# P2 Forces & Elasticity OCR Gateway (9-1)

• Created by: Aleena
• Created on: 06-04-18 17:16
What are the 2 types of Deformations?
Deformations can be Elastic or Plastic
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How can an object be deformed by a force?
When an object is stretched,compressed or bent-when you apply forces on an object
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What is the least number of forces needed to deform an object?
two forces
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What is an Elastic Deformation?
When the object returns to its original shape after the forces are removed
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What is a Plastic Deformation?
When the object doesn't return to its original shape when you remove the forces
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What is the equation to find the force exerted by a spring?
Force exerted by a Spring (N) = Extension (m) x Spring Constant (N/m)
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Can this equation be applied to all elastic objects,not just springs?
yes
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Is the Extension inversely proportional to the Force?
no-they are directly proportional to eachother
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What factor determines the spring constant of a spring?
the spring constant depends on the material you're stretching-stiffer the material,larger the spring constant
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What is Hooke's Law?
The relationship between the extension of a spring & the force is called Hooke's Law
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What is the elastic limit?
The maximum force that can be applied to a material before it starts to deform plastically
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What happens to a spring when you go beyond its elastic limit?
It will deform plastically-no longer follows Hooke's Law
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What are Plastic Materials?
Materials that have a low elastic limit-you'll never normally see them deforming elastically
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How might the graph of force by extension look like for Plastic Materials?
it will non-linear=curved graph
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## Other cards in this set

### Card 2

#### Front

How can an object be deformed by a force?

#### Back

When an object is stretched,compressed or bent-when you apply forces on an object

### Card 3

#### Front

What is the least number of forces needed to deform an object?

### Card 4

#### Front

What is an Elastic Deformation?

### Card 5

#### Front

What is a Plastic Deformation?