Suppose a bicycle wheel is rotated aboutan axis through its rim and parallel to its axle. (a) Is its momentof inertia about this axis greater than, less than, or equal to itsmoment of inertia about its axle? (b) Choose the best explanationfrom among the following:I. The moment of inertia is greatest when an object is rotatedabout its center.II. The mass and shape of the wheel remain the same.III. Mass is farther from the axis when the wheel is rotated aboutthe rim.
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.
Suppose a bicycle wheel is rotated about
an axis through its rim and parallel to its axle. (a) Is its moment
of inertia about this axis greater than, less than, or equal to its
moment of inertia about its axle? (b) Choose the best explanation
from among the following:
I. The moment of inertia is greatest when an object is rotated
about its center.
II. The mass and shape of the wheel remain the same.
III. Mass is farther from the axis when the wheel is rotated about
the rim.
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