motion in the universe Flashcards
W = ?
W = m x g
(Weight = mass x gravitational field strength)
m = ?
m = W/g
(mass = weight/gravitational field strength)
g = ?
g = W/m
(gravitational field strength = weight/mass)
what is the universe
a large collection of billions of galaxies
what is a galaxy
a large collection of billions of stars
where is our solar system?
in the Milky Way galaxy
why the gravitational field strength differs on different planets
because planets have different size, mass and density
how does the gravitational force causes moon to orbit planets
the gravitational pull attracts the moon. the gravitational force keeps the moon to orbit.
how does the gravitational force causes planets to orbit the sun
the gravitational force of the sun pulls the planet in orbit. The inertia of the planets makes the force unbalanced. which results in planets orbiting the sun.
how does the gravitational force cause artificial satellites to orbit the Earth
the gravitational force tugs on the artificial satellites which makes them orbit around the sun.
how does the gravitational force cause comets to orbit the sun
the gravitational force between them pulls the comet closer to the sun.
what is the difference in the orbits of comets, moons and planets.
a comet orbits the sun in a oval shape. planets orbit in. the moons orbit is little bit tilted.
orbital speed (v) = ?
v = 2πr/T
(orbital speed = 2π x orbital radius/time period)
what is force?
a push or pull upon an object resulting from the object’s interaction with another object
what is weight?
a force due to to the pull of gravity on an object
