Mechanics
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- Created by: Jade
- Created on: 09-01-13 15:29
Pico (p)
10^12
1 of 61
Nano (n)
10^-9
2 of 61
Micro (mew)
10^-6
3 of 61
Milli (m)
10^-3
4 of 61
Centi (c)
10^2
5 of 61
Kilo (k)
10^3
6 of 61
Mega (M)
10^6
7 of 61
Giga (G)
10^9
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Tera (T)
10^12
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Scalar Quantity
Has magnitude but no direction
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Vector Quantity
Has magnitude and direction
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Average Speed
A measure of the total distance travelled in a unit time
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Displacement
Distance moved in a gived direction
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Velocity
Displacement per unit time
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Intantaneous Speed
The speed as a given instant of time
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Acceleration
Rate of change of velocity
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Newton
One newton si the force that causes a mass of one kilogram to have an acceleration of one metre per second every second
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Weight
Gravitational force on a body
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Moment
The moment of force is the force multiplied by the perpendicular distance from a stated point
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Density
Is defined as mass per unit volume
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Pressure
Is defined as force per unit area
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Kinetic Energy (car safety)
Breacking force multiplied by the braking distance
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Joule
1 joule is the work done when a force of 1 newton moves its point of application 1 meter in the direction of the force
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Energy
Is the stored ability to do work
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Conservation of Energy
Describes the situation in any closed system, where energy may be converted from one form into another, but cannot be created or destroyed
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Kinetic Energy
Is the work an object can do by virtue of its speed
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Potential Energy
Regions where electric, magnetic, gravitational and nuclear forces exist. Regions such as this are known as fields
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Chemical Energy
Energy can be released when the arrangement of atoms is altered
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Internal Energy
The molecules in all objects have random movement and have some potential energy when they are close to one another, This type of energy is often called heat energy
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Nuclear Energy
Energy can be released by reorganising the protons and neutrons in an atom's nucleus. This form of energy is also know as atomic energy
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Gravitational Potential Energy
Is energy stored in an object by virtue of its position in a gravitational field
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Power
Is the rate of doing work
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Watt (W)
One watt (W) is equal to one joule per second
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Stress
Is force per unit cross-sectional area
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Strain
Is extension per unit length
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Acceleration of Free Fall (g)
The acceleration of a body falling under gravity
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Amount of a Substance
SI Unit measured in moles
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Breaking Distnace
The distance a vehicle travels while decelerating to a stop
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Brittle
A material that distorts very little even when subject to a large stress and does not exhibt any plastic deformation
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Centre of Gravity
The point at which the entire weight of an object can be considered to act
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Compressive Force
Two or more forces that have the effect of reducing the volume of the object on which they are acting, or reducing the length of the string
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Couple
Two forces that are equal and opposite to each other but not in the same straight line
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Crumple Zone
An area of a vehicle designed to increase the distance over which the vehicle decelerates and so reduce the average force acting
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Ductile
Materials that have a large plastic region
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Elastic Deformation
The object will return to its original shape when the deforming force is removed
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Elastic Limit
The pount at which elastic deformation becomes plastic deformation
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Extension
The change in length of an object when subjected to a tension
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Force Constant (k)
The constant of proportionality in Hooke's Law measured in newtons per metre
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Global Positioning System
A network of satellites used to determine an object's postition on the earths surface
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Hooke's Law
The extension of an elastic body is proportional to the force that causes it
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Moment of a Force
The turning effect due to a single force, calculated from the force multiplied by the perpendicular distance from a given point
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Plastic Deformation
The object will not return to its original shape when the deforming force is removed, it becomes permanently distorted
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Principle of Moments
For a body in rotational equilibruim the sum of the clockwise moments are equal to the sum of the anticlockwise moments
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Stopping Distance
The sum of the thinking distance and the braking distance
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Tensile Force
Usuall two equal and opposite forces acting on a wire in order to stretch it
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Tensile Stress
The tensile force per unit cross-sectional area
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Thinking Distance
The distance travelled from seeing the need to stop to applying the brakes
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Torque
The turning effect due to a couple measured in newton metres
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Turning Forces
One or more forces that if unbalanced will cause rotation
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Ultimate Tensile Strength
The maximum tensile force that can be applied to an object before it breaks
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Work (W)
The product of force and the distance moved in the direction of the force, it can also be considered as the energy converted from one form into another, measured in joules
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Other cards in this set
Card 2
Front
10^-9
Back
Nano (n)
Card 3
Front
10^-6
Back
Card 4
Front
10^-3
Back
Card 5
Front
10^2
Back
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