Question

second and third class levers are differentiated by __________. a. the location of the fulcrum b. the location of the load c. the presence of multiple loads d. the type of fulcrum present please select the best answer from the choices provided. a b c d

Explanation:

To differentiate between second and third - class levers, we analyze the components of a lever: the fulcrum, the load, and the effort. In a second - class lever, the load is between the fulcrum and the effort (for example, a wheelbarrow, where the load of dirt is in the middle, the fulcrum is the wheel, and the effort is applied at the handles). In a third - class lever, the effort is between the fulcrum and the load (for example, a broom, where the effort is applied by the hand in the middle, the fulcrum is the hand at the top, and the load is the dirt at the end of the broom).

• Option A: The location of the fulcrum is not the differentiating factor between second and third - class levers. In both, the fulcrum is at one end (in the case of a wheelbarrow and a broom - like lever, the fulcrum is at one end).
• Option B: As explained above, the location of the load (relative to the fulcrum and the effort) is what differentiates second and third - class levers. In second - class, load is between fulcrum and effort; in third - class, effort is between fulcrum and load (so load is at the other end relative to the effort's position in second - class).
• Option C: The presence of multiple loads is not a characteristic that differentiates second and third - class levers.
• Option D: The type of fulcrum (fulcrums are generally the same in terms of the "type" relevant here, like a pivot point) is not a differentiating factor.

Answer:

B. the location of the load