A robot is a programmable machine that senses, thinks, and acts to do a job. Robots can look like arms in factories, little rovers on Mars, toy cars, or kid-built machines made from motors, wheels, batteries, and sensors. Learning about robots matters because they help people explore, build, clean, rescue, and do tasks that may be boring, difficult, or dangerous.
Robots are also a fun way to learn science, math, engineering, and coding.
Key Facts
- A robot senses, thinks, and acts to complete a task.
- Sense -> think -> act is the basic robot loop.
- A sensor collects information, such as light, distance, sound, touch, or temperature.
- A controller is the robot brain that follows a program and makes decisions.
- An actuator is a part that moves, such as a motor, wheel, gripper, or tool arm.
- Speed = distance ÷ time, which helps describe how fast a robot moves.
Vocabulary
- Robot
- A robot is a programmable machine that senses, thinks, and acts to do a job.
- Sensor
- A sensor is a part that detects information from the world around the robot.
- Controller
- A controller is the robot's computer brain that reads sensor information and follows instructions.
- Actuator
- An actuator is a part that makes the robot move or do an action.
- Program
- A program is a set of step-by-step instructions that tells a robot what to do.
Common Mistakes to Avoid
- Thinking every machine is a robot is wrong because a robot must be able to follow a program and usually sense or act in some way.
- Forgetting the sensor is wrong because a robot needs information from its surroundings to make smart choices.
- Calling the battery the robot brain is wrong because the battery gives power, while the controller makes decisions.
- Thinking robots only look like people is wrong because many robots are carts, arms, drones, rovers, or small machines built for special jobs.
Practice Questions
- 1 A small robot travels 120 centimeters in 6 seconds. What is its speed in centimeters per second?
- 2 A robot needs 2 motors for its wheels and 1 motor for its tool arm. If a class builds 5 robots, how many motors are needed in all?
- 3 A floor robot uses a distance sensor and stops when it gets close to a wall. Explain how the robot uses the sense -> think -> act loop.