This module explains how gravity relates to both life on Earth and other objects in our solar system. Learn about important concepts such as acceleration, mass, orbits as well as some useful formulas relating to the topic of gravity.

Roller coaster rides are notorious for creating accelerations and g-forces. As a rider starts the descent down the first drop, she begins a one-minute adventure filled with various sensations of weightlessness and heaviness. The explanation for the various sensations experienced on a roller coaster loops is associated with Newton’s laws of motion. It is thought that Isaac Newton’s theories on gravity were inspired by seeing an apple fall from a tree.

  • Because of gravity, objects with mass are attracted to each other.
  • Gravity keeps Earth and the other planets in our solar system in orbit around the Sun. It also keeps the Moon in orbit around Earth.
  • Because Mars has a lower gravity than Earth, a person weighing 200 pounds on Earth would only weigh 76 pounds on Mars.
  • While Newton’s older law of universal gravitation is accurate in most scenarios, modern physics uses Albert Einstein’s general theory of relativity to describe gravity.

This module has eight lessons. Start to explore by clicking on Lesson one in the menu.