# Gravitation

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More Lessons for High School Physics
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A series of free Online High School Physics Video Lessons.

In this lesson, we will learn

- Newton's Law of Universal Gravitation
- Gravitational Fields
- Ocean Tides
- Black Holes

### Newton's Law of Universal Gravitation

Newton's Law of Universal Gravitation says that everything with massive particle in the universe attracts all other massive particles. This force is called gravity.

The force of gravity = universal gravitational constant (mass of one particle × mass of other particle) / (distance between the two particles)

^{2}.

Applying Newton's Law of Universal Gravitation

A brief introduction to Newton's Law of Universal Gravitation for high school students.

### Gravitational Fields

Gravitational fields are vector fields that show forces of gravity around a large object. A gravitational field pulls all surrounding objects towards the center of mass but pulls the matter at the center of mass of the object outward.

A brief introduction to gravitational fields for beginning high school students.

Understanding and predicting gravitational fields.

### Tides
Ocean

Tides are the rising and falling of the sea due to variations in the gravitational pull of the moon on opposite sides of the Earth. Tides are a type of wave with regular frequencies and periods which echo the motion of the moon.

Explains ocean tides and tide books

What Causes Tides

Black Holes

Black holes are formed when extremely large star dies. When a star dies, it first expands, then contracts. Large stars contract until their atoms collapse, pulling the electrons into the nucleus. The immense strength of the gravitational force of a black hole pulls all nearby matter in, even light (which has mass).

How black holes work.

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