![]() ![]() Kolodner and her co-authors write, "Machines provide mechanical advantage to assist in moving objects. ![]() In their book " Moving Big Things (opens in new tab) ," Janet L. The other five machines all help humans increase and/or redirect the force applied to an object. Alternatively, a long handle can be attached to the axle to achieve a similar effect. If a wheel is attached to an axle, and a force is used to turn the wheel, the rotational force, or torque, on the axle is much greater than the force applied to the rim of the wheel. ![]() In addition to reducing friction, a wheel and axle can also serve as a force multiplier. – Perpetual motion machines: Working against physical laws ![]()
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