DT theory

Flashcards based on lecture notes about circuits, structures, mechanisms, and related concepts.

What are some examples of non-renewable energy sources?

Coal, oil, and gas

What is the key characteristic of non-renewable energy sources?

They are finite and can be polluting.

Give examples of renewable energy sources.

Solar, wind, and geothermal

What is a secondary energy source mentioned in the notes?

Batteries

In a series circuit, what remains the same throughout the circuit?

Current

In a series circuit, what happens to the voltage?

It splits

In a parallel circuit, what remains the same across all branches?

Voltage

In a parallel circuit, what happens to the current?

It splits

What is the prefix for 10^-12 and what is its value?

pico, 0.000000000001

What is the prefix for 10^-9 and what is its value?

nano, 0.000000001

What is the prefix for 10^-6 and what is its value?

micro, 0.000001

What is the prefix for 10^-3 and what is its value?

milli, 0.001

What is the prefix for 10^3 and what is its value?

kilo, 1,000

What is the prefix for 10^6 and what is its value?

mega, 1,000,000

What is the prefix for 10^9 and what is its value?

giga, 1,000,000,000

What is the prefix for 10^12 and what is its value?

tera, 1,000,000,000,000

Give an example of a frame structure.

Bridges and pylons

Give an example of a mass structure.

Dams and statues

Give an example of a shell structure.

Helmets and car bodies

How does triangulation reinforce structures?

Adds rigidity

What is laminating and how does it reinforce structures?

Layers glued for strength

How does corrugation reinforce structures?

Adds strength with less material

How does folding/bending reinforce structures?

Increases toughness

Give examples of man-made materials.

Steel, concrete, and plastic

Give examples of natural materials.

Wood, bone, and honeycomb

Give examples of suitable metal.

Steel and aluminum

Give examples of suitable wood.

Plywood and pine

Give examples of suitable plastic.

Polypropylene and ABS

Give examples of composite.

Fiberglass and carbon fiber

What is the formula for Moment (torque)?

Force x Distance (From pivot)

What are the units for Moment (torque)?

Newton meters (Nm)

What is the formula for Mechanical advantage?

Load / Effort

What is the formula for Speed?

Driven / driver

What is the effect of a larger driven gear?

Slower speed, more force

What is the effect of a larger driver gear?

Faster speed, less force

What do bearings do?

Reduce friction and support rotating shafts

What are some types of bearings?

Ball, roller, and plain

What is a cam?

A specially shaped part that rotates to move a follower

What is a follower?

The part that rests on the cam and moves in response to its shape

What is a camshaft?

The rod or shaft that the cam is attached to

Give an example of rotary motion.

Spinning in a circle, like a cam

Give an example of reciprocating motion.

Back and forth in a straight line, like a follower

Give an example of oscillating motion.

Swinging back and forth, like a pendulum

What is a dwell in the context of cams and followers?

When the follower stays still

What is a stroke in the context of cams and followers?

The distance the follower travels up and down

Pine

Lightweight, Treated for outdoor use, Furniture, Soft wood - not durable

Mahogany

Weather resistant, Durable, Rot resistant

Oak

Tough, Durable, Suitable for outdoors

Beech

Tough, Durable, Warps easily, Resists chipping and splitting - good for kids

Plywood

Strong, Durable, Warps easily, Resists chipping and splitting

MDF

Smooth surface to paint, Absorbs moisture easily

The 9 qualities of a product

Stable, Portable, Chemically resistant, Weather resistant, Waterproof, Easy to store, Ergonomically fit, Long-lasting, Durable

The 4 joints

Comb joint, Dovetail joint, Housing joint, Dowelled joint