6.673X10^-11 Nm^-2kg²

6.673X10^-11 Nm²kg²

6.673X10^-11 Nm² kg^-2

6.673 x10^-11 N m^-2 kg^-2

combine into a larger mass.

attract each other.

create gravitational fields.

push each other apart.

a stronger force than the Moon attracts the Earth.

a weaker force than the Moon attracts the Earth.

the same force as the Moon attracts the Earth.

a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

20 N

40 N

80 N

160 N

Law of Universal Gravitation

Newton's First Law of Motion

My mother

Inertia & gravity

F=Gm₁m₂/r

F = Gm₁m₂/r²

F = Gm₁m₂/2r

F = m₁m₂/2r

mass and distance 

mass and matter

distance and weight 

weight and mass

4x bigger

4x smaller

2x bigger

2x smaller

orbit

ellipse

barycenter

precession

2F

1/2 F

4F

4F