Bennett Mechanical Test Structures and Center of Gravity 3

Question 1

A triangular shelf bracket transfers a load to the wall. Which member is typically in compression?

Accepted Answer

The diagonal brace

Answer

The diagonal brace pushes against the wall and is loaded in compression.

Question 2

Where is the center of gravity of a uniform L-shaped flat plate?

Accepted Answer

Outside the material of the L

Answer

For an L-shape, the center of gravity falls in the empty region between the arms, outside the material.

Question 3

A loaded wheelbarrow is easier to lift when the load is placed where relative to the wheel?

Accepted Answer

Directly over the wheel

Answer

Placing the load over the wheel lets the wheel bear most of the weight, reducing lifting effort.

Question 4

A balanced see-saw has a 40 lb child 4 ft from the pivot. Where must a 20 lb child sit to balance?

Accepted Answer

8 ft from the pivot

Answer

Balance needs equal moments: 40x4 = 20x8, so the lighter child sits 8 ft out.

Question 5

A flat tabletop rests on four legs. The combined center of gravity of the table is best described as?

Accepted Answer

Above the center of the tabletop

Answer

A symmetric table has its center of gravity centered above the middle of the top.

Bennett Mechanical Test Practice Test