View source for Types of Motion

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| [https://en.wikipedia.org/wiki/Linear_motion '''Linear Motion''']
| <span style="color:#B00000">
* Linear Motion is simply motion in a straight line. A measurement of [https://en.wikipedia.org/wiki/Speed '''speed'''] will provide its magnitude ''(i.e. how fast)'' but the term [https://en.wikipedia.org/wiki/Velocity '''velocity'''] gives both speed and direction ''(i.e. it is a [https://en.wikipedia.org/wiki/Euclidean_vector '''vector quantity'''])''</span>
| [[File:LinearMotionArrow.png|200px|right]]
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| [https://en.wikipedia.org/wiki/Rotation '''Rotational Motion''']
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* Rotational Motion  is motion around the circumference of a circle - like the drum of a tumbler dryer or washing machine. Rotational speed is normally measured in revolutions per minute ''(i.e. '''rpm''')'' but [https://en.wikipedia.org/wiki/Angular_velocity '''Angular Velocity'''] is usually measured in [https://en.wikipedia.org/wiki/Radian_per_second '''Radians per Second'''] ''(a complete revolution = 2π [https://en.wikipedia.org/wiki/Radian radians])''.</span>
| [[File:RotationalMotionArrow.png|200px|right]]
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| [https://en.wikipedia.org/wiki/Reciprocating_motion '''Reciprocating Motion''']
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* Reciprocating Motion is continuous linear motion and reversing in a straight line ''(e.g. as the motion of a piston in a '''[[Crank and Slider]]''' mechanism)''.</span>
| [[File:ReciprocatingMotionArrow.png|200px|right]]
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| [https://en.wikipedia.org/wiki/Oscillation '''Oscillating Motion''']
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* Oscillating Motion  is like the motion of a swing or pendulum swinging from side to side. The ends of '''[[Class of Lever|levers]]''' exhibit Oscillating Motion and this arc of movement has to be allowed for in the design of '''[[:Category:Linkages|Linkages]]''' otherwise the mechanism may jam or sieze.


* [https://en.wikipedia.org/wiki/James_Watt '''James Watt'''] overcame this problem by inventing a [https://en.wikipedia.org/wiki/Parallel_motion '''Parallel Motion'''] linkage for use in his early steam engines. This enabled the swinging end of a pivoted beam connect to the straight up and down motion of the piston rod</span>
| [[File:OscillatingMotionArrow.png|200px|right]]
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Linear and Rotational Motions may maintain a constant speed, or velocity, or may accelerate and slow down ''(i.e. decelerate or retard)''. Both Reciprocating and Oscillating Motions however, by their nature, must accelerate and decelerate during each cycle of operation ''(i.e. as the movement reverses)''. The pattern of acceleration ''(or deceleration)'' may exhibit different characteristics according to design requirements as follows:


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| [https://en.wikipedia.org/wiki/Velocity '''Constant Velocity (CV)''']
| <span style="color:#B00000">
* Constant Velocity occurs when a moving object continues to cover the same distance in equal periods of time - a metre in every second of time ''(ms<sup>−1</sup> in the [https://en.wikipedia.org/wiki/International_System_of_Units '''SI metric system'''])'' or a mile every hour ''(mph)'' for example.

* Constant Velocity is represented on a graph of distance against time, in a '''[[Displacement Diagram]]''' for example, by a straight sloping line</span>
| [[File:CV.png|250px|right]]
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| [https://en.wikipedia.org/wiki/Acceleration#Uniform_acceleration '''Uniform Acceleration and Retardation (UAR)'''] 
| <span style="color:#B00000">
* Uniform Acceleration and Retardation describes the movement of a ball thrown in the air for example. This motion is repesented by a '''[[parabola]]''' on the graph.</span>
| [[File:UAR.png|250px|right]]
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| [https://en.wikipedia.org/wiki/Simple_harmonic_motion '''Simple Harmonic Motion (SHM)''']
| <span style="color:#B00000">
* Simple Harmonic Motion  is defined as ''the projection of a point on the diameter as it moves around a circle with [https://en.wikipedia.org/wiki/Angular_velocity '''uniform angular velocity''']''.

* It is the motion of a [https://en.wikipedia.org/wiki/Pendulum pendulum] or [https://en.wikipedia.org/wiki/Spring_%28device%29 bouncing spring] and provides a very smooth transition between acceleration and retardation. 

* Simple Harmonic Motion is plotted on the graph using a [https://en.wikipedia.org/wiki/Sine_wave '''Sine Curve''']. </span>
| [[File:SHM.png|350px|right]]
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[[Category:Secondary]]
[[Category:Mechanisms]]