Universal Gravitation

Question 1

Newton’s Law of Universal Gravitation

Answer 1

every particle in the universe attracts every other particle in the universe with a force directly proportional to the product of their masses and inversely proportional to the distance between them

Question 2

Principle of Superposition

Answer 2

for several masses, the total effect is the sum of the individual effects

Question 3

Kepler’s First Law

Answer 3

all planets move in elliptical orbits, with the Sun at one focus

Question 4

Kepler’s Second Law

Answer 4

the radius vector drawn from a sun to a planet sweeps out equal areas in equal time intervals - consequence of angular momentum

Question 5

Kepler’s Third Law

Answer 5

the square of the orbital period of any planet is proportional to the cube of the semimajor axis of the elliptical orbit

Question 6

Aphelion

Answer 6

point on orbit furthest from Sun

Question 7

Perihelion

Answer 7

point on orbit nearest Sun