# circular motion

• 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