Does air resistance affect a pendulum?

Yes, air resistance does affect a pendulum. As the pendulum swings, it moves through the air, and the air exerts a resistance force on it. This resistance slightly slows down the pendulum's swing. Additionally, friction at the pivot point where the pendulum is attached also contributes to a loss of energy. Together, air resistance and friction cause the pendulum to eventually lose energy and come to a stop. In simple physics problems, these factors are often ignored to focus on the ideal behavior of pendulums, but in real-world scenarios, they are significant and can't be overlooked.