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Engineering: explore STEM content · openstem

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

Explore STEM Content

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.

Content Groups1

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Flashcards10 cards

What is a feedback control system and why is feedback used?1 / 10

A feedback (closed-loop) control system measures the output, compares it to a desired setpoint, and uses the error to drive an actuator. Feedback compensates for disturbances, plant uncertainty, and model error — making the system robust. Without feedback (open-loop), a single disturbance drives the output away from setpoint indefinitely.

Engineering

Engineering · L4 · Control Systems — Fundamentals & PID

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Engineering · L4 · Control Systems — Fundamentals & PID

Flashcards10 cards

What three parts does a simple robot combine?1 / 10

A robot combines sensors (to sense the world), a simple program (to decide what to do), and motors or actuators (to act) — sense, decide, act.

Engineering

Engineering · L2 · Simple Robots & Motors

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Engineering · L2 · Simple Robots & Motors

Collection5 items

01Engineering · L2 · Friction Basics

02Engineering · L2 · Designing With Friction

03Engineering · L2 · Friction in Design

+2 more

Engineering

Engineering · L2 · Friction in Design

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Engineering · L2 · Friction in Design

Flowchart12 objects

Engineering

Engineering · L2 · What Makes a Robot a Robot · flowchart

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Engineering · L2 · What Makes a Robot a Robot · flowchart

Quiz6 questions

Which statement best describes a design trade-off?

AA mistake the engineer made during testingBGiving up some of one desirable quality to gain more of anotherCA rule set by a government regulatorDThe final price of the finished product

Engineering

Engineering · L3 · Design Trade-offs

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Engineering · L3 · Design Trade-offs

Flowchart12 objects

Engineering

Engineering · L1 · A Notebook Habit, Step by Step

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Engineering · L1 · A Notebook Habit, Step by Step

Plot1 plot · 1 param

Engineering

Power Dissipated vs. Current: P = R·I²

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Power Dissipated vs. Current: P = R·I²

Quiz6 questions

What is the critical path in a project schedule?

AThe single most expensive task in the projectBThe longest chain of dependent tasks, which sets the shortest possible finish timeCThe first task to start in the projectDAny task that has no dependencies

Engineering

Engineering · L3 · Project Scheduling

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Engineering · L3 · Project Scheduling

Quiz6 questions

What is steam?

AWater as a gas, made by boilingBFrozen waterCA type of metalDWater mixed with air only, no heat involved

Engineering

Engineering · L1 · Water Turning to Steam Quiz

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Engineering · L1 · Water Turning to Steam Quiz

Flashcards8 cards

What problem does the Kalman filter solve, and what are its two governing equations?1 / 8

It recursively estimates the state of a linear system from noisy measurements. Process model: xₖ = Axₖ₋₁ + Buₖ₋₁ + wₖ₋₁ (process noise w ~ N(0,Q)). Measurement model: zₖ = Hxₖ + vₖ (measurement noise v ~ N(0,R)). The filter fuses the model's prediction with each new noisy measurement, weighted by their relative uncertainty.

Engineering

Engineering · L5 · Kalman Filtering & State Estimation

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Engineering · L5 · Kalman Filtering & State Estimation

Collection6 items

01RC Charging: V(t) = 1 − e^(−t/τ)

02RC Discharging: V(t) = e^(−t/τ)

03Step Response with Overshoot: 1 − e^(−x)·cos(b·x)

+3 more

Engineering

Engineering · L3 · Engineering Curves

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Engineering · L3 · Engineering Curves

Flowchart13 objects

Engineering

Engineering · L2 · Building a Car — Which Disciplines?

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Engineering · L2 · Building a Car — Which Disciplines?

Note~406 words · 2 min

A switch flipped by electricity A transistor is a three-terminal device that acts as a switch, except the thing doing the switching is a small current instead of a finger. That one idea is why every processor, microcontroller and motor driv

Engineering

Engineering · L3 · Transistors as Switches

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Engineering · L3 · Transistors as Switches

Note~323 words · 2 min

Evaporation takes heat with it Turning liquid into gas isn't free. Breaking the attractions holding liquid particles together takes energy, and that energy comes from whatever is nearby: the surface the liquid sits on, and the air around it

Engineering

Engineering · L2 · Evaporative Cooling

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Engineering · L2 · Evaporative Cooling

Note~547 words · 3 min

Failure without ever overloading anything Until now, failure meant one load big enough to break something. Fatigue is different: load and unload a part repeatedly at a stress that would never break it once, and it breaks anyway. Each cycle

Engineering

Engineering · L3 · Fatigue & Cyclic Loading

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Engineering · L3 · Fatigue & Cyclic Loading

Note~348 words · 2 min

Pressure is what pushes fluid along Water doesn't move through a pipe by itself. Pressure pushes it: how hard the fluid presses on the walls and on anything in its way. Height makes pressure for free A tank up high presses harder at its bot

Engineering

Engineering · L2 · Pressure & Fluids in Pipes

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Engineering · L2 · Pressure & Fluids in Pipes

Flowchart9 objects

Engineering

Engineering · L1 · Keeping a Design Notebook Quiz · flowchart

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Engineering · L1 · Keeping a Design Notebook Quiz · flowchart

Collection6 items

01Engineering · L3 · AC Circuits — Concepts

02Engineering · L3 · AC Circuits — Numeric Problems

03Engineering · L3 · AC Circuits Basics

+3 more

Engineering

Engineering · L3 · AC Circuits

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Engineering · L3 · AC Circuits

Note~178 words · 1 min

Every lever has the same three parts The class is decided by one question: which of the three sits in the MIDDLE? Class 1: fulcrum in the middle Class 2: load in the middle Class 3: effort in the middle

Engineering

Engineering · L2 · Levers: Three Classes

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Engineering · L2 · Levers: Three Classes

Flowchart13 objects

Engineering

Engineering · L2 · Calculating Gear Ratios · flowchart

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Engineering · L2 · Calculating Gear Ratios · flowchart

Flashcards8 cards

A pinned-pinned steel column has E = 200 GPa, I = 8 × 10⁻⁶ m⁴, and L = 3 m. What is its critical buckling load?1 / 8

Engineering

Engineering · L3 · Column Buckling

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Engineering · L3 · Column Buckling

Flowchart14 objects

Engineering

Engineering · L5 · MPC receding-horizon control loop

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Engineering · L5 · MPC receding-horizon control loop

Flowchart13 objects

Engineering

Engineering · L3 · Parallel-Flow vs Counterflow

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Engineering · L3 · Parallel-Flow vs Counterflow

Flashcards8 cards

Between a solid circular rod and a hollow tube of the same mass and material, which resists bending better?1 / 8

The hollow tube. Removing material from the centre (near the neutral axis) and moving it outward increases bending resistance for the same amount of material.

Engineering

Engineering · L3 · Beam Bending

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Engineering · L3 · Beam Bending

Collection7 items

01Engineering · L2 · Bridges and Forces

02Engineering · L2 · Gears, Pulleys, and Circuits

03Engineering · L2 · The Engineering Design Cycle

+4 more

Engineering

Engineering · L2 · Structures & Circuits

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Engineering · L2 · Structures & Circuits

Flashcards9 cards

Why does a hot air balloon rise into the sky?1 / 9

The burner heats the air inside the balloon. Heated air becomes lighter than the cool air outside, so the balloon floats upward — the same way a cork floats up through water.

Engineering

Engineering · L1 · Hot Air Rises

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Engineering · L1 · Hot Air Rises

Quiz6 questions

What is the mechanical advantage of a single fixed pulley?

A1B2CIt has no mechanical advantage at allDIt depends on the size of the wheel

Engineering

Engineering · L2 · Pulleys & Mechanical Advantage Quiz

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Engineering · L2 · Pulleys & Mechanical Advantage Quiz

Note~172 words · 1 min

A motor turns electricity into spinning Give a motor power, from a battery or a wall plug, and its middle part spins round and round. That's the whole job. A fan is a motor plus blades The motor spins, the blades spin with it, and the blade

Engineering

Engineering · L1 · Motors: The Spinning Part Inside

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Engineering · L1 · Motors: The Spinning Part Inside

Note~280 words · 1 min

A design that doesn't fit the budget isn't a solution Performance isn't the only test. Whoever is paying has a fixed amount of money, and a brilliant design at twice the budget simply doesn't get built. Cost estimation predicts what a proje

Engineering

Engineering · L3 · Cost Estimation & Budgeting

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Engineering · L3 · Cost Estimation & Budgeting

Note~207 words · 1 min

Fixed pulley: direction only It's still worth having. Pulling DOWN using your body weight beats lifting UP with your arms. Movable pulley: force halved Block and tackle: stack the segments Reading MA off a diagram A crane operator at MA = 5

Engineering

Engineering · L2 · Pulleys & Mechanical Advantage

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Engineering · L2 · Pulleys & Mechanical Advantage

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