# How does a physical pendulum work?

A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point S (Figure 24.2). A physical pendulum consists of a uniform rod of length d and mass m pivoted at one end. The pendulum is initially displaced to one side by a small angle θ0 and released from rest with θ0

## What is a physical pendulum in physics?

Definition of physical pendulum : a rigid body so mounted on a horizontal axis through its center of suspension that when the body is displaced it vibrates freely about its position of equilibrium —distinguished from simple pendulum.

## What is the rotational inertia of a physical pendulum?

Note that for a simple pendulum, the moment of inertia is I = ∫r2dm = mL2 and the period reduces to T = 2π√Lg. In extreme conditions, skyscrapers can sway up to two meters with a frequency of up to 20.00 Hz due to high winds or seismic activity.

## What are the example of a physical pendulum?

One example of a physical pendulum is a baseball bat swinging back and forth. In the same exact way that a simple pendulum has the ability to undergo simple harmonic motion, a physical pendulum under certain conditions can experience simple harmonic motion.

## What is the difference between a simple pendulum and a physical pendulum?

A simple pendulum needs a tread or a string to suspend from a rigid support. A physical pendulum does not need any string for the suspension. There is a tension force acting on the string, which helps the object to suspend. As a physical pendulum does not need any string for the suspension, there will be no tension.

## How do you find the angular position of a pendulum?

The angular position of a pendulum is represented by the equation θ=0. 0320cosωt, where u is in radians and ω=4. 43 rad/s.

## Does period of physical pendulum depend on mass?

The period of a pendulum does not depend on the mass of the ball, but only on the length of the string. Two pendula with different masses but the same length will have the same period. Two pendula with different lengths will different periods; the pendulum with the longer string will have the longer period.

## Is compound pendulum is physical pendulum?

The compound pendulum is also known as the Physical pendulum. R is the distance between the center of mass and pivot value.

## How do you find the length of a physical pendulum?

The period of a physical pendulum has a period of T=2π√ImgL T = 2 π I m g L . Use the moment of inertia to solve for the length L: T=2π√IMgL=2π√13ML2MgL=2π√L3g;L=3g(T2π)2=3(9.8ms2)(2s2π)2=2.98m. T = 2 π I M g L = 2 π 1 3 M L 2 M g L = 2 π L 3 g ; L = 3 g ( T 2 π ) 2 = 3 ( 9.8 m s 2 ) ( 2 s 2 π ) 2 = 2.98 m .

## What is moment of inertia of compound pendulum?

A compound pendulum is a body formed from an assembly of particles or continuous shapes that rotates rigidly around a pivot. Its moments of inertia is the sum the moments of inertia of each of the particles that is composed of.

## What are the laws of a simple pendulum?

According to the laws of simple pendulum. A simple pendulum’s period is directly proportional to the square root of its length. A simple pendulum’s period is inversely related to the square root of gravity’s acceleration. A simple pendulum’s period is independent of its mass.

## How many types of pendulum are there?

The various kinds of pendulums include the bifilar pendulum, the Foucault pendulum, and the torsion pendulum.

## What are the things to be considered in describing the motion of physical pendulum?

‘What are the things to be considered in describing the motion of a physical pendulum? The mass of the object, gravity and axis of rotation.

## What is the angle through which the pendulum oscillates between to maximum positions?

The correct option is B 120∘ A simple pendulum oscillates in a vertical plane. When it passes through the mean position, the tension in the string is 3 times the weight of the pendulum bob.

## How does mass affect a physical pendulum?

Physical pendulum Forces act through center of mass. Gravity acts through center of mass of the rigid body. Hence, length of pendulum used in equation is equal to linear distance between pivot and center of mass (“h”).

## What is point of oscillation in pendulum?

This point is located under the center of mass at a distance from the pivot traditionally called the radius of oscillation, which depends on the mass distribution of the pendulum.

## What is time period of pendulum?

Therefore, the time period of a simple pendulum is given by, T = 2π/ω0 = 2π × √(L/g)

## When the pendulum is at rest the position is called?

When the pendulum is at rest, not swinging, it hangs straight down. This position is called the “equilibrium position.” It is convenient to take this position as the reference position mentioned as the “origin” in the definition of position.

## When the pendulum is at the point of maximum displacement?

As the pendulum bob does the back and forth, there are times during which the bob is moving away from the equilibrium position. As it does, its height is increasing as it moves further and further away. It reaches a maximum height as it reaches the position of maximum displacement from the equilibrium position.

## When a swinging pendulum passes through its equilibrium position?

When a swinging pendulum passes through its equilibrium position its force diagram is momentarily balanced. 2. The speed of a wave depends on the properties of the medium it is traveling through, and on the amplitude of the wave.

## What factors affect the period of a pendulum?

The mass and angle are the only factors that affect the period of a pendulum.

## Why is pendulum period independent of mass?

The reason the simple pendulum has no dependence on mass is because the mass gets to “count” for two different things. (The same thing happens in freefall motion, where all things of all weights fall at the same rate.) Mass counts for inertia, or the “m” in “F=ma”.

## What is called compound pendulum?

A compound pendulum has an extended mass, like a swinging bar, and is free to oscillate about a horizontal axis. A special reversible compound pendulum called Kater’s pendulum is designed to measure the value of g, the acceleration of gravity.

## Why is it called compound pendulum?

Bar pendulum is called compound pendulum because a compound pendulum has extended mass, just like as a swinging bar. A bar pendulum is the simplest form of compound pendulum. It is in the form of a rectangular bar with holes drilled along its length at equal separation.