2nd Grade Review Part Two Forces and Energy
Force A push or a pull that makes something move
Motion The act of moving people, animals, and things
Magnetism A force that pulls on some metals with a magnet Magnets are in things we use everyday
Gravity A force that pulls things towards the center of Earth
Friction A force that makes it harder to move things Smooth road-less friction-easier to move Rough road-more friction-harder to move
Measuring Motion Motion can be measured by how far, how much time, or how much force is needed to move something.
Energy The ability to cause change
Light Energy Energy that makes it possible to see matter and color
Heat Energy Energy that makes matter hotter or colder
Sound Energy Energy that you hear Made when objects vibrate Can travel through solids, liquids, and gases vibration
Vibrate To move back and forth very fast
How Sound Travels A person moves an object. The object vibrates. The vibration moves through air, liquid, or solid. A person hears the sound.
Loudness How loud or soft is the sound?