ASVAB Mechanical Comprehension Practice Test 232840
Second-Class Lever
A second-class lever is used to increase force on an object in the same direction as the force is applied. This lever requires a smaller force to lift a larger load but the force must be applied over a greater distance. The fulcrum is placed at one end of the lever and mechanical advantage increases as the object being lifted is moved closer to the fulcrum or the length of the lever is increased. An example of a second-class lever is a wheelbarrow.
If the green box weighs 45 lbs. and 25 lbs. of force is applied 5 ft. from the fulcrum at the blue arrow, how far from the fulcrum would the green box need to be placed to balance the lever?
| 2.78 ft. | |
| 8.33 ft. | |
| 9 ft. | |
| 0.69 ft. |