They explore the effects of physical changes by cutting, bending, heating, freezing, and so on. Students learn to compare and contrast. For example, they compare the sizes and weights of various objects, sometimes finding that larger objects may weigh less than smaller objects. Matter is found all around us. From stars to dust, plants to animals, all things in our world and universe are made up of matter.
Some forces move matter, such as heat and sound.
Some forms of energy are closely related to matter, yet are usually not considered matter, such as light, radio waves, and X-rays. Matter has mass. This is the amount of matter, or material, that shows resistance to being moved. Some matter has little mass, like a small toy car that moves easily with a soft touch. Some matter has a large mass, such as a bulldozer which could not move with the push of a strong man.