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Questions and Answers
What happens to a particle's angular momentum when it moves on a circular path with decreasing speed?
What happens to a particle's angular momentum when it moves on a circular path with decreasing speed?
- Angular momentum decreases (correct)
- Angular momentum remains constant
- Angular momentum increases
- Angular momentum becomes zero
When a particle moves on a circular path with decreasing speed, which direction is the acceleration?
When a particle moves on a circular path with decreasing speed, which direction is the acceleration?
- Acceleration is away from the center
- Acceleration is tangential to the path
- Acceleration is perpendicular to the path
- Acceleration is towards the center (correct)
What is the path of a particle moving on a circular path with decreasing speed?
What is the path of a particle moving on a circular path with decreasing speed?
- Elliptical path
- Spiral path with increasing radius
- Spiral path with decreasing radius (correct)
- Straight line path
When a particle moves on a circular path with decreasing speed, what happens to the direction of angular momentum?
When a particle moves on a circular path with decreasing speed, what happens to the direction of angular momentum?
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A point P on a rotating disc is twice as far from the axis as a point Q. How does their speed compare?
A point P on a rotating disc is twice as far from the axis as a point Q. How does their speed compare?
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Study Notes
Particle Motion on a Circular Path
- Particle moves on a circular path with decreasing speed, indicating a change in velocity.
- Angular momentum does not remain constant, as the speed is decreasing.
- Acceleration is towards the center of the circular path due to centripetal force.
Rotating Disc
- A disc rotates about an axis through its center and perpendicular to its plane.
- Point P on the disc is twice as far from the axis as point Q, indicating a difference in radial distance.
- Points P and Q have different velocities due to their varying distances from the axis of rotation.
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