Physics 121- Quiz 4 and answers
verified to pass 2025
According to Newton's Second Law, in a two object system (e.g. star & planet,
or truck & person), the force on the smaller object is _______ the force on the
larger object. - correct answer ✔equal to
The reaction force to the Earth pulling on you is - correct answer ✔the force
of you pulling up on the Earth
Kepler determined that the planets orbit the Sun in ellipses with the Sun
located - correct answer ✔at one focus
A direct result of Kepler's 2nd Law is - correct answer ✔that planets move
slower when far from the sun
The relationship between the distance of a planet from the Sun and its orbital
period is given by - correct answer ✔Kepler's 3rd Law
If the distance between a star and a planet was suddenly cut in half, the
attractive gravitational force would ___. - correct answer ✔quadruple
The constant "G" is necessary to make Newton's Law of Gravity produce an
answer with the correct units. - correct answer ✔True
Both Newton's and Kepler's Laws allows us to: - correct answer ✔Predict the
behavior of bodies, compactly express relationships with words or equations
and calculate quantities within the laws, given the other quantities
