4 Physics Puzzles from Veritasium

Here are 4 physics puzzles involving rotation.  See if you can figure them out without looking at the answers.


A Great Time to Observe Mars

Hello all, I just wanted to put up a short post to let you know that now is a great time to observe the planet Mars.  This is because Mars and Earth are in their closest approach these next couple of days with May 22nd being the best day (see figure below from NAOJ).


Mars Closest Approaches from 2014-2027 from the National Astronomical Observatory of Japan.

This would be a great time to pull out a small telescope or binoculars to get a glimpse of the Red Planet.  A great summary of how to observe mars is here at Cosmic Pursuits.  Below is an image of where Mars will be in the sky for the next few nights from NASA.


Mars in the Night Sky from NASA/JPL.

One last thing, you may get an e-mail message claiming that Mars is going to be as big as the Moon in the sky, DON’T BELIEVE IT!  If Mars was close enough to Earth to be as big as the Moon we would all be in trouble!  No one is quite sure where this hoax started but it seems that someone got mixed up between Mars being as BRIGHT as the Moon, and being as BIG as the Moon back at the closest approach in 2003.  And every August since then the hoax seems to make a comeback.


Go enjoy Mars and keep looking up!


Transit of Mercury

Today’s post is not really a science prompt but more of an announcement.  This Monday, May 9th, 2016, Mercury will pass between the Earth and the Sun.  This happens about 13-14 times a century so it is a relatively rare event.  I am hoping to pull out a couple telescopes to view this but it looks like it is going to rain here on that day.  If you want to view it you will need a system with at least 30x magnification since the planet Mercury is so small but make sure you VIEW THE SUN SAFELY.  Go here to see how to view the transit safely.  If you cannot view the transit from your location it will be broadcast online by both the NASA Solar Dynamic Observatory and by Slooh Observatories.  Watch the video from Science@NASA below for more information.  Enjoy!


A Handyman’s Lesson in Center of Mass

I came across this great idea from Scientific American.  Check it out and see if you can come up with similar projects to try out.

Brick vs. Tennis Ball: An example of what a science prompt can become

This video was posted recently by the YouTube channel Stand Up Maths where a simple apparatus of a brick and tennis ball tied together leads to the derivation of centripetal force.  The math in this video is a little high but this is the sort of thing I would love to see in a science prompt.

  1. Start with a simple set-up.
  2. Ask a straight-forward question.
  3. Seek the answer.

Here is the video:

By Own work - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4973453

At Home Particle Detector

Using materials you probably have lying around the house and some dry ice you can detect high-energy particles coming from elsewhere in the cosmos.

What  you need

  • large clear container (a fish tank works well, or for a smaller scale detector use a jar)
  • a sponge
  • 91% rubbing alcohol

The two videos below give the instructions for building this project.  Enjoy!




The image at the top of this post is by Own work – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4973453.

The Amateur Scientist


The Kitchen Centrifuge (instructions are here)


Ok, so this isn’t a normal science prompt but I wanted to post this for those who might be interested.  If you are looking to go deeper in your science endeavours, check out the old column from Scientific American called “The Amateur Scientist.”  This column gives instructions for building high-energy particle detectors, rocket fuel, homemade grappling hooks, and dredge nets.  There is a little bit of everything here but these are more advanced (and sometimes more dangerous) projects.  Check it out, even if you don’t actually do the projects I think it is worth the read.  It will give you a better appreciation for how science is done.

Unfortunately, the Society of Amateur Scientists seems to have shut down but there is still a Facebook page you can check out.