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Circular motion
- Angular measure -
radians
- Angles are measured in radians;
length of an ark = radius x angle
(in radians)
- Radians are SI unit for the angle used
because of trigonometry, because
rotation is measured in radians per
second, and because it has no units
- Angles are measured in radians;
length of an ark = radius x angle
(in radians)
- Caused by change in velocity
at a constant speed
- Centripetal acceleration
- Given by:
- Causes centripetal
force, given by:
- Keeps planets in orbit of
the sun, satellites and the
moon in orbit of the earth
- Do not confuse centripetal
acceleration and force!
- Given by:
- Patterns of:
- Ball on a string
- Tension is centripetal force here
- Tension is centripetal force here
- Conical pendulum
- Ball on a string
- Gravitational fields
- Act towards the mass, idiot!
- Gravity is the
centripetal force here
- Newtons Law of Gravitation
- Definition: The gravitational force of attraction between two bodies is
proportional to the product of their masses and inversely proportional to
the distance between them. Adding in the gravitational constant, G, gives:
- Note a minus sign is needed to
show it is an attractive force
- Note a minus sign is needed to
show it is an attractive force
- Definition: The gravitational force of attraction between two bodies is
proportional to the product of their masses and inversely proportional to
the distance between them. Adding in the gravitational constant, G, gives:
- given by;
- Act towards the mass, idiot!
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