Gravitational Field Introduction

The gravitational field is introduced and illustrated. For a constant field and a non-constant field around a spherical object.
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0:00 The two force of gravity equations
0:55 The constant gravitational field equation
2:25 Gravitational Field Lines
3:16 What is a gravitational field?
4:33 The gravitational field equation around a spherical object
5:48 Drawing the field lines around a spherical object
7:02 Are gravitational field lines real?

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