| A | B |
|---|
| force | a push or pull |
| gravity | the pull of the earth on all objects |
| magnetism | force magnets have to pull on objects made of iron or steel |
| weight | determined by the amount of gravity's pull on an object |
| spring scale | instrument used to measure force and weight |
| newtons | amount of force needed to pull or lift an object |
| poles | ends of a bar magnet |
| attract | pull toward each other |
| repel | push against each other |
| Isaac Newton | scientist who studied and named gravity |
| arch | type of bridge supported from underneath by curved supports |
| suspension | type of bridge which hangs from steel cables |
| girder | a type of bridge made of steel beams called girders |
| cantilever | bridge made from two beams, each supported at only one end which meet in the middle |
| truss | type of bridge strengthened by many triangular sections |
| cylinder | a strong shape for supporting weight |
