Angular Momentum of Point Particle: The relation Z=1 only holds for a symmetric object rotating about its axis of symmetry. For a point mass traveling in a line, the angular momentum is 7=7 xp where is the vector from the axis of rotation to the particle and p = mv is the momentum of the particle. An astronaut of mass M travels with speed v, toward a spinning satellite of mass 10M and radius R which is rotating with angular speed. The astronaut grabs onto the edge of the satellite and holds on. The moment of inertia of a solid sphere of mass m and radius r through its center of mass is 2mr²/5. M 10M, R, Wo a. What is the magnitude and direction (in or out) of the angular momentum of the astronaut before the astronaut grabs onto the satellite? Take the axis of rotation to be at the center of the satellite and treat the astronaut as a point mass. Hint: although r and changes the lever arm will stay the same. Therefore, using the lever arm will be the easiest way to calculate the magnitude XP. b. What is the magnitude and direction (in or out) of the angular momentum of the spherical satellite before the astronaut grabs onto the satellite?
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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