???? ?????:??? ????? ???? ?????? ????????? ?? ??????? ?????? The shape in the getting in touch with surfaces of the cam and follower decides the motion on the mechanism. Wheel: The wheel is an important early machine, including the chariot. A wheel uses the law on the lever to lessen the pressure required to overcome friction when pulling a load.

 ????? ??? ?????? ?????? ???? ?? ??? ?????? ????? ??? ?????? ????? ?? ???? ?? ????? ????? ?? ????? ??? ??? ???? ?????? ???????. ??? ???? ???????? ???? ?????? ??????? ?????????? ????? ???? ?????? ??????? ??????. ?????? ???? ????????! ?? ??????? ??????? ?? ??? ???????! ?????? ????? ?????? ???? ??? ???? ????? ? ??????????? ???? ????? ?????? ??