Gravity - Dynamics | Show Me The Physics

Gravity - mutual force of attraction between any two objects in the universe

Warm-Up

Explain why the bottom stream is faster than the top.

Gravity by John Mayer II

Image found on Wikipedia

F = Gm₁m₂ r²

G = Gravitational constant = 6.67 × 10^-11 Nm²/kg²

(Reference Table p. 1)

m₁, m₂ — two masses

r — distance between center of masses

Giancoli p. 131 – #28 Giancoli practice problem 28

F = Gm₁m₂ r²

F_g proportional to product of two masses

F = Gm₁m₂ r²

F_g inversely proportional to the square of distance between the object's center of mass

Ex) If the gravitational force on satellite A is 160,000 N, what is the gravitational force on satellite B?

↓

F = 40,000 N

(twice distance, 1/4 the force)

Rank the gravitational forces from greatest to smallest.

How do we measure very tiny gravitational forces?

Determining G, Cavendish

Dark Matter