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Questions and Answers
What is the unit of angular velocity?
What is the unit of angular velocity?
Which of the following describes periodic time?
Which of the following describes periodic time?
What provides the centripetal force needed to keep an object in circular motion?
What provides the centripetal force needed to keep an object in circular motion?
How does centripetal acceleration differ from linear acceleration?
How does centripetal acceleration differ from linear acceleration?
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Which option correctly identifies a source of centripetal force?
Which option correctly identifies a source of centripetal force?
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How do we know a string attached to a particle has gone slack?
How do we know a string attached to a particle has gone slack?
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In what situation does a particle moving in a loop experience a reaction force from the surface of the loop?
In what situation does a particle moving in a loop experience a reaction force from the surface of the loop?
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What force provides the centripetal force for a particle moving inside a loop?
What force provides the centripetal force for a particle moving inside a loop?
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What is one way to determine when a particle loses contact with the inside of a loop?
What is one way to determine when a particle loses contact with the inside of a loop?
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Why is it useful to find when the reaction force becomes zero when a particle is moving on a loop?
Why is it useful to find when the reaction force becomes zero when a particle is moving on a loop?
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Study Notes
Angular Velocity
- Angular velocity is the rate of change in angle with respect to time, measured in radians per second (rad/s) and represented by the symbol ω.
Periodic Time
- Periodic time is the time taken for one full revolution to occur, measured in seconds (s) and represented by the symbol T.
Centripetal Force
- Centripetal acceleration is the force responsible for keeping an object moving in a circular path, constantly changing direction.
- Centripetal force is directed towards the center of the circle and is the source of centripetal acceleration.
- Possible sources of centripetal force include:
- Tension
- Weight
- Reaction force
- Friction
String Tension
- String tension is continuously changing.
- If tension reaches 0, the string is said to have gone slack.
- A particle reaching the top of a string will cause it to go slack at that point if it only just reaches the top.
Particle Motion on Loops
- A particle moving on a loop experiences a reaction force with the surface.
- To find when a particle falls off a loop, determine when the reaction force becomes zero.
- The reaction force (R) acts opposite to the centripetal force when a particle moves on a loop.
- The reaction force (R) provides the centripetal force when a particle moves inside a loop.
- Another method to determine when a particle loses contact with the inside of a loop is to find when its speed becomes zero.
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Description
This quiz covers the concepts of angular velocity, periodic time, centripetal force, and acceleration in circular motion.
