Circular motion Flashcards
Whats are the two formulas for angular speed?
w=theta/t=v/r where v is linear speed or tangential velocity.
What is angular speed?
It is defined as the angle rotated through per second.
What is the frequency of circular motion?
It is the number of complete revolutions per second.
What is the time period of circular motion?
It is the time taken for one complete revolution.
What is the formula for frequency/time period of circular motion?
w=2pi/T=2pif.
Why is an object in circular motion accelerating?
It is accelerating because it is changing direction.This centripetal acceleration is acting towards the centre of the orbit.
What are the two formulas for centripetal acceleration?
a=v^2/r=W^2xr
What is the formula for centripetal force?
F=mv^2/r and mW^2r.A centripetal force is required in order to keep an object in circular orbit.
What is uniform circular motion?
This is when an object is rotating at a steady rate.
How can you find the velocity of an object at a point in circular motion.
The velocity is just a tangent to the object at that point.
What does the centripetal force do?
It is a resultant force that changes the direction of motion so that the object stays in circular motion.The acceleration of an object is in the same direction as the resultant force being applied to it.
What direction is the centripetal force at relative to the object velocity?
It is at 90 degrees to the objects velocity so it does not do any work on the object.There is no displacement in the direction of the force.
