# physics 4

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Hooke’s Law
Density (r) is measured in kg m-3. It can be calculated using the equation below; density equation p=m/v
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Hooke’s Law
The extension of a spring or wire is directly proportional to the force applied provided the limit of proportionality is not exceeded.
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Stress
The stress applied to a material is the force per unit area applied to the material. The maximum stress a material can stand before it breaks is called the breaking stress or ultimate tensile stress.
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tensile
Tensile means the material is under tension. The forces acting on it are trying to stretch the material. Compression is when the forces acting on an object are trying to squash it.
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Strain
The ratio of extension to original length is called strain it has no units as it is a ratio of two lengths measured in metres.
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What is a modulus?
A modulus is a numerical value, which represents a physical property of a material .
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What is the Young Modulus?
It is the modulus of elasticity. This means it is a number which represents how easy it is to deform (stretch a material).
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youngs modular experiment
The Young Modulus for a wire can be measured using this equipment. The reference wire and test wire are hung from the ceiling. The reference wire supports a vernier scale which will measure the extension of the test wire.
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youngs modular experiment
) The original length of the test wire (L) should be measured with a tape measure.
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youngs modular experiment
2) The cross-sectional area (A) can be calculated from measuring the wires diameter with a micrometer. The micrometer should be used to measure the diameter at several different points along the wire.
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youngs modular experiment
3) The test wire will have several different forces (F) applied using the slotted masses and each time the extension of the test wire (DL) will be measured using the vernier scale.
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## Other cards in this set

### Card 2

Hooke’s Law

#### Back

The extension of a spring or wire is directly proportional to the force applied provided the limit of proportionality is not exceeded.

Stress

tensile

Strain