PS2A - Forces and Motion

Disciplinary Core Idea PS2A: Forces and Motion

Paul Andersen introduces forces, motion, and Newton's three laws in this video. He begins by describing forces as pushes or pulls on objects that produce motion. A lack of motion results from a balanced set of forces. A teaching progression K-12 is also included.

Intro Music Atribution
Artist: CosmicD
Creative Commons Atribution License

All images are either Public Domain or Creative Commons Attribution Licenses:

[Retrofire-]

Awesome, well-spoken explanation... thank you. I'm studying physics for game development and it's amazing how many possibilities open up once you understand it

[lucdunn]

At 3:17, this is a misleading trope, that the gravity pulling down on the book is an action force and the reaction force is the Normal Force holding up the book. That would mean the action and reaction forces act on ONLY the book. And if that's true of all forces, that a reaction force always acts on the SAME object and is equal and opposite, NO CHANGE IN MOTION would ever be possible.
Actually, the reaction forces are like this in this situation:

Action Force: Book pulled by Earth
Reaction Force: Earth pulled by book

Action Force: Book pushes on table
Reaction Force: Table pushes on book

I got that wrong my first few years teaching Physical Science as well, until I started teaching AP Physics and someone asked a good question.
The other examples you put up for Newton's Third are great, though.

[dougmiller]

WARNING: The example given of Newton's 3rd law (at 3:17) is incorrect.

[agogirl]

I really enjoyed that video! Thank you sir.

[Bozemanscience]

I use Keynote (a Mac alternative to Powerpoint) for the presentation and animations. The magic move transition workds great.

[kikogamez]

this is a good video about the 3 laws of newton.

[Descendants_Girl-m]

Thank you for helping me by making this video

[GuerrasLaws]

Physics test: “Without” applying the Energy from within you, choose an object of your choice, and apply only the Force or Net Force needed to push it away from you or pull it towards you. Please let me know if you’re able to. This is only a test. Thank you.

[jaydenaaron]

Thank u much I got an A+ on my test because of you

[BlimeyGeezaMate]

YES OMG YOU DO PHYSICS AHHHH IM SO HAPPY

[AAA-uzbs]

Hi, What program to you use for these presentations? I don't mean the screen recorder, I mean the powerpoint type thing you use. Also, what animation software is that? Is it in the presentation program?

[FrostKittyPaw]

Eventually you will have videos on everything in science o.o These videos are awesome! Thank you!

[ItzDjanelle]

yes do more physics videos! i love all your videos. :)

[toddwolfe]

Balanced forces equals 0.
0 eggs will produce 0 chickens.
Weight from air pressure plus relative density replace the need for gravity No forces equaling 0 are necessary.
Weight from air pressure is the downward force .
Just spitballing.

[arstgkneio]

need more physics! hope to see rotational motion some day!