Gravity (Leaving Cert Physics): Flashcards

Product of masses; square of distance

$F = G\frac{m_1m_2}{d^2}$

$6.7 \times 10^{-11}$ N m² kg⁻²

4 times smaller

9 times smaller

$W = mg$

Mass = amount of matter (kg); Weight = force (N)

≈ 9.8 m s⁻²

Force per unit mass

$g = \frac{F}{m}$

N kg⁻¹ (newton per kilogram)

Min speed to escape celestial body's gravitational field

$v_e = \sqrt{\frac{2GM}{r}}$

≈ 11,200 m s⁻¹

No, independent of object's mass