light travels in a straight line
mirrors
transparent: allows most light to pass through
translucent: allows some light to pass through
opaque: do not allow light to pass through
shadow can ONLY be formed by translucent or opaque object
heat V temperature
heat: form of energy
temperature: measurement of degree of hotness
heat flows from hotter → cooler
| heat | termperature | object |
|---|---|---|
| gain | increase | expand |
| lose | decrease | contract |
precautions against expansion and contraction:
winter → temp decrease → heat loss → contract
gain heat → expand
good(metals) & poor conductors of heat