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Rotation Angle. When objects rotate about some axis—for example, when the CD (compact disc) in Figure rotates about its center—each point in the object follows a circular arc. Consider a line from the center of the CD to its edge. Each pit used to record
- Centripetal Acceleration
Example \(\PageIndex{2}\): How Big is the Centripetal...
- 5.11: Forces on Rotating Bodies
If we consider a disk that is free to rotate about an axis...
- Centripetal Acceleration
Problem-Solving Strategy for Rotational Dynamics. Examine the situation to determine that torque and mass are involved in the rotation. Draw a careful sketch of the situation. Determine the system of interest. Draw a free body diagram. That is, draw and label all external forces acting on the system of interest.
Step 1 – Mark a few points on a rotating disk and look at their instantaneous velocities as the disk rotates. Let’s assume the disk rotates counterclockwise at a constant rate. Even though the rotation rate is constant, we observe that each point on the disk has a different velocity.
We begin the study of uniform circular motion by defining two angular quantities needed to describe rotational motion. Rotation Angle. When objects rotate about some axis—for example, when the CD (compact disc) in Figure 6.2 rotates about its center—each point in the object
Consider a line from the center of the CD to its edge. In a given time, each pit (used to record information) on this line moves through the same angle. The angle of rotation is the amount of rotation and is the angular analog of distance. The angle of rotation Δ θ Δ θ is the arc length divided by the radius of curvature.
We begin the study of uniform circular motion by defining two angular quantities needed to describe rotational motion. Rotation Angle. When objects rotate about some axis—for example, when the CD (compact disc) in Figure 1 rotates about its center—each point in the object follows a circular arc.
