Gravitation Flashcards
Geocentric theory
Ptolemy
Earth centre remaining all revolve around the eart
Helio centric theory
Copernicus
Centre sun remaining revolving around the sun
Tychohrehii
Father of solar system” sun”
1 st law of keplar
Law of orbit
All planets revolve around the sun in a elliptical orbit
Due to that seasons changes if in case in circular all seasons are same
2 nd law of keplar
Laws of area,
The areal velocities of all planets revolve around the sun are constant
A1=A2
Keplar 3 rd law
Laws of time period
T^2 proportional to d^3
The square of the time period of a planet revolving around the sun is directly proportional to the cube if the distance of the planet and the sun
Newtons universal gravitational law
Every body in the universe will attract every other body with a force f which is directly proportional to the product of their masses and inversely proportional to the square of the distance between the objects
G = 6.67* 10^ -11
Cavendish introduced value of g
If the masses of the object are doubled then what will be gravitational force
4 times
If the distance doubles
1/4
If the distance doubles
1/4
Distance and masses are doubled
No change
Masses double and distance half
16 times
Acceleration due to gravity
U initial velocity
Oka object visireyali ante kon tha velocity ivvali paiki velli malli kindaki vastadi akkada initial velocity zero avuddii
Freely falling body initial velocity zero, kani kindaki vachaka kuda initial velocity entho kontha untadi objects lo changes earth gravitational force valla jarugudii.
g value on earth 9.8
On moon 1.67
On sun 27.4
G value decreases
Increase of height
Increase of depth from the surface of the earth
is used to measure the g value
Gravity meter, gulf gravity meter, boliden gravity meter
Simple pendulum also used
What is g value at poles
Maximum at poles
Minimum at equator
Zero at centre of the earth
Mass and weigh
Mass is every where constant in the universe
The weight of the person maximum at poles because g value maximum at poles
The weight of the man in equator min
The weight of the man in centre is zero
Escape velocity for moon
2.38
Orbital velocity
7.9 to 8 km /s
Min velocity which satellite can be send to particular orbit
