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Question 1

0votes

2answers

89views

Confusion in finding stress in accelerated body

On the left side, my teacher shows the method for finding stress on a small element dx of a rod. He treats the tension as the restoring force.However, my question concerns the diagram on the right ...

akshansh bansal

13

askedOct 31 at 17:51

Question 2

11votes

2answers

3kviews

If you're putting a rubber band around a sphere, when does it stay on?

A little while ago, I was fidgeting with a ball and some elastic bands, and I noticed that it seems like the elastic bands have to lie along a great circle (or near one) in order to not snap off.Is ...

Chair

119

askedOct 28 at 20:17

Question 3

3votes

0answers

98views

Possible Error in Pippard's "Cavendish Problems in Classical Physics": Extension of a wire under its own weight [closed]

I am going through Brian Pippard’s Cavendish Problems in Classical Physics and came across the following exercise:Calculate the extension under its own weight of a wire $10\,\mathrm{m}$ long ...

LandauFan

75

askedOct 7 at 20:30

Question 4

1vote

1answer

156views

Does this spring work with Hooke's law or not? [closed]

In the table is the data from the spring. In the y axis is the force in Newtons, and in the x axis is the extension in meters.Edit: I found out the reason why this spring did not work as initially ...

maneman

11

askedOct 6 at 10:58

Question 5

1vote

0answers

79views

Da Vinci bridge: why outer steps stay in place?

Consider Da Vinci's famous "boltless" bridge. (See image below*) Consider in particular an implementation with a significant 'arc', i.e. both ends start with a significant incline.How to ...

Hecatonchires

653

askedOct 3 at 9:26

Question 6

2votes

3answers

516views

Does the maximum amount of energy a spring can store depend on spring geometry?

I have two springs made from the same metal, one is a helical torsion spring, and one is a spiral watch spring.Both springs contain the same volume of metal in their active region.I wind up both ...

Rocketmagnet

1,424

askedSep 18 at 12:53

Question 7

0votes

0answers

87views

Visualising the twist produced in every segment of an axially loaded compression spring

My understanding of the mechanism of axially loaded compression springs:When loaded axially, a small twist is produced in every single element AB of the spring.To explain what I mean more clearly, ...

Sir Isaac Newton

43

askedAug 24 at 12:29

Question 8

0votes

0answers

74views

Intuitive view of structural metamaterials

A little bit of background here: I have a bachelor’s in chemistry and have broad interests in scientific topics but I am NOT a scientist. I can handle a mathematical explanation but not a specialist ...

GreenSonic98

1

askedAug 7 at 1:05

Question 9

3votes

1answer

199views

Finite Speed of Propagation for 2D Elastic Green's Function

$\newcommand{\RR}{\mathbb{R}}\DeclareMathOperator{\diag}{diag}$I'm working on deriving the analytic solution for wave propagation in an infinite homogeneous 2D linear elastic material, as a warmup for ...

Max Chien

135

askedJul 28 at 20:12

Question 10

-1votes

1answer

356views

For the stress-energy tensor, is there an analogue to Hooke's law for $\sigma_{ij}$?

Hooke's law for the Cauchy stress-tensor is:$$ \sigma_{ij} = \lambda u_{kk} \delta_{ij} + 2 \mu u_{ij} $$with the deformation tensor $u_{ij}$ which is calculated by $u_{ij}=1/2(\partial_iu_j + \...

AngBari

143

askedJul 22 at 21:06

Question 11

0votes

3answers

133views

What causes road resistance of a tire?

Road loss of a bicycle tire is usually explained as the work of deformation, as the leading edge continually deforms upon contact with the pavement; i.e. the tire flattens. However, at the trailing ...

Rich D

385

askedJul 14 at 21:07

Question 12

2votes

2answers

270views

How do you derive the speed of a transverse wave in a solid medium? [closed]

Before I start, yes I have read Speed of a transverse wave in a solid medium but I want a proof which is more elementary and intuitive that doesn't use the full tensor theory of elasticity.I couldn't ...

Mayo

326

askedJul 4 at 6:56

Question 13

7votes

3answers

2kviews

Why the upper section falls faster than the bottom section when the line is cut?

This question is from the book Problems in Elementary physics - Bukhovtsev et al. question number 78. It goes like this:A homogeneous cube is hanging from a line. The line is then cut. Which parts ...

hellofriends

257

askedJun 30 at 21:58

Question 14

6votes

3answers

2kviews

Why is the Young modulus of a gas "undefined"?

Various sources on Google state that the Young's modulus of a gas is undefined rather that zero. Why is this so?The Young's modulus(Y) of a material is defined as $$Y=\frac{\sigma \ (tensile \ stress)...

Mayo

326

askedJun 27 at 9:27

Question 15

0votes

0answers

39views

Understanding the mathematical definition of stress [duplicate]

I don't properly understand how this equation defines stress- $$\sigma=\lim_{\Delta A \to 0} \frac{\Delta F_{\rm internal}}{\Delta A}$$How does it relate to the intutive defination of stress-"...

Mohammad Formanul Islam

123

askedJun 26 at 11:17

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Questions tagged [elasticity]

Confusion in finding stress in accelerated body

If you're putting a rubber band around a sphere, when does it stay on?

Possible Error in Pippard's "Cavendish Problems in Classical Physics": Extension of a wire under its own weight [closed]

Does this spring work with Hooke's law or not? [closed]

Da Vinci bridge: why outer steps stay in place?

Does the maximum amount of energy a spring can store depend on spring geometry?

Visualising the twist produced in every segment of an axially loaded compression spring

Intuitive view of structural metamaterials

Finite Speed of Propagation for 2D Elastic Green's Function

For the stress-energy tensor, is there an analogue to Hooke's law for $\sigma_{ij}$?

What causes road resistance of a tire?

How do you derive the speed of a transverse wave in a solid medium? [closed]

Why the upper section falls faster than the bottom section when the line is cut?

Why is the Young modulus of a gas "undefined"?

Understanding the mathematical definition of stress [duplicate]

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