physics exam 2 vocab

uniform circular motion

motion of an object traveling at a constant speed v on a circular path of radius r.

what does acceleration represent

change in velocity

ac= what

centripetal acceleration

period: T

time to complete one revolution

centripetal force

acceleration directed toward center, net force must be directed toward center as well.; name given to net force required to keep an object of mass m, moving at a speed v, on a circular path of radius r.

unbanked curve aka

flat surface

banked curve aka

incline

newtons law of universal gravitation

two point masses m1 and m2 separated by a distance r exert equal and opposite attractive forces on each other

center of mass

the gravitational force exerted by a uniform sphere is the same as if all the mass of the sphere were concentrated in its center

work

magnitude of the displacement times the component of the force along the displacement; only the component of the force parallel to the displacement matters

work is positive when

force has a component in the direction of motion

work is zero when

force has no component in the direction of motion

work is negative when

force has a component opposite to the motion