Tides and planetary orbits are caused by the pull of gravity.

Effects of

**Mass**and Distance on Gravitational Force- The more massive an object, the greater it’s
**gravitational pull.** - The closer the distance between objects, the greater the gravitational pull
- The gravitational pull between the Sun and the planets and between Earth and its Moon cause distinct motions between and among these bodies

- The Sun’s gravitational attraction, along with the planet’s inertia (continual forward motion), keeps the planets moving in
**elliptical orbits**(Earth’s orbit is slightly oval) and determines how fast they orbit. - Planets nearer the Sun move/orbit faster than planets farther from the Sun because the gravitational attraction is greater.
- When a planet is farther from the Sun, the gravitational attraction between them decreases and the planet moves/orbits slower.

- Since the Moon is closer to Earth than the Sun (distance), the Moon has the greatest pulling effect on tides, the rise and fall of Earth’s waters.
- The Sun also pulls on Earth and can combine its force with the Moon causing even higher tides,
**spring tides**

- Or can be a right angles, pulling against the Moon’s pull, causing very little tidal change,
**neap tides****.**

## The **force of gravity** is influenced by both the __mass __and __distance__ of objects.

__mass__and

__distance__

## Investigate the relationship between the

force of gravity, mass, and distance

## How the force of gravity from the massive Sun effects the motion of celestial objects to move in elliptical orbits.

## How the force of gravity from the Moon and Sun effects Earth's tides.

What is gravity?

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