Practice Second Moment Of Area (moment Of Inertia) (7) - Mechanics of Beams

Practice: Second Moment of Area (Moment of Inertia)

Lesson 7Mechanics of Beams

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9 questions

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4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the formula for the moment of inertia of a rectangle?
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Think about the base and height of the rectangle.
Question 2.
Calculate the moment of inertia for a rectangular beam with dimensions 4 in (base) and 6 in (height).
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Use the standard formula.
3Question 3.
What is the Moment of Inertia for a circle with a diameter of 4 in?
- (π/32) * 4^4
- (π/64) * 4^4
- (π/2) * 4^4
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Recall the standard formula for circles.
4Question 4.
True or False: A larger Moment of Inertia indicates a beam is less resistant to bending.
- True
- False
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Think about what I represents.
Question 5.
A beam has a rectangular cross-section of 10 cm wide and 20 cm high. Calculate its Moment of Inertia about the neutral axis.
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Use the rectangle moment of inertia formula.
Question 6.
Determine the Moment of Inertia for a composite I-section beam where the flange is 5 cm wide and 2 cm thick and the web is 8 cm high and 1 cm thick. Calculate separately, then sum.
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Break down into flange and web, apply the rectangle formula.

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