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All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Engineering Engineering groups

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Search the community's STEM library — free to study, yours to make your own.

Engineering

Circuits, mechanics, materials and design on openstem — flashcards, notes, quizzes, sketches and flowcharts shared by the community. Study free, or clone anything into your library.

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Engineering: explore STEM content (page 17 of 27) · openstem

Flowchart18 objects

Engineering

Engineering · L3 · Phone Stand Design Process

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Engineering · L3 · Phone Stand Design Process

Quiz6 questions

A pump boosts water pressure by 49,000 Pa. Using ρ = 1000 kg/m³ and g = 9.8 m/s², what head does this represent?

A2.5 mB5 mC10 mD25 m

Engineering

Engineering · L3 · Pumps & Head Quiz

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Engineering · L3 · Pumps & Head Quiz

Flowchart10 objects

Engineering

Engineering · L1 · Ramps & Wedges: Sloped Simple Machines · flowchart

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Engineering · L1 · Ramps & Wedges: Sloped Simple Machines · flowchart

Quiz4 questions

What does it mean if a material is 'flexible'?

AIt can bend without breakingBIt is see-throughCIt never gets wetDIt is very heavy

Engineering

Engineering · L1 · What Are Materials? Quiz

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Engineering · L1 · What Are Materials? Quiz

Flowchart5 objects

Engineering

Engineering · L3 · Pumps, Head, and Matching a Pump to a Job · flowchart

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Engineering · L3 · Pumps, Head, and Matching a Pump to a Job · flowchart

Collection5 items

01Engineering · L3 · Capacitors & Energy Storage

02Engineering · L3 · Capacitors & Energy Storage

03Engineering · L3 · Charging and Discharging a Capacitor

+2 more

Engineering

Engineering · L3 · Capacitors & Energy Storage

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Engineering · L3 · Capacitors & Energy Storage

Flashcards9 cards

What is specific strength, also called the strength-to-weight ratio?1 / 9

A material's strength (often its yield stress) divided by its density. It tells you how much load-carrying capability you get for every kilogram of material — not just how strong the material is outright.

Engineering

Engineering · L3 · Specific Strength Concepts

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Engineering · L3 · Specific Strength Concepts

Flashcards9 cards

What is the basic rule for force multiplication in a hydraulic system?1 / 9

The pressure is equal on both sides, so force out ÷ area out = force in ÷ area in. Rearranged: force out = force in × (area out ÷ area in).

Engineering

Engineering · L2 · Hydraulics — Force Multiplication by the Numbers

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Engineering · L2 · Hydraulics — Force Multiplication by the Numbers

Collection5 items

01Engineering · L3 · Project Scheduling

02Engineering · L3 · Project Scheduling

03Engineering · L3 · Project Scheduling

+2 more

Engineering

Engineering · L3 · Project Scheduling

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Engineering · L3 · Project Scheduling

Quiz6 questions

What is an electrical conductor?

AA material that lets electricity flow through it easilyBA material that blocks electricity completelyCA tool used to measure electricityDA type of battery

Engineering

Engineering · L1 · Conductors & Insulators Quiz

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Engineering · L1 · Conductors & Insulators Quiz

Quiz10 questions

In a closed-loop control system, what is the error signal e(t)?

AThe output of the plantBThe difference between the setpoint and the measured output: e = r − yCThe integral of the control signalDThe noise from the sensor

Engineering

Engineering · L4 · Control Systems — 10 Q

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Engineering · L4 · Control Systems — 10 Q

Note~370 words · 2 min

Putting a number on "good insulator" Insulation resists heat flow. But "resists heat" is useless for sizing a furnace or checking a building code. R-value is the number: higher R means a given thickness resists heat flow better. Bigger area

Engineering

Engineering · L3 · R-Value & Thermal Resistance

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Engineering · L3 · R-Value & Thermal Resistance

Plot1 plot · 2 params

Engineering

Engineering · L5 · Damped Oscillatory Response

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Engineering · L5 · Damped Oscillatory Response

Note~397 words · 2 min

Charge stored: Q = CV Two conductive plates, an insulator between them. Apply V, collect Q. Drag the capacitance slider below. Charge climbs straight with voltage, and a bigger capacitor sits on a steeper line. Energy stored: E = ½CV² Charg

Engineering

Engineering · L3 · Capacitors & Energy Storage

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Engineering · L3 · Capacitors & Energy Storage

Flashcards9 cards

Why does pushing fluid through a pipe in turbulent flow take more pumping energy than laminar flow, at the same flow rate?1 / 9

Turbulent eddies constantly churn and mix the fluid, converting useful kinetic energy into heat through internal friction. That extra energy loss has to be made up somewhere, so a pump has to supply more pressure to push the same flow rate through a turbulent pipe than a laminar one.

Engineering

Engineering · L3 · Viscosity in Engineering Practice

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Engineering · L3 · Viscosity in Engineering Practice

Note~223 words · 1 min

Two ways to connect them, two different results One battery supplies only so much voltage, and only for so long. Connecting several helps, but HOW you connect them decides which of those two problems you solve. Series adds voltage Two 1.5 V

Engineering

Engineering · L2 · Combining Batteries: Series vs Parallel

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Engineering · L2 · Combining Batteries: Series vs Parallel

Note~392 words · 2 min

One point that behaves like the whole object Every object has a centre of mass: the single point where you could treat all its mass as concentrated. Support it exactly there and it balances, whatever way up it is. The stability rule The bas

Engineering

Engineering · L3 · Center of Mass & Stability

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Engineering · L3 · Center of Mass & Stability

Flowchart5 objects

Engineering

Engineering · L1 · Strong Shapes Quiz · flowchart

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Engineering · L1 · Strong Shapes Quiz · flowchart

Note~601 words · 3 min

Material choice is one of the first decisions in a design and one of the hardest to reverse. It sets weight, cost, strength, thermal behaviour, corrosion life, how you can make it, and what happens to it afterwards. The four classes at a gl

Engineering

Engineering · L4 · Engineering materials: metals, polymers, ceramics, and composites

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Engineering · L4 · Engineering materials: metals, polymers, ceramics, and composites

Flowchart11 objects

Engineering

Engineering · L3 · Transistors as Switches · flowchart

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Engineering · L3 · Transistors as Switches · flowchart

Flashcards10 cards

What is a bending moment?1 / 10

A bending moment is a turning effect that bends a beam. At any point along the beam it equals a force multiplied by its perpendicular distance from that point: M = F × d.

Engineering

Engineering · L3 · Beam Bending

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Engineering · L3 · Beam Bending

Flowchart12 objects

Engineering

Engineering · L3 · Reducing a Mixed Resistor Network

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Engineering · L3 · Reducing a Mixed Resistor Network

Quiz4 questions

What does a motor do?

ATurns electricity into spinning motionBTurns spinning motion into electricityCMakes a room colderDStores electricity for later

Engineering

Engineering · L1 · Fans & Motors Quiz

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Engineering · L1 · Fans & Motors Quiz

Flowchart11 objects

Engineering

Engineering · L3 · Treehouse Project — Task Dependencies & Critical Path

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Engineering · L3 · Treehouse Project — Task Dependencies & Critical Path

Quiz6 questions

Why do engineers draw a plan before they build something?

ATo make the drawing look niceBTo agree on the exact size and shape before it costs time and materialsCBecause building without a plan is against the lawDTo avoid using any measurements

Engineering

Engineering · L2 · Engineering Drawing & Scale Quiz

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Engineering · L2 · Engineering Drawing & Scale Quiz

Note~394 words · 2 min

Designing for how it'll actually be made A part can be perfect on the CAD screen (right shape, right strength, every dimension to spec) and still be a nightmare to manufacture. DFM is designing so a part is easy, fast and cheap to produce,

Engineering

Engineering · L3 · Design for Manufacturing

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Engineering · L3 · Design for Manufacturing

Flashcards9 cards

A material has a yield strength of 300 MPa and a density of 3.0 g/cm³. What is its specific strength?1 / 9

Specific strength = 300 ÷ 3.0 = 100 (MPa per g/cm³).

Engineering

Engineering · L3 · Specific Strength Numeric Problems

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Engineering · L3 · Specific Strength Numeric Problems

Collection5 items

01Engineering · L2 · Electromagnets

02Engineering · L2 · Electromagnets

03Engineering · L2 · Electromagnets

+2 more

Engineering

Engineering · L2 · Electromagnets

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Engineering · L2 · Electromagnets

Flashcards4 cards

State the LQR problem: what system does it control and what cost does it minimise?1 / 4

For the linear time-invariant system ẋ = Ax + Bu, the LQR minimises the infinite-horizon quadratic cost J = ∫₀^∞ (xᵀQx + uᵀRu) dt, where Q ⪰ 0 (positive semi-definite, state penalty) and R ≻ 0 (positive definite, control effort penalty). The matrices Q and R encode the designer's trade-off between state deviation and actuator effort.

Engineering

Engineering · L5 · Optimal Control & LQR

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Engineering · L5 · Optimal Control & LQR

Flashcards8 cards

What is the center of mass of an object?1 / 8

The single point where an object's mass can be treated as if it were all concentrated — the balance point. If you could support the object at exactly that point, it would balance in any orientation.

Engineering

Engineering · L3 · Center of Mass & Stability

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Engineering · L3 · Center of Mass & Stability

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