circular motion

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  • circular motion
    • scalers and vectors
      • scalers only have magnitude
        • speed
      • vectors have direction and magnitude
        • velocity
    • how
      • occurs when a body is moving at a right angle to a force that acts inwards on it.
        • e.g. satellite orbiting Earth
        • centripetal forces
          • gravitational
          • frictional
            • physical connection between centre of circle and object orbiting
              • tension
          • tension
          • electrostatic
    • types
      • perfect circle
        • e.g. ball on string being swung around
      • eliptical
        • e.g. Earth's orbit around sun
    • object constantly accelerating as it moves round, even if speed stays the same
      • newton's first law
        • objects remains in state of rest or uniform movement unless acted on by external force
          • would naturally move in straight line, but an external force is causing it to change direction
            • e.g. if ball on string was being swung round and the string was cut, ball would fly off at tangent to circle where the string was cut.
            • acceleration towards centre of circle
              • centripetal acceleration
                • centripetal forces
                  • gravitational
                  • frictional
                    • physical connection between centre of circle and object orbiting
                    • electrostatic
                • newton's second law- F=ma
                  • force = mass of object x centripetal acceleration
      • velocity of object =
        • 2 x pi x r/t

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