chapter 4 Flashcards
what is the correct formula for the person’s weight F?
F = mg
If the distance between Earth and the Sun were cut in half, the gravitational force between these two objects would
increase by a factor of 4.
Between any two objects with mass, the force of gravity is always
attractive
If Earth were twice as massive as it is now, Earth’s gravitational force on the Moon would instead be ________ what it is now.
double
Two rocks (call them S and T) are a distance of 50 km from one another in otherwise empty space. Rock S has 20 times the mass of rock T. Considering only their mutual gravitational force, which rock will accelerate faster in response to gravity?
rock T
Suppose that you are suddenly transported to a planet with one-third of the mass of Earth but the same radius as Earth. Your weight would ________ by a factor of ________.
decrease; 3
If we wanted to increase the International Space Station’s altitude above Earth and keep it in a stable orbit, which of the following must also happen?
Its orbital speed will decrease.
Which of the following is true considering Newton’s laws of motion and Newton’s law of gravitation?
They can be used to produce Kepler’s three laws.
If you measured the orbital period of the Moon and the distance between Earth and the Moon, then you could calculate
the sum of the masses of Earth and the Moon.
when the Moon is between Earth and the Sun, ________ tides occur.
spring
the approximate amount of time between two high tides at a given location is about
12 hours.
The Moon always keeps the same face toward Earth due to
tidal forces from Earth.
When one object is tidally locked to the larger object that it is orbiting, it
rotates exactly once during each orbit.
Earth’s rotation rate is slowing because of
tidal forces from the Moon.
The distance between Earth and the Moon is increasing because of
tidal forces from the Moon.
When two galaxies get close to each other, long streams of stars can be observed. These “tails” are caused by
tidal forces.
