Flashcards
Circular Motion
Flashcards do conjunto (11)
- 1Centripetal AccelerationAn object moving in a circle is always changing its velocity and therefore must be accelerating. If its speed stays constant, then the change in 'v' is caused only by a change in direction and the 'a' is called centripetal acceleration.
- 2Centripetal Force'a' is always caused by an unbalance force acting in the same direction. The unbalance fore that causes centripetal acceleration is called centripetal force.
- 3Centripetal Force (cont.)For 'F' to act as a centripetal force and cause centripetal acceleration, its direction must be at right angles to the direction of motion. A "Fc" will cause the motion to be circular and the direction of both the 'F' and the 'a' will be towards the centre of the circular path.
- 4Centripetal Force (Diagram)
- 5Equations.
- 6Horizontal Circular motion TheorySince 'm' is not moving in the vertical direction, the two vertical "F's" must be equal and opposite. The resultant force on 'm' is just the horizontal force. Since the resultant force acts towards the centre of the circle, it acts as a centripetal force, and causes the mass to move with circular motion.
- 7Banked CurvesFor a car/bike to drive around a bend, there must be sufficient centripetal force towards the centre of the circle. On a flat road, the centripetal force is provided by friction between the tyres and the road.
- 8Banked Curves (cont.)The centripetal force is usually provided by both the reaction force from the banking and the friction force. Making the banking steeper increases the 'v'. As the angle becomes larger, Fg itself is larger and so is the horizontal component, which provides the centripetal 'F'. The larger the centripetal 'F', the faster the max 'v'.
- 9Satellite Motion- Newtons Law of GravitationThe law states that any two objects are attracted by a gravitational force, Fg.
1)The size of the Fg depends on the 'masses' of the two objects (Fg is dir-prop to the 'm' of each object .
2) The distance between the two objects . - 10Equations of Satellite Motion.
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- FlashCards sobre Circular Motion, criado por rkever00 em 03-11-2015.
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- rkever00
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