Express the given sentence in the

form of "The function of ..."

a. This action gradually raises the jack. The car is lifted from the ground.

b. A cam converts the rotary motion of the engine into the reciprocating motion

required to operate the valves.

c. The reciprocating motion of a piston is changed into a rotary motion by the

crankshaft

d. Springs exerts the more force the more they are stretched. This property provides a

way of measuring the force.

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