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Forces and Energy
Review for Test on Tuesday
Term | Definition |
---|---|
friction | a force that shows objects down. It always acts in the opposite direction of motion. |
gravity | a force that pulls objects together |
force | a push or a pull |
Newton (N) | the unit of force |
Isaac Newton | The scientist that wrote the 3 Laws of Motion which described gravity and the laws of motion. |
Balanced Forces | equal forces in opposite directions (Net force = 0 (n) |
unbalanced forces | unequal forces in opposite directions (Net force > 0 (n) |
rough surface | a surface texture that creates more friction (ex: carpet) |
smooth surface | a surface texture that creates less friction |
energy | the ability to make something move |
joule (J) | the unit for energy |
potential energy | stored energy in objects at rest |
kinetic energy | energy in moving objects |
the Law of Conservation of Energy | Energy cannot be created or destroyed. It can only change form. |