2399141
Description
Flashcards by Joe Kirkup, updated more than 1 year ago
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Created by Joe Kirkup
over 10 years ago
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| Question | Answer |
| What is a tensile force? | A tensile force, i.e. one producing tension, increases the length of the material on which it acts. |
| What is a compressive force? | A compressive force, i.e. one producing compression, will decrease the length of the material on which it acts. |
| What is a shear force? | Shearing forces are unaligned forces pushing one part of a body in one direction, and another part of the body in the opposite direction. They often cause a material to bend, slide, twist, crack or tear. |
| When is a material classed as being in a state of stress? | A material is classed as under stress when it undergoes an appliance of force in such a way that the material suffers a change of dimensions. |
| What is the unit of force? | The unit of force is Newtons. |
| What is the unit of stress? | The unit of stress is Pascals. |
| What is the equation to calculate stress? | The symbol used for tensile and compressive stress is σ (Greek letter sigma). |
| What is strain? | The fractional change in a dimension of a material produced by a force is called the strain. For a tensile or compressive force, strain is the ratio of the change of length to the original length. |
| What is the equation to calculate strain? | The symbol used for strain is ε (Greek epsilon). For a material of length L metres which changes in length by an amount x metres when subjected to stress, |
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