Bennett Mechanical Test Force and Torque 4

Question 1

A force applied at 90° to a lever arm produces, compared to one applied at a slant, a torque that is:

Accepted Answer

Greater

Answer

A perpendicular force uses the full lever arm and gives the maximum torque.

Question 2

A bottle cap is hard to twist by hand but easy with a gripper that has a wide handle because the gripper:

Accepted Answer

Increases the lever arm and torque

Answer

The wider handle increases the radius, multiplying the torque for the same hand force.

Question 3

Two forces of 30 N each act in the same direction on opposite ends of a 1 m bar pivoted at center. The net torque is:

Accepted Answer

Zero

Answer

Same-direction forces on opposite sides of the pivot create opposing torques that cancel to zero.

Question 4

A mechanic uses a longer breaker bar instead of a short wrench mainly to:

Accepted Answer

Apply more torque with the same effort

Answer

A longer bar increases the lever arm, raising torque for the same applied force.

Question 5

A 50 N weight hangs 0.4 m from a pivot. What torque does it exert?

Accepted Answer

20 N·m

Answer

Torque equals 50 N × 0.4 m = 20 N·m.

Bennett Mechanical Test Practice Test