Steam-powered catapults, expensive and difficult ... its forward movement countered by reversing the push-pull electromagnetic forces of the two beams. The same energy is then used to return ...

Watch this video of a birthday party. There's a tug of war over a present and it shows how the push and pull forces work. Read this scenario and have a think about what may happen. The twins are ...

As students watch this clip they could be encouraged to call out or hold up a flash card to show if a push or pull force is being exerted in this real life example. Alternatively, screen shots ...