why did Newton think that a force must act on the moon
the moon orbits the earth
What did newton conclude about the force that brings apples to the ground and the force that holds the moon in orbit
gravity
If the moon falls why doesn't it get closer to the earth
satalittes fall around the earth
what is meant by tangental velocity
the velocity of a salattlie
since the planets are pulled around the sun by gravitational attraction why don't they crash into the sun
has to have a minimum Tangental velocity
What does the very small value of gravitational constant G tell us about the strength of gravitational forces
gravity is considered a weak force
what are two masses and one distance that equals your weight
your mass would be m1 the planet would me m2 and the dstance bewteen you is the radius
In what way in gravity reduced with distance from the earth
you want to increase you distance
what makes the earth go round
gravity
The earth and the moon are gravitationally attracted to each other does the more massive earth attract the moon with the greater force the same or less that the moon attracts the earth
Equal but opposite
If the gravitational forces of the sun of the planets suddenly disappeared in what kind of paths would the planets move
tangent to the path
which requires more fuel a rocket going from the earth to the moon or a rocket coming from the moon to earth
it is harder t to go away from the earth
we can think of a field force as a kind of extended aura that surrounds a body spreading its influence to affect things. As later chapters will show you an electric field affects electric charges and magnetic fields effect magnetic poles what does a gravi
mass
upon what quantities does the acceleration of gravity on the surface of various planets depend on
constant mass and the radius
how does the gravitational field surrounding earth vary with increasing distance
decreases
what is the value of the gravitational force at the center of the earth
0m/s/s
Which for pair is greater that between the moon and the earth or that between the sun and the earth
the sun and the earth
which is more effective in raising ocean tides the moon or the sun
the moon
what are two major factors that determine the size of a star
gravity and fusion
why would the earth not become a sun if it got sucked into a black hole
black holes still have mass
If the earth was the same size but twice as massive how would the value of G change if at all?and how would the value g change at all
it wouldnt big G stays the same it is a constant little g double
If the radius of earth somehow shrunk by half without without any change in earths mass what would the value of g be at the new surface
increases by 4 times as much
how does the direction of motion satellite in circular orbit compare with the curve of earths surface
equal
What is Keplers first law of planetary motion
elipses
does the period of satellite increase or decrease as its distance from the earth increases which of Keplers laws does not support
increases
Where in an elliptical orbit is the speed of statllite maximum minimum which of keplers three laws does this support
when it is the closest,when it is farthest away
2nd law
does the speed of a satellite around the earth depend on mass ?its distance from the earth? the mass of the earth ?
no yes yes
if you stopped an earth satellite dead in its tracks it would simply crash into the earth why then don't the communication satellites that hover motionless above the same spot on earth and not crash
they have the same time or same period