| A | B |
|---|
| push or pull | force |
| strength of a force | magnitude |
| amount of matter in an object | mass |
| friction resists this | motion |
| every force has two properties: strength and this. | direction |
| buoyancy is produced by this | water |
| forces do this to the motion of objects | change them |
| pulls objects toward Earth | gravity |
| a force that resists motion | friction |
| water's upward push | buoyancy |
| friction can produce this | heat |
| measure of gravity's pull on an object | weight |
| what your feet would do without friction | slip |
| a force that comes from magnets | magnetism |
| gravity causes water levels torise and fall | tides |
| magnets are made of | iron, nickel, cobalt |
| walking on ice is hard because | there is no friction |
| astronauts are weightless in space | because there is no gravity |
| telephones, computers, and speakers contain | magnets |
| This reduces friction in a car's engine | oil |
