A push or a pull is a force. Forces can make things move, change their speed, or change their shape. We cannot see a force but we can see its effects. Look at this toy car. It isn’t going anywhere.

Scientists at St. Jude Children's Research Hospital used fluorescent imaging techniques to track the sequence of molecular events that kickstart the migration of developing neurons, implicating an ...

It won't move on its own so you need to help it along by applying a force. A force is always a push, a pull or a twist…so let's try each of them out!