Flashcards
Unit 6 - Circular Motion
Cards in this deck (15)
- 1Newton's first law of motionthe object will continue to travel in a straight line at a constant speed unless acted on by another force
- 2Newton's second law of motionfor zero acceleration that there is no net or resultant force
- 3For an object in circular motion, what applies to the direction and magnitude of velocity?the magnitude of the velocity is constant
However, the direction of the velocity changes - 4rThe angle subtended at the centre of a circle by an arc equal in length to the radius of the circle
- 5When the angle is equal to one radian, what applies to the length of the arc and the radius of the circle?the length of the arc (S) is equal to the radius (r) of the circle
- 6How to convert between degrees and radians
- 7Common degrees to radians (360, 270, 180, 80 into rad)
- 8Angular displacement definitionThe change in angle, in radians, of a body as it rotates around a circle
- 9Speed and velocity rotating in uniform circular motionAny object rotating with a uniform circular motion has a constant speed but constantly changing velocity. With velocity changing: it's accelerating (BUT SPEED STAYS CONSTANT)
- 10The angular speed, ⍵, of a body in circular motion is defined asThe rate of change in angular displacement with respect to time (a scalar quantity measured in rad s-1)
- 11Angular velocity- vector quantity measured in rad s-1
- Angular speed is the magnitude of the angular velocity
- The direction of the angular velocity vector points along the axis of rotation but depends on the direction of rotation
- 12Which one depends on the radius of the circle: angular or linear speed?The angular speed and velocity don’t depend on the radius of the circle
The linear speed does depend on the radius of the circle - 13Is an object moving in a circle in equilibrium?No, --> there is a resultant force acting on it (CENTRIPETAL FORCE)
- 14Centripetal force (F) definitionhe resultant force perpendicular to the velocity, and therefore directed towards the centre of the circle, required to keep a body in uniform circular motion
- 15—
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- Flashcards on Unit 6 - Circular Motion, created by Adeline Göttle on 06/11/2022.
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- Adeline Göttle
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