A person sits in a chair that is free to rotate without friction. In their hands, they hold two masses: Mass m1 = 5.0 kg a distance r1 = 0.35m from their body and mass m2 = 3.0 kg a distance r2 = 0.75 m from their body.
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 person sits in a chair that is free to rotate without friction. In
their hands, they hold two masses: Mass m1 = 5.0 kg a distance r1 = 0.35m from their body and mass m2 = 3.0 kg a distance r2 = 0.75 m from their body.
Several modifications to the system are listed below.
a. Increase the mass of m1 e. Increase the distance r1
b. Decrease the mass of m1 f. Decrease the distance r1
c. Increase the mass of m2 g. Increase the distance r2
d. Decrease the mass of m2 h. Decrease the distance r2
i. None of these
Suppose the person begins rotating with a speed wi . Which modification(s) would result in…
MORE THAN ONE ANSWER POSSIBLE; LIST ALL THAT APPLY
i. The person spinning faster?
ii. The person spinning slower?
iii. The person changing the direction they are spinning?
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