Circular Motion Flashcards
Motion in a vertical circle
If a car goes over a hill, what will cause it to lose contact with the track?
When v is too great and the normal contact force becomes 0
What is a conical pendulum?
When the mass moves in a horizontal circle but is supported by a cable that is at an angle to the vertical
What is the difference between motion in a vertical circle and motion in a horizontal circle?
The effect of the weight of the object on the resultant force towards the circle’s centre must be considered for motion in a vertical circle
What is the angular velocity?
The angular displacement per unit time
What is the frequency?
The number of revolutions per unit time
What is the centripetal force?
The resultant force acting towards the centre of the circle, e.g. Prevents a car on a roundabout skidding off at a tangent to its path
In a conical pendulum what provides the centripetal force? What balances the mass of the object?
- Centripetal force - horizontal component of the tension in the string or cable
- Mass of object balanced by the vertical component of the tension in the string or cable
What is the linear or orbital speed of an object moving in a circle?
The distance the object covers per unit time
In banked bends what does the centripetal force equal?
Nsinθ + Fcosθ - resultant force towards the centre
What is the time period?
The time taken for an object to turn through a complete circle
What is angular displacement?
The angle described by a rotating or orbiting object
What does Nsinθ equal in banked bends?
The component of the normal contact force acting towards the centre of the curve
In banked bends what does Fcosθ equal?
The component of the lateral friction force acting towards the centre of the curve
What is acceleration equal to?
The rate of change of velocity
What is the centripetal acceleration?
The acceleration of an object moving at a steady speed in a circle
