Bennett Mechanical Test Force and Torque 2

Question 1

A 60 N force is applied to a wrench 0.5 m from the bolt. What torque is produced?

Accepted Answer

30 N·m

Answer

Torque equals force times distance, so 60 N × 0.5 m = 30 N·m.

Question 2

To loosen a stuck bolt with the least effort, where should you grip the wrench handle?

Accepted Answer

At the far end of the handle

Answer

Gripping farthest from the bolt increases the lever arm, producing more torque for the same force.

Question 3

Two children sit on a seesaw. A 40 kg child sits 2 m from the pivot. Where must a 20 kg child sit to balance it?

Accepted Answer

4 m from the pivot

Answer

Balance requires equal torques, so 40×2 = 20×d gives d = 4 m.

Question 4

Which unit measures torque?

Accepted Answer

Newton-meter

Answer

Torque is force times distance, measured in newton-meters (N·m).

Question 5

A force applied straight through the axis of rotation produces how much torque?

Accepted Answer

Zero

Answer

A force passing through the pivot has no lever arm, so it creates no turning effect.

Bennett Mechanical Test Practice Test