alleryStart learning →A wheelbarrow has its load at a perpendicular lever arm of 7.50 cm from the wheel axle and the hands at 1.02 m from that axle. What is its mechanical advantage?
A13.6
B0.074
C1.02
D7.50
Answer & Solution
Correct answer: A. 13.6
1. For a lever, MA = li / lo, the input lever arm divided by the output lever arm.
2. Here li = 1.02 m for the hands and lo = 0.0750 m for the load.
3. So MA = 1.02 / 0.0750 = 13.6.
4. A value well above one confirms the barrow multiplies the force the hands supply.
5. The value 0.074 is the inverted ratio, which would describe a machine that reduces force instead.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.5 Simple Machines_
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