Chapter 16 - circular motion Flashcards
How many radians are there is 360 degrees?
2 pi
What are the SI units of angular velocity?
Radians per second.
What is the definition of angular velocity?
The rate of change of angle.
How do you calculate angular velocity from time period (T)?
Angular velocity = 2 pi / T
How do you calculate angular velocity from frequency (f)?
Angular velocity = 2 pi f
What is required for uniform circular motion?
A force that always acts perpendicular to velocity.
Why doesn’t a centripetal force do any work on an object in circular motion!
The force has no component in the dircetion of motion/is always perpendicular to motion.
How do you calculate linear velocity from the time period (T) of an object in circular motion?
v = 2 pi r / T
How do you calculate linear velocity from angular velocity?
v = angular velocity x radius
How is it possible for an object to experience an acceleration but travel at a constant speed?
If acceleration is perpendicular to velocity, the velocity will change direction whilst speed is constant.
What provides the centripetal force for a car turning a corner?
Friction from the road on the tyres.
What provides the centripetal force on the moon?
The gravitational attraction of the Earth.
Apart from friction what contributes to the centripetal force on a banked track?
The horizontal component of the normal reaction.
If a mass on a string is swung in a vertical circle where is the tension greatest?
At the bottom of the circle.
If a mass on a string is swung in a vertical circle where is the tension least?
At the top of the circle.
