a. Gravitational constant (G) and acceleration due to gravity (g)
|It is the force of attraction between 2 bodies of mass 1 kg each kept at the distance of 1m between their centers.||It is the acceleration produced on freely falling bodies due to the influence of gravity.|
|It is a constant value.||It is a variable value.|
|Its unit is Nm2/kg2.||Its unit is m/s2.|
b. Gravity and gravitational force.
|It is the force of attraction by which any body is attracted toward the center of any heavenly body from its surface.||It is the force of attraction by which the two different heavenly bodies are attracted to each other with a certain force.|
c. Gravity and acceleration due to gravity.
|Gravity||Acceleration due to gravity|
|It is the force of attraction by which any body is attracted toward the center of any heavenly body from its surface.||It the acceleration produced on a freely falling body due to the influence of gravity of any heavenly body.|
d. Mass and weight.
|The total amount of matter contained in any body is called mass.||The gravity acting on any body of a certain mass is called weight.|
|It depends upon the size and number of atoms present in the body.||It depends upon the mass and value of acceleration due to gravity.|
|Its SI unit is Kg.||Its SI unit is Newton (N).|
e. Freefall and Weightlessness.
|When a body is falling freely under the influence of gravity only, it is called freefall.||It is the state of any body having zero weight.|
|It is one of the causes of weightlessness.||It is one of the effects of freefall.|