[Physics Tips] Do you know g and G?

student,

Welcome to another day of Physics Tips. Today's a short one - g vs G.

The acceleration due to gravity, -9.8 m/s² is widely used in introductory physics courses. This value describes how fast the velocity of freely falling object changes with time. This is a result of gravity.

For example, initially, an object to be dropped would have a velocity of 0 m/s. After 1 second of falling, it would have a velocity of -9.8 m/s. After 2 seconds of falling it would have a velocity of -19.6 m/s, etc. If you're confused by the negative sign, it will be mentioned later.

Also associated with gravity is the universal gravitational constant, G = 6.67x10^-11Nm²/kg². This is a constant used in the universal gravitation formula. These two commonly used values are both associated with gravity, but they definitely aren't the same or interchangeable.

In physics, each letter, representing a physical quantity, has different meaning with upper or low case, or greek. Be really careful!

Tip of the Day: g and G.

Keep it up with your study. "See" you tomorrow.

Meanwhile, Seize the Day!
Wayne Huang, PhD
http://www.RapidLearningCenter.com

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