# Lesson Plan: Surface Gravity Physics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to calculate the surface gravity of a planet or moon given its mass and its radius.

#### Objectives

Students will be able to

• understand that the acceleration due to gravity, , experienced by an object in the vicinity of a large object with mass is dependent on and the radial distance between the centers of mass of the two objects, ; so, ,
• use to calculate the acceleration due to gravity on the surface of a large body,
• understand that the acceleration due to gravity experienced by object in the vicinity of a large object is the same whatever the mass of .

#### Prerequisites

Students should already be familiar with

• Newton’s law of gravitation, ,
• Newton’s second law of motion, .

#### Exclusions

Students will not cover

• the gravitational field strength inside large objects,
• time-evolving systems,
• gravitational potential energy,
• gravitational potential.
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