Uniform Circular Motion

what is uniform circular motion (UCM)

constant uniform speed in a circular path

in UCM, what is constant and what is constantly changing

speed and velocity

when an object undergoes UCM, what does it experience and where is directed towards

acceleration, center of the object

any object travelling in a circle experiences

a net force directed to the center of the circle it is travelling

what is net force perpendicular to

the direction of motion of the object

where is net force directed to

parallel or tangential

in kepler’s law, what does a nearly circular orbit mean

the foci are close to each other

in kepler’s law, what does an elongated ellipse mean

the foci are far away from each other

what is kepler’s first law

every planet’s orbit is an ellipse with the sun at one of the focus points

what is kepler’s second law

the line that joins the sun and the planet sweeps out equal areas in equal amounts of time

what is kepler’s third law and what is ironic with it

the square of the orbital period is proportional to the cube of the orbital radius (goes against the first law)

what are tides

when the earth exerts a force on the moon that keeps it in orbit, but the moon exerts a force on the earth that is equal in size but opposite in direction to the force from earth