Grade 7 Science, Topic 5 - How Structures Fail Study Guide With Complete Questions And Answers.
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Course
FALI
Institution
FALI
What will happen if a great enough force acts on a structure? - correct answer The structure will begin to fail.
What is a lever? - correct answer A lever is a device that can change the amount of force needed to move an o...
What will happen if a great enough force acts on a structure? - correct answer The
structure will begin to fail.
What is a lever? - correct answer A lever is a device that can change the amount of
force needed to move an object.
What is the pivot called that is used in some types of levers? - correct answer
Fulcrum
Explain how the wind pushing against one side of a flagpole can act as a lever. - correct answer
The flagpole acts as a lever with the force of the wind pushing and bending the top of the pole. This
external force causes an internal force which pushes the pole at the bass in the opposite direction.
External forces can cause what in a structure? - correct answer Internal forces.
Each type of internal force can cause different kinds of what? - correct answer
Different kinds of damage.
Name 3 types of internal forces that can cause a structure to fail. - correct answer 1.
Shear
2. Bend and Buckle (which is a combination of tension and compression)
3. Torsion
Solid materials are never perfectly uniform. What flaw do they all contain? - correct answer
Microscopic cracks or weaknesses
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