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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
Vector |
Measurement with magnitude and direction |
Force, acceleration, velocity, displacement |
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Scalar |
Measurement with magnitude but no direction |
Time, mass, speed, distance, energy |
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Gravitational force |
W=mg, g=9.81 |
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Newton ' s first law |
A body at rest or travelling at a constant velocity will remain in that state unless acted upon by a resultant force. When resultant force is zero the body is in equilibrium |
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Newtons second law of motion |
The acceleration of a body is directly porportional to and in the direction of the resultant force applied on it. F=ma |
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Newtons third law |
If body A exerts a force on body B then body B will exert an equal force of the same type in the opposite direction on body A |
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Equations of motion |
Constant acceleration |
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First law of thermodynamics |
Energy cannot be created or destroyed. It is only transfered from one form to another |
Energy conservation |
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Work done |
Work done by a force is the energy transfered by the force on a moving body. If the force is constant: W=fd (distance moved in the direction of the force) |
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Density |
Mass per unit volume |
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Hookes law |
Provided the limit of proportionality is not exceeded, the extension of an elastic material is directly porportional to the applied force (tension/compression) F=kx |
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Elastic strain energy |
Energy stored in an object under deformation. Average force used Area under force strain graph E=0.5fx=0.5kx^2 |
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Young Modulus |
Measure of the stiffness of a material provided the limit of proportionality is not exceeded. E=stress/strain |
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Stress |
Stress=F/A |
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Strain |
Strain= extension/original length |
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Limit of proportionality |
Point of stress strain or force extension graph where graph stops being linear. Hookes law no longer obeyed |
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Elastic limit |
Max load where bday regains it's original size |
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Yield point |
Marked increase in extension for a small increase in stress. Plastic deformation occurs |
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Hysterisis |
Force extension graph for loading and unloading are different. Energy lost as heat |
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Creep |
When a material keeps extending over several minute even though a constant stress/force is applied. |
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Ultimate tensile strength |
Stress required to break a material under tension |
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Strong |
A large force/stress required to break it |
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Elastic behaviour |
Object returns to its original shape/size when the force is removed. |
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