14. Two blocks of masses 300.0 g (m,) and 150.0 g (m,) are connected by a string which is placed over a pulley supported by a rod. The pulley can rotate freely about its center without friction and it has a radius of 20cm. The system is released from rest, 1.2s later it has an angular speed of 12.6 rad/s. (I) Draw a free-body diagram for each block, and for the pulley. (II) What is the pulley's angular acceleration? (III) What is the acceleration of the blocks? (IV) What are the tensions in the string on either side of the pulley? (V) What is the net torque exerted on the pulley? (VI) What is the moment of inertia of the pulley? m, m,
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.
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