# Pendulum in vacuum vs with air resistance

• loesung
In summary, a pendulum in a vacuum experiences no air resistance and will have a constant amplitude and period of oscillation. However, a pendulum with air resistance will experience a force against its motion, resulting in a longer period and decreased amplitude over time. The mass of the pendulum will also affect its motion with air resistance, as a heavier pendulum will experience more resistance and have a slower motion compared to a lighter pendulum. Additionally, a pendulum cannot reach the same maximum height in a vacuum as it can with air resistance, as air resistance causes it to lose energy and decrease in amplitude over time.
loesung
If a pendulum consisting of a string and a bob is allowed to swing in a vacuum vs in air, which has larger period?

Last edited:
Is this a homework problem?

What do you think?

mfb said:
Is this a homework problem?

What do you think?
dont forget about friction at the pivot point.

## 1) What is the difference between a pendulum in a vacuum and a pendulum with air resistance?

A pendulum in a vacuum experiences no air resistance, meaning there is no force acting against the pendulum's motion. On the other hand, a pendulum with air resistance experiences a force due to the air molecules pushing against the pendulum's motion, causing it to slow down.

## 2) How does air resistance affect the period of a pendulum?

Air resistance can cause the period of a pendulum to increase. This is because the force of air resistance acts in the opposite direction of the pendulum's motion, reducing its amplitude and slowing down its movement. This results in a longer period of oscillation.

## 3) Does air resistance affect the amplitude of a pendulum?

Yes, air resistance can cause the amplitude of a pendulum to decrease over time. As the pendulum swings back and forth, the force of air resistance acts against its motion, causing it to lose energy and gradually decrease in amplitude.

## 4) How does the mass of the pendulum affect its motion in a vacuum vs with air resistance?

In a vacuum, the mass of the pendulum does not affect its motion as there is no air resistance to slow it down. However, with air resistance, a heavier pendulum will experience more resistance and therefore have a slower motion compared to a lighter pendulum.

## 5) Can a pendulum reach the same maximum height in a vacuum as it can with air resistance?

No, a pendulum cannot reach the same maximum height in a vacuum as it can with air resistance. In a vacuum, the pendulum will continue to swing back and forth with the same amplitude, while with air resistance, it will gradually lose energy and decrease in amplitude. This means that the maximum height it reaches will be lower than in a vacuum.

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