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If I jump backwards off a skateboard am I still travelling forwards? © iStock

If I jump backwards off a skateboard am I still travelling forwards?

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Riddle me this...

Asked by: Mike Miller, Malta

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As Einstein showed, it's all relative and depends on your own speed.

If you jump backwards from the skateboard more slowly than the skateboard's forward speed, then relative to a friend standing by watching, you'll still appear to be moving forward, as your jump hasn't cancelled out all your forward speed.

If, however, you jump at a higher speed than your forward speed, your friend will see you moving backwards.


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Authors

Robert is a science writer and visiting professor of science at Aston University.

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