Have the students put the cars in a container on the top of the desk. Then discuss what they did to move their cars. Record their thoughts on the chalkboard. Discuss that they will be learning about force. Explain that force can change the speed or direction of a moving object in two way.
Force can either be a push force, or force can be a pull force.
Have them think of at least two ways they can use a push force. Let them experiment with their cars again. Emphasize that they are to be using a push force. Gain their attention again. Discuss their findings.