physics rotational motion

kepler’s first law: law of orbits

all planets move around the sun in elliptical orbits

perihelion

closest to the sun and moving faster

aphelion

farthest from the sun and moving slower

kepler’s 2nd law: law of areas

the line joining the sun to a planet sweeps out equal area in equal times

kepler’s 3rd law

the square of the orbital period is proportional to the cube of the orbital radius

kappa(kepler’s constant) = r³/T²

periodicity

the time required for an object to complete a single cycle of motion (T)

frequency

(1/T) the number of occurences of a cycle of motion in a specified time interval

unit: [Hz] or [revolutions/time]

L

linear displacement

theta

angular displacement

in angular motion…

there are actually two accelerations which act on an object

• tangential acceleration

• perpendicular acceleration

when an object has only centripetal acceleration, but not tangential acceleration, the object is said to be undergoing…

UCM - uniform circular motion

non uniform circular motion

more than one acceleration and changing speed

Fc = mac

requirement for an object to be in circular motion

linear velocity is always..

tangential