Rubone of your palms on a metal surfacefor soe time, say 30-40s. Place the otherpalm on an unrubbed proption of the surfaceand thenthe rubbedportion of the metalsurface .The rubbed protion will fellwarmer . Nowrepeat the sameona wooden surfaceis largerthan thatof themetal surface .Why ?

Rubone of your palms on a metal surfacefor soe time, say 30-40s. Place

1.	Rubone of your palms on a metal surfacefor soe time, say 30-40s. Place the otherpalm on an unrubbed proption of the surfaceand thenthe rubbedportion of the metalsurface .The rubbed protion will fellwarmer . Nowrepeat the sameona wooden surfaceis largerthan thatof themetal surface .Why ?
Answer» SOLUTION :Metalsare goodconductorsof heat . Heatgenerateddueto rubbing of palm spreads rapidlyfrom rubbedregions tootherregionsof themetal SURFACE . Woodon the otherhand is a bad CONDUCTOR . Theheatgeneratedat the rubbedregion can notmoverapidlyto otherareasof the WOODEN surface . Hence rubbed andunrubbed regions exhibita distinct temperaturediffernece .