Uploaded by Jason Kwak

Physics 2 Chapter 10 Review

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O000188 – Physics 2: Vibration, Waves and Thermodynamics
1st year of Joint Section Bachelor of Science in Environmental
Technology, Food Technology and Molecular Biotechnology
Chapter 10
The conditions for equilibrium
๏‚ท For an object to be at rest, Newton’s second law states that the sum of the forces
must add up to __. This is the first condition of equilibrium.
o Σ๐น๐‘ฅ = ___, Σ๐น๐‘ฆ = ___, Σ๐น๐‘ง = ___
๏‚ท For an object to be at rest, the net torque applied must be added to __.
o Σ๐œ = ___
๏‚ท In other words, the net force and net torque must equal __.
Stability and balance
๏‚ท _____: The object returns to its original position.
๏‚ท _____: The object moves farther from its original position.
๏‚ท _____: The object remains in its new position.
Elasticity; Stress and strain
๏‚ท Elasticity and Hooke’s Law
o ๐น = __ ∗ __
๏‚ท Youngs Modulus
o โˆ†๐‘™ = _____
o The Elastic moduli is same/different for different materials.
๏‚ท Stress and Strain
๐น๐‘œ๐‘Ÿ๐‘๐‘’
o Stress = ๐ด๐‘Ÿ๐‘’๐‘Ž = __
o Strain =
๏‚ท
๐‘โ„Ž๐‘Ž๐‘›๐‘”๐‘’ ๐‘–๐‘› ๐‘™๐‘’๐‘›๐‘”๐‘กโ„Ž
๐‘œ๐‘Ÿ๐‘–๐‘”๐‘–๐‘›๐‘Ž๐‘™ ๐‘™๐‘’๐‘›๐‘”๐‘กโ„Ž
= __
Relationship between Youngs Modulus, Stress, and Strain
๐‘†๐‘ก๐‘Ÿ๐‘’๐‘ ๐‘ /๐‘†๐‘ก๐‘Ÿ๐‘Ž๐‘–๐‘›
๐น/๐ด
o ๐ธ = ๐‘†๐‘ก๐‘Ÿ๐‘’๐‘ ๐‘ /๐‘†๐‘ก๐‘Ÿ๐‘Ž๐‘–๐‘› = โˆ†๐‘™/๐‘™
0
Tension, Compression, and Shear Stress
๏‚ท When a rod is being stretched, it is under _____ stress.
๏‚ท When a rod is being “squashed”, it is under _____ stress.
๏‚ท When a book is being pushed parallel to the ground, it is under _____ stress.
๏‚ท Shear Modulus
๐‘™ ๐น
o ๐บ = โˆ†๐‘™0 ๐ด
๏‚ท
Bulk Modulus
โˆ†๐‘ƒ
o ๐ต = − โˆ†๐‘‰/๐‘‰
0
Fracture
๏‚ท Safety factor
o If the safety factor for Aluminum is from 5 to 10, the actual stress on the
structure should not exceed _____ to _____.
Arches and Domes
๏‚ท Arches and Domes are special ways to span a space that allow the ____ to be managed
well.
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