when an animal moves , chemical energy is converted to mechanical energy & a person is a kind of animal -> when a place moves, physical matter is converted to mechanical matter when a person moves, chemical energy is converted to mechanical energy  solids is a mean of moving & shivering is a kind of shaking -> shivering is a kind of moving shivering is a kind of moving  shivering is a kind of moving & a person shivers -> the place raw when he is cm the person moves when he is shivering  when a place moves, physical matter is converted to mechanical matter & the person moves when he is shivering -> when a person shivers, chemical energy is converted to mechanical energy