The radius of the sphere is 20.0 cm and has mass 1.0 kg. The rod has length 0.5 m and mass 2.0 kg. (c) Flywheel mass and radius should both be much greater, allowing for a lower spin rate (angular velocity).Find the moment of inertia of the rod and solid sphere combination about the two axes as shown below. The radial acceleration at the edge of the disk is > 50,000 gs. Because the force is perpendicular to r, an acceleration \boldsymbol$$ (b) This angular velocity is very high for a disk of this size and mass. To develop the precise relationship among force, mass, radius, and angular acceleration, consider what happens if we exert a force F on a point mass m that is at a distance r from a pivot point, as shown in Figure 2. If you push on a spoke closer to the axle, the angular acceleration will be smaller. The more massive the wheel, the smaller the angular acceleration.
The greater the force, the greater the angular acceleration produced. Force is required to spin the bike wheel.
There are, in fact, precise rotational analogs to both force and mass. These relationships should seem very similar to the familiar relationships among force, mass, and acceleration embodied in Newton’s second law of motion. The first example implies that the farther the force is applied from the pivot, the greater the angular acceleration another implication is that angular acceleration is inversely proportional to mass. Furthermore, we know that the more massive the door, the more slowly it opens. For example, we know that a door opens slowly if we push too close to its hinges. In fact, your intuition is reliable in predicting many of the factors that are involved. If you have ever spun a bike wheel or pushed a merry-go-round, you know that force is needed to change angular velocity as seen in Figure 1.
Study the analogy between force and torque, mass and moment of inertia, and linear acceleration and angular acceleration.Understand the relationship between force, mass and acceleration.
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