Robots on the Go
You made it! You have traveled through ten lessons about one of the most exciting parts of robotics: how robots move. You learned about wheels, legs, tracks, robot arms, grippers, motors, balancing, force, obstacle avoidance, and engineering design. That is a lot! Let us take a tour of everything you discovered — and make sure it is all locked in your memory.
Key Ideas From This Module
Here is a quick tour of the big ideas from each lesson. Movement is everything. Without movement, a robot cannot do most jobs. The way a robot moves is one of the most important design decisions an engineer makes. Wheels are fast and efficient on smooth surfaces. Tracks handle rough terrain. Legs can go almost anywhere but are the hardest to control. Engineers choose the travel type that fits the job. Robot arms have joints powered by motors. More joints means more freedom of movement. Arms let robots reach out and work in the world. Grippers are a robot's hands. Different gripper shapes work for different tasks. Pressure sensors help robots grip the right amount — not too tight, not too loose. Motors are the muscles. DC motors spin continuously. Servo motors hold exact positions. Stepper motors move in precise steps. Every moving part in a robot has a motor. Balance requires keeping the center of gravity above the base. Gyroscopes and accelerometers help robots sense which way they are tilting so they can adjust in real time. Force control means using just the right amount of push or pull — gentle for fragile things, strong for heavy things. Cobots work safely alongside people using force-sensing compliance. Obstacle avoidance uses sensors like ultrasonic, infrared, lidar, and cameras to detect objects. Path planning helps the robot calculate the safest route to its destination.
Flashcards — click each card to reveal the answer
Module Review Questions
A robot needs to work outdoors on a rocky, muddy hillside. What travel method is most likely best for this job?
A robot arm has seven joints. Why does having more joints give the arm an advantage?
Which motor is best for a robot joint that needs to move to exactly 30 degrees and hold that position?
A delivery robot is about to bump into a sleeping cat on the floor. What is the safest thing for the robot to do?
A robot is picking up both heavy metal pipes and fragile glass ornaments. What does it need most to handle both jobs?
Which of these is the best description of what a cobot is?
You now understand the mechanics behind every robot you will ever see moving in the world. Wheels, legs, arms, grippers, motors, balance, force, sensors — it all connects. Every time a robot picks up a cup, walks down a hallway, or explores a new place, it is using everything you just learned. You think like a robotics engineer now!
Teach It Back
- The best way to truly know something is to teach it to someone else.
- Find a friend, sibling, or family member who has not done this module.
- Tell them four things you learned — in your own words, not reading from notes. Try to include something about movement types, motors, balancing, and obstacle avoidance.
- Then give them this challenge: name a robot from TV, a movie, or real life, and together decide what kind of legs or wheels it has, what its arms and grippers look like, and one problem it might have with balancing or bumping into things.
- If you can explain it clearly and talk about a real or imagined robot together, you have truly mastered this module. On to the next adventure!