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Simple machines make work easier. Most simple machines reduce the amount of effort force needed to move an object. This cart has a set of wheels. The wheels are actually simple machines: the wheel and axle. How can we change these wheels to decrease the amount of effort force needed to move the wagon? A) Use a larger wheel and axle.

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MissPhiladelphia
For the answer to the question above asking  How can we change these wheels to decrease the amount of effort force needed to move the wagon?The answer is make the radius of the wheel larger in diameter. 
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Answer: C.

Explanation:  The ideal mechanical advantage of a wheel and axle is[[ Radius wheel/Radius axle]]. The larger the radius of the wheel, the greater the mechanical advantage.

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