study guide

Transportation

ADVANTAGE DISADVANTAGE

Boat/Ship/ROV most efficient needs water access

Truck/Car very convenient too much friction

Rail best land efficiency needs track

Plane - very fast in time can't carry too much / very expensive

Rocket – only way to space very expensive / can't carry too much

Sub-Systems of a Vehicle

BODY/STRUCTURE – Is the sub-system that holds all of the other sub-systems together.

PROPULSION – Is the sub- system dedicated to making the vehicle move. Transmission – distributes the propulsion in a power/speed ratio that benefits the situation.

SUSPENSION – Is the sub-system that holds the vehicle up, or in place while it moves. (a plane has two)

CONTROL – Is the sub-system that keeps the vehicle under a safe condition for operation.

GUIDANCE – Is the sub-system that steers the vehicle.

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Forces in Transportation

Drag: Fluid Resistance (gases and liquids)

Friction: Resistance offered by solids

Gravity: The force pulling everthing down to the earth's surface.

Heavier than air lift: getting flow and pressure so that it creates greater pressure on the bottom of a foil thus lifting an object up in a fluid.

Lighter than air lift: buoyancy.

Thrust: Action then Reaction.

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Newton's 3 Laws of Motion.

1. An object in/at motion/rest will remain that way unless acted upon by an unbalanced force.

2. F= M a or F/M=a

3. Every action has an opposite and equal reaction.

UNIVERSAL SYSTEMS

Goal(s), Input, Processes, Feedback, Output.