Motocross Physics with Ryan Sipes - Smarter Every Day 30

zachawesomepudding Says:

Dec 29, 2011 - to make it simpler the wheel needs something to push off of and the bike is the pivot and wheel uses the pivot and the energy from the wheel is great enough to spin the wheel at the max rpm and then extra rotation and energy to spin the bike

ringer454 Says:

Dec 29, 2011 - Basically, yeah..

infinite5150 Says:

Jan 6, 2012 - hey man your videos are awesome! mabie sometime you could one of my beats on your video?? :) btw i always thought Dirtbikers just shifted their weight to move the bike in the air. its pretty nuts

tomdkkr Says:

Jan 7, 2012 - backbrake on the bike is near the right foot:P 1:25

The1PublicEnemy Says:

Jan 9, 2012 - as an mx rider i love this vid :D

shortsting24 Says:

Jan 16, 2012 - whats the outro song?!?!?!?! awesome vid btw #ThumbsUp

MrZombiekiller23 Says:

Jan 17, 2012 - smart rednecks

Gilmore2100 Says:

Jan 18, 2012 - cool video man I think I learned a lot.

Beesem Says:

Jan 23, 2012 - I'm a hearing instrument specialist. I'm so glad to see you say that! You're doing your future self a huge favour!

Infernostar18 Says:

Feb 14, 2012 - torque!!! the motor generated torque in the opposite direction, thus causing it to rotate the other way.

MrRoyalestCrown Says:

Mar 1, 2012 - Newton's Third Law. As the wheel spins faster, it tilts the bike's nose up because the rotation of the wheel increasing the air pressure on top of the wheel, forcing the back wheel down. When applying the brakes, the wheel is still and generates air pressure on the bottom of the wheel to tilt the nose down. Off of the top of my head ( I am a sophomore in highschool, 11th year).

mx4life757 Says:

Mar 5, 2012 - omg ur so smart u pointed at the clutch

zuke1624 Says:

Mar 12, 2012 - Not entirely accurate. These principles would still be in effect even in a vacuum. The reason the bike will pitch down is because of the momentum of the wheels. Both wheels have rotational velocity (rotational momentum) when he leaves the ramp. Now, if you slam on the front brake and that momentum doesn't just disappear, it transfers into something else. In this case it's transferring into the fork of the bike.

MrRoyalestCrown Says:

Mar 13, 2012 - Thank you for taking the time out of your day to make sure I understand. Happy Physics-ing!

alexchasewilliams Says:

Mar 21, 2012 - Could you explain how rotational energy is conserved? Pretty sure that tapping the brakes is converting some of that rotational energy into heat.

destinws2 Says:

Mar 21, 2012 - You are absolutely correct. I should have been more specific.

alexchasewilliams Says:

Mar 21, 2012 - @destinws2 Discovered your channel today, really enjoying the videos. Keep it up.

BubbaWatsonfan15 Says:

Apr 18, 2012 - Same with remote controlled cars. You can fly the car in the air pretty much. Front end is high = tap brakes and vice versa. Same prinicple applies. Very cool tho. Thanks for the upload

oxleymx238 Says:

Apr 24, 2012 - so if your air wheelying do you press the fornt brake to get it back level?Or he back brake? If using the back brake do you need to use the clutch ?Thanks

CryoInferno Says:

Apr 28, 2012 - You have inspired me to take up physics again.... got any recommendation books-wise for self learning?

Basiliskeye Says:

May 8, 2012 - When he revs the throttle, the rider uses the bike's engine to transform chemical energy (Petroleum) into heat and rotational kinetic energy, spinning the tire faster. This spin is transfered to the bike, rotating it backwards again. Thats my best try at decribing it anyways...

swiss93boy Says:

May 10, 2012 - "you tap your brakes" and points on the clutch xD

im18iswear1000 Says:

May 15, 2012 - destin could you do a vid on the physics of boats?

cheerdiver Says:

May 18, 2012 - Most riders use the rear tire, as it weighs more, having more effect. The rear brake is actuated by the right foot, on most. And, yes, using the clutch will help prevent the engine from stalling.