Bennett Mechanical Comprehension Practice Test 2025 - Free Practice Questions and Review Guide

Question: 1 / 400

What is the calculated force needed to pull out a nail with a maximum force of 3000 N, positioned 5 cm from the turning point on a crowbar that is 0.80 m long?

1875 N

480 N

187.5 N

To determine the force needed to pull out the nail, we can utilize the concept of torque. The relationship between force, distance from the pivot (or fulcrum), and torque is given by the equation:

\[\text{Torque} = \text{Force} \times \text{Distance}\]

In this scenario, the torque generated by the force required to pull out the nail must equal the torque created by the maximum force acting at the nail (in this case, 3000 N) which is positioned a short distance from the pivot (5 cm or 0.05 m).

1. **Calculate the torque using the maximum force**:

The maximum force of 3000 N applied at 5 cm creates a torque that can be computed:

\[\text{Torque}_{nail} = 3000 \, \text{N} \times 0.05 \, \text{m} = 150 \, \text{Nm}\]

2. **Calculate the required force at the end of the crowbar**:

The full length of the crowbar is 0.80 m. To find the force (F) needed to achieve the same torque on the other side of

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3000 N

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