A student performed an experiment to prove the angular momentum conservation experiment using a rotating disk experiment. In this experiment a disk of mass =1kg and radius 1m was rotated initially at a speed of 40rot/s. While it was rotating, an identical disk was dropped on the top. By using conservation of angular momentum find the rotation speed of the combined system. Hint: Rotational Inertia of the disk of mass m and radius r is I=(1/2)mr2. Conservation of angular momentum,I1w1=I2w2 where I1 is the initial inertia of the disk and w1=40rot/s,I2=2I1.Solve for w2
Angular Momentum
The momentum of an object is given by multiplying its mass and velocity. Momentum is a property of any object that moves with mass. The only difference between angular momentum and linear momentum is that angular momentum deals with moving or spinning objects. A moving particle's linear momentum can be thought of as a measure of its linear motion. The force is proportional to the rate of change of linear momentum. Angular momentum is always directly proportional to mass. In rotational motion, the concept of angular momentum is often used. Since it is a conserved quantity—the total angular momentum of a closed system remains constant—it is a significant quantity in physics. To understand the concept of angular momentum first we need to understand a rigid body and its movement, a position vector that is used to specify the position of particles in space. A rigid body possesses motion it may be linear or rotational. Rotational motion plays important role in angular momentum.
Moment of a Force
The idea of moments is an important concept in physics. It arises from the fact that distance often plays an important part in the interaction of, or in determining the impact of forces on bodies. Moments are often described by their order [first, second, or higher order] based on the power to which the distance has to be raised to understand the phenomenon. Of particular note are the second-order moment of mass (Moment of Inertia) and moments of force.
A student performed an experiment to prove the
Hint: Rotational Inertia of the disk of mass m and radius r is I=(1/2)mr2.
Conservation of angular momentum,I1w1=I2w2 where I1 is the initial inertia of the disk and w1=40rot/s,I2=2I1.Solve for w2
Step by step
Solved in 2 steps with 2 images
