Here is a small animated video that reinforces the concept to go along with the Force of Motion unit.
This week in Ms. Britton's class our project deals with force, acceleration, and motion! The students had to realize that it takes a force to produce motion. Motion maybe changed if resistance (inertia) is present. We used marbles and insulation material to construct rollercoasters to apply the concepts. The following day we designed catapults using paper cups, rubber bands, craft sticks, plastic spoons, and balloons. The students were able to explain the concepts using vocabulary from the unit and they had a blast!!