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52 Cards in this Set
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Displacement 
Distance moved in a particular direction 

Speed 
Distance traveled per unit time 

Velocity 
Distance traveled in a particular direction per unit time 

Acceleration 
Rate of change of velocity 

Newton's first law of motion 
Every body will continue in it's state of rest, or with uniform velocity unless acted on by a resultant force 

Newton's second law of motion 
For a body of constant mass, it's acceleration is directly proportional to the resultant force applied on it 

Newton's third law of motion 
Whenever one body exerts a force on another, the second body exerts an equal and opposite reaction force 

Mass 
Measure of inertia of a body 

Weight 
Gravitational force exerted on an objects mass 

Force 
Rate of change of momentum 

Principle of conservation of momentum 
If no external force acts on a system, the total momentum of the system remains constant 

Elastic Collisions 
A collision in which both the total momentum, and the total kinetic energy of a system is conserved 

Inelastic Collisions 
A collision in which the total momentum is conserved, but total kinetic energy isn't 

Upthrust 
Resultant force on a submerged object due to the upward pressure of the fluid applied on it 

Center of gravity 
The point on an object at which the entire weight of the body seemingly acts 

Moment 
It is the turning effect of a force 

Torque of a couple 
The turning effect caused by two equal and opposite forces whose lines of action do not coincide 

The principle of moments 
The sum of the clockwise moments taken about any point is equal to the sum of the anticlockwise moments taken about the same point when a system is in equilibrium 

Energy 
Stored ability to do work 

Impulse 
It is the product of a force and the time during which the force is applied 

Work 
The product of a force and the distance moved in the direction of the force 

Power 
Rate of doing work 

Efficiency 
The fraction of the useful power output obtained from the total power input 

Density 
Mass per unit volume 

Crystalline 
The arrangement of the particles in the material are arranged in a regular 3D lattice with welldefined structures visible 

Amorphous 
(without form) No regular repeating structure of particles in the material 

Polymeric 
Composed of long regular molecule chains and cross linking of these chains Can undergo great strain and deform to a very great degree 

Ductile 
Undergo plastic deformation after considerable elastic deformation 

Brittle 
Does not exhibit any plastic deformation before breaking 

Ultimate tensile strength 
The maximum value of stress a material can withstand before breaking 

Pressure 
Perpendicular force per unit area 

Stress 
Perpendicular force per unit area 

Strain 
Extension per unit length 

Strain energy 
The energy stored in a body due to a change in shape 

Young's modulus 
Ratio of stress to strain  constant of proportionality 

Elastic deformation 
Temporary distortionmaterial returns to it's original shape on removal of the distorting force 

Plastic deformation 
When a small increase in stress causes a large increase in the strain 

Stress vs strain graphs (gradient and area under) 
Gradient=Young's modulus Area=Work done or energy 

Electric field 
Region of space where electric charge experiences a force 

Electric current 
Rate of flow of charged particles 

Ampere 
1 coulomb per second passing through an electrical component 

Potential difference 
Energy converted from electrical to other forms of energy when unit charge passed through it 

Volt 
The p.d. between 2 points in which one joule of energy is converted when one coulomb of charge passes 

Resistance 
Ratio of p.d. to current 

Ohm 
One volt per ampere 

Resistivity 
The resistance between opposite faces of a cute of the material, of unit length and unit cross sectional area 

Coulomb 
1 coulomb is the amount of charge required to maintain a current of one ampere 

Ohm's law 
The current through a conductor is proportional to the p.d. across it provided that it's temperature remains constant 

Thermistor 
A specific type of resistor, as temperature increases, resistance decreases 

Electromotive force (e.m.f.) 
Energy converted to electrical energy per unit charge 

Kirchhoff's first law 
The algebraic sum of the current at a junction is zero Related to the conservation of charge 

Kirchhoff's second law 
Around any closed loop in a circuit, the algebraic sum of the e.m.fs is equal to the algebraic sum of the p.ds Related to the conservation of energy 