Awrench reduces the force needed to tighten a bolt. for this statement to be true, the wrench a. decreases the input force and decreases the input distance b. increases the input force and decreases the input distance c. increases the input force and increases the input distance d. decreases the input force and increases the input distance

D

Explanation:

Just looking at the physics of a wrench, it allows us to apply a turning force to an object. The reason a wrench is helpful is that it allows us to create a greater turning force, without necessarily changing the force applied to it.

Using the formula:

Fm = The moment of a force (the turning force)

F = The force applied

d = Distance from the fulcrum that the force is applied

Fm = F x d

This formula basically states that, if the moment of the force (output force) stays constant, then the force must decrease, if the distance increases.

Hence, the further away from the fulcrum that the force is applied (increase input distance), the less force needs to be applied (decrease input force).