Chapter 16 Circular Motion Flashcards
What is a radian?
A radian is the angle which subtends an arc which has the same length as the radius of a circle.
What is the period of an object in circular motion?
The time taken to complete one oscillation.
What is the frequency of an object in circular motion?
The number of complete oscillations per unit time.
What are the equations of angular velocity?
ω = 2π/T
ω = 2πF
What is centripetal acceleration?
Centripetal acceleration is defined as the acceleration travelling in a circular path at constant speed.
What are the 2 equations linking a and r?
a = v²/r
a = ω²r
What is centripetal force?
It is defined as the net force acting toward the centre of a circle, which keeps an object moving in a circular path.
What are the 2 equations linking F and r?
F = mv²/r
F = mω²r
During circular motion why does the object have an acceleration but not an increase in speed?
The force acting on the object is perpendicular to the direction of motion and the direction of the object is constantly changing so acceleration is changing.
Definition of angular velocity?
The rate of change of angle. rads⁻¹
What in terms of force is necessary for an object to move in a circular path and at constant velocity?
Must have a resultant force acting towards the center of the circle perpendicular to the velocity.
