# Astro-1 Unit-1 Review Notes.pdf - Astro 1: Astronomical...

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1.GravityNewton’s Laws1.An object at rest, or in motion in a straight line at a constant speed, will remain inthat state unless acted upon by a force.(example:If the Sun suddenly disappeared, the Earth would continue in thedirection that it was traveling in its orbit at that time.)2.The acceleration of a body due to a force will be in the same direction as the force,with a magnitude inversely proportional to its mass.Force=massxacceleration(or,F = m a )alternatively:a = F / m(A smaller mass will move faster, if the same force is applied to it.)3.For every action, there is an equal and opposite reaction.(The Sun exerts force on planets, and they orbit itthe planets exert equalforce on Sun, but it only moves slightly because of its very large mass relativeto the planets.)Surface Gravity on a PlanetThe strength of gravity,g, on the surface of a planet is given byg=M/R2whereMis the mass of the planet andRis its radius.Note the radius is squared butthe mass is not.

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Term
Spring
Professor
WANG
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