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Intro to Robotics The story so far…
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Engineering ALWAYS WRITE EVERYTHING IN YOUR ENGINEERING NOTEBOOK!
Step 1 – UNDERSTAND – Define the Problem Step 2 – EXPLORE – Do Background Research Step 3 – DEFINE – Determine Solution Specifications Step 4 – IDEATE – Generate Concept Solutions Step 5 – PROTOTYPE – Learn How Your Concepts Work Step 6 – CHOOSE – Determine a Final Concept Step 7 – REFINE – Do Detailed Design Step 8 – PRESENT – Get Feedback & Approval Step 9 – IMPLEMENT – Implement the Detailed Solution Step 10 – TEST – Does the Solution Work? Step 11 – ITERATE ALWAYS WRITE EVERYTHING IN YOUR ENGINEERING NOTEBOOK! DATE EVERY ENTRY
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Robotics Basic Components of a Robot Body/frame Control System
Manipulators Drivetrain Uses and Examples of Robots Industrial Robots Robots in Research Robots in Education
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Electricity Charge (positive or negative) Force (like charges repel)
Electric field (starts on positive, ends on negative) Voltage (positive charges = high potential, more charge = higher potential)
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Circuits Every circuit needs a voltage (energy source), conductors, and a complete loop Current, I – the flow rate of charge (how many charges pass a point each second) measured in amperes (amps) Resistance, R – hindrance to the flow of electric charge, measured in ohms (Ω) Ohm’s law: V=IR Where are we now? How does circuit configuration affect current and voltage?
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IB Physics 1 The story so far
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Energy 1 kind of energy called energy
2 things to do with it: store & transfer 3 ways to transfer: Working (W), Heating (Q), Radiating (R) Many storage modes: kinetic (motion), gravitational (height), elastic (stretch/compress), etc.
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Measurement & Uncertainty
Why? Because you’re not perfect and neither are your tools, but you can try and guess a good range of values. “I think it’s this, but it’s definitely between here and there.” Analog: ± half the smallest division (minimum) Digital: ± one in the last digit (minimum)
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Constant velocity Graphs:
Written: Objects stand still (velocity = 0) or change position at a constant rate. Equations: 𝑣= ∆𝑥 ∆𝑡 𝑥=𝑣𝑡+ 𝑥 0 Graphs: Diagrams: motion maps (dot = position each second, arrows = velocity)
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Inertia & momentum Inertia: an objects’ resistance to changes in velocity Newton’s 1st law (the law of inertia): An object maintains a constant velocity unless acted upon by a net external force. Momentum: the quantity of motion of a moving body, measured as a product of its mass and velocity 𝑝=𝑚𝑣
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Forces & Force diagrams
Weight (W) – the force of gravity acting on a mass; 𝑊= 𝑚𝑔;𝑔=9.81 𝑁 𝑘 𝑔 −1 Normal (N) – reaction force of a surface (to weight force), perpendicular to surface Static friction (Fs) – resistance to potential motion 𝐹 𝑠 = 𝜇 𝑠 𝑁 Kinetic friction (Fk) – resistance to motion 𝐹 𝑘 = 𝜇 𝑘 𝑁 Drag (D) – fluid (gas or liquid) resistance to motion Upthrust (U) –an upward force by a fluid due to pressure
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IB Physics 3 The story so far
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Electricity Charge (positive or negative) Q
Force (like charges repel) 𝐹=𝑘 𝑞 1 𝑞 2 𝑟 2 Electric field (starts on positive, ends on negative) 𝐹=𝑘 𝑄 𝑟 2 Electric potential energy, U=𝑘 𝑞 1 𝑞 2 𝑟 Voltage (positive charges = high potential, more charge = higher potential) V=𝑘 𝑄 𝑟
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Circuits Every circuit needs a voltage (energy source), conductors, and a complete loop Current, I – the flow rate of charge (how many charges pass a point each second) measured in amperes (amps) Resistance, R – hindrance to the flow of electric charge, measured in ohms (Ω) Ohm’s law: V=IR Kirchoff’s rules: Series: current is the same everywhere; resistance adds Parallel: current adds at junctions; resistance adds inversely ( 1 𝑅 𝑒𝑞 = 1 𝑅 𝑅 𝑅 3 +…)
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Magnetism North & south poles No magnetic monopoles
Magnetic field: starts on north, ends on south Metal aligns Induction: changing magnetic fields produce changing electric fields
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Group 4 Project 10 hours Interdisciplinary Design, conduct, report
Same data, physics lens Collect data Thursday at Cesar Chavez Park (bring $2 for city bus & brownslip by Wednesday) Google Slides presentation to Canvas by Thursday night Present in 400 Community Room Friday morning
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