tag:techtv.mit.edu,:Array/220011440 2008-09-02 15:54:18 -0400 MIT Department of Physics Technical Services Group A ball is dropped in front of a meter stick and lit by a strobe light. A long exposure photograph captures the position of the ball at each evenly spaced flash of light. The acceleration of the ball can then be measured from the photo. <br><br> Note that the frame rate of the video capture (30fps) is quite close to the strobe rate (15Hz). This is why the strobe flashes in the slow motion video don't appear to be exactly evenly timed. <br><br> See the <a href="http://www.flickr.com/photos/physicsdemos/3174207211">final image</a> on Flickr. 42 tag:techtv.mit.edu,:Array/219990660 2007-12-28 10:14:37 -0500 Doc Edgerton Films Watch this silent film with descriptive boards of a demonstration on the velocity of light as performed by Doc Edgerton and some of his assistants. 92 tag:techtv.mit.edu,:Array/219969880 2009-06-18 13:08:48 -0400 MIT Department of Physics Technical Services Group A cart moving at constant velocity shoots a ball straight upwards. Since the ball has the same translational velocity as the cart, it is caught when it comes back down. 68