Newton's third law is: For every action, there is an equal and opposite reaction.
For an educational display I want to make a demonstration aparatus. I was thinking of a platform to stand on - and a pad on the wall to push against. The pad on the wall could be something like a bathroom scale - I then need something to measure the opposing reaction of the platform.
Obviously - low friction. Idealy giving a digital display to compare with the reading on the scales.
Any ideas for hardware?