when an plant acid , physical matter is converted to mechanical matter & a place is a mean of plant ->  when a person moves, chemical energy is converted to mechanical energy  solids is a mean of moving & immune is a mean of colored ->  shivering is a kind of moving  shivering is a kind of moving & a place negative ->  the person moves when he is shivering  when a person moves, chemical energy is converted to mechanical energy & the person moves when he is shivering -> when a person shivers, chemical energy is converted to mechanical energy