due to this, a deacceleration originates causing the velocity of the objects to decrease. So, the velocity of the bullet when it collides with the pendulum is somewhat less than the actual velocity.
Similarly, after collision, the velocity of the bullet-pendulum system too decreases than the theoretical value. Finally , as the initial velocity is smaller than the theoretical value, the pendulum will rise to a lower height than predicted by our calculations.
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