Machines can be used to move objects over distance. An object can be pushed or pulled to cause the object to change its motion. The push or pull needed to cause a change in motion of an object depends upon the weight of the object. The amount of change in motion of an object can be affected by the surface of the object and of the material the object touches. Objects on a uniform balance may or may not be in balance depending on the location of the support.
Energy can move from one object to another through materials and through space.
The amount of energy available from a force can vary. Solar System Students will learn about our solar system, including the nine planets and the sun. The planets revolve around our energy source, the sun. Each planet rotates, at different speeds, on its axis. There are four planets composed of gas and five planets composed of rock.