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46 Cards in this Set
- Front
- Back
How do you calculate a moment? |
Moment=Force×perpendicular distance (Nm=N×m) |
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What is the principle of moments? |
For an object to be in equilibrium the sum of the clockwise moments must exactly balance the sum of the anticlockwise moments. |
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Whats the difference between a vector and a scalar quantity? |
Vector quantity - magnitude and direction Scalar quantity- magnitude |
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What is suvat equation #1? |
V=at+u |
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What is suvat equation #2? |
S=1/2 (u+V)t |
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What is suvat equation #3? |
S=ut+1/2at^2 |
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What is suvat equation #4? |
V^2=u^2+2as |
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What is Avogadros constant and what is it defined as? |
6.02×10^23 mol^-1 It is the amount of atoms in one mole. |
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What is plancks constant? |
6.63×10^-34 Js |
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What is the speed of light? |
3.00×10^8 ms^-1 |
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What are the equations relating, Energy, Wavelength and frequency? |
E=h•f And C=f•wavelength (lambda) |
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What is the equation for density? |
P (rho)=M/V (measured in pascals/kgm^-3) |
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What is the equation for kinetic energy? |
K.E=1/2mv^2 |
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What are the conditions for a system to be in equilibrium? |
-The resultant force is zero -The net moment is zero |
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What is the equation for average speed (or velocity)? |
Distance (or displacement)/time |
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What does the gradient give on a displacement-time graph? |
Velocity |
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What does the gradient and the area under graph give on a velocity-time graph? |
Gradient - acceleration Area - displacement |
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What does the gradient and the area under graph give on a speed-time graph? |
Gradient - acceleration Area - distance |
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What does the area under graph give on a acceleration-time graph? |
Area - velocity |
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What forces are acting upon an object during freefall? |
Only gravity is acting upon the object |
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What are the 3 Newtonian laws? |
N1- an object will be at rest or constant velocity unless acted upon by an external force. N2- (sigma)F=ma if mass is constant N3- for every action force there is an equal but opposite reaction force |
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What do the terms Rough and Smooth mean? |
Rough- friction is to be considered Smooth- frictionless |
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What is the equation for momentum? |
P=mv (kgms^-1 / Ns) |
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What is the principle of conservation of momentum? |
The vector sum of momenta of the bodies in a system is constant, as long as there is no resultant force acting from outside the system. |
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What is the definition of an elastic collision? |
A collision where kinetic energy is conserved. |
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What is an inelastic collision? |
A collision where some kinetic energy appears to be lost. It is transferred to other forces. |
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What is the equation for work done? |
Wd=f•d (in direction of force) |
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What is the equation for potential elastic energy? |
Elastic p.e=1/2Fx |
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What is hookes law? |
F=kx |
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What is the principle of conservation of energy? |
Energy may not be created nor can it be destroyed, it can only be changed into other forms. |
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What is the equation for gravitational potential energy? |
Gravitational P.E= mgh |
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How do you realte work done to energy? |
Wd=change in energy |
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What are three equations for power? |
P=Fv P=Wd/t P=Energy transfer/t |
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What is stress calculated by? |
Its measured in pascals (Nm^-2) |
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What is strain calculated by? |
This is dimensionless. |
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How do you calculate young modulus? |
Measure in Nm^-2 or pascals |
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What are the 3 classifications of solid and an example of each? |
Crystalline - metal Amorphous - glass Polymeric - plastics |
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What is edge dislocation? |
It is an additional half-plane of ions in a crystalline solid |
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What is giga in terms of ×10^n? |
×10^9 |
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What is mega in terms of ×10^n? |
×10^6 |
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What is kilo in terms of ×10^n? |
×10^3 |
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What is deci in terms of ×10^n? |
×10^-1 |
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What is centi in terms of ×10^n? |
×10^-2 |
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What is milli in terms of ×10^n? |
×10^-3 |
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What is micro in terms of ×10^n? |
×10^-6 |
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What is nano in terms of ×10^n? |
×10^-9 |