The reason why the force of gravity is F_g=-mg is because when a ball falls straight down with no air resistance, it accelerates at the constant rate a=-g.

Since this acceleration represents the total acceleration and comes from the net force (F_net=ma) that means F_net=ma=-mg. If you cancel out the masses, that leaves you with a=-g.

This topic, along with several more from forces, torque, and energy will be featured in Version 2 of my ‘Physics as a Science’ guide dropping in 4 days (read below for more)!

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4 Days Remaining: Physics as a Science (Version 2)!

The reason why you struggle in physics is because you don’t understand the science. You could easily compute basic equations like F=ma or W=Fdcos(θ) but if you run into a new problem you haven’t seen before, you’re screwed.

That’s why I’m releasing version 2 of my physics guide focusing on teaching you how to understand physics intuitively as a science 4 days from now so that you’ll never have to memorize a practice problem again since you understand the science very well.

Version 2 will feature every topic from version 1 (motion) along with over 600 pages of new topics including Newton’s laws, forces, center of mass, torque, and energy introduced in such a way that you could’ve derived these equations yourself. Down below are some of the slides featured in Version 2!

Make you purchase the guide on Monday, May 18th!

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Since you’re Here, check out my other offers to succeed in STEM!

The hardest part about math isn’t the raw calculations: it’s understanding what the math means when rearranging and graphing functions. Most students aren’t trained to interpret the math from a qualitative perspective which is why many students who are ‘good at math’ struggle in introductory chemistry, physics, and engineering courses.

That’s why I’ve created the Ultimate Algebra Guide for Science & Engineering Majors which covers all of the relevant concepts from algebra, trigonometry, and precalculus courses that are applicable for science & engineering majors condensed into a 700+ page guide! 

Check out the algebra guide here!