Structures and Center of Gravity Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Structures and Center of Gravity flashcards as text
A triangular shelf bracket transfers a load to the wall. Which member is typically in compression?
Answer: The diagonal brace
The diagonal brace pushes against the wall and is loaded in compression.
Where is the center of gravity of a uniform L-shaped flat plate?
Answer: Outside the material of the L
For an L-shape, the center of gravity falls in the empty region between the arms, outside the material.
A loaded wheelbarrow is easier to lift when the load is placed where relative to the wheel?
Answer: Directly over the wheel
Placing the load over the wheel lets the wheel bear most of the weight, reducing lifting effort.
A balanced see-saw has a 40 lb child 4 ft from the pivot. Where must a 20 lb child sit to balance?
Answer: 8 ft from the pivot
Balance needs equal moments: 40x4 = 20x8, so the lighter child sits 8 ft out.
A flat tabletop rests on four legs. The combined center of gravity of the table is best described as?
Answer: Above the center of the tabletop
A symmetric table has its center of gravity centered above the middle of the top.
When stacking irregular rocks into a stable cairn, you should place the heaviest rocks where?
Answer: At the base
Heaviest rocks at the base keep the center of gravity low for stability.
A bridge arch carries load primarily through which type of internal force?
Answer: Compression
An arch carries its load mainly in compression along its curve.