Bennett Mechanical Test Force and Torque 5

Question 1

A uniform plank rests on a pivot at its center. Adding weight to one end will cause that end to:

Accepted Answer

Tip downward

Answer

Extra weight creates a larger torque on that side, tipping it down.

Question 2

Which combination produces the greatest torque?

Accepted Answer

Large force, long lever arm

Answer

Torque is force times distance, so the largest force on the longest arm gives the most torque.

Question 3

A wheelbarrow makes lifting easier because the load sits:

Accepted Answer

Close to the wheel pivot, shortening the load arm

Answer

Placing the load near the wheel reduces its lever arm, so less effort is needed at the handles.

Question 4

If the net torque on a stationary object is not zero, the object will:

Accepted Answer

Begin to rotate

Answer

An unbalanced torque causes rotational acceleration, so the object starts turning.

Question 5

A bolt requires 18 N·m of torque. A wrench applies 90 N of force. What handle length is needed?

Accepted Answer

0.2 m

Answer

Length equals torque divided by force, so 18 ÷ 90 = 0.2 m.

Bennett Mechanical Test Practice Test