How many forces are needed to compress, bend or stretch an object?
Multiple forces acting in different directions
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What is the relationship between force applied and extension of an elastic object?
The extension is directly proportional to the force applied
* as long as the limit of proportionality hadn't been passed
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What is the difference between elastic and inelastic distortion?
- Elastic deformation's effect on an object is temporary
- The object returns to its original shape when the force is removed
- Inelastic deformation's effect on an object is permanent
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What is the equation for force of an extension or compression?
Force = spring constant x (extension or compression)
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What energy is stored in a spring when it is stretched?
Elastic potential energy
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What is the equation for work done in stretching a spring?
Energy = 1/2kx^2
*k is spring constant
*x is extension
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What is a fluid?
A liquid or a gas
7 of 12
In a fluid, where do forces due to pressure act on a surface?
They act normal/ at a right angle to the surface
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What is the equation for pressure (of a solid)?
P = F/A
1 Pa is the same as 1N/m^2
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What is the equation of pressure in a liquid?
Pressure = column height x density x grav. field strength
P = hpa
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Why do objects in a fluid experience upthrust?
The pressure below it is slightly higher than the pressure above it so the force exerted is greater. This leads to an upwards force - upthrust
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What is upthrust equal to?
Upthrust = weight of the fluid displaced by the object
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Other cards in this set
Card 2
Front
What is the relationship between force applied and extension of an elastic object?
Back
The extension is directly proportional to the force applied
* as long as the limit of proportionality hadn't been passed
Card 3
Front
What is the difference between elastic and inelastic distortion?
Back
Card 4
Front
What is the equation for force of an extension or compression?
Back
Card 5
Front
What energy is stored in a spring when it is stretched?
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