The Language of Motion: Kinematics, Reference Frames, and Physics
Explore the foundations of physics in The Language of Motion. Learn about kinematics, reference frames, and the difference between displacement and distance.
Best quote from The Language of Motion: Kinematics, Reference Frames, and Physics
The 'secret sauce' of two-dimensional kinematics is that horizontal and vertical motions are completely independent of each other. What happens horizontally doesn't care about what's happening vertically, and vice versa.
This audio lesson was created by a BeFreed community member
Don’t overlap or repeat concepts covered in the newton audio lesson but add • Kinematics in one dimension (position, velocity, acceleration) • Kinematics in two dimensions (projectile motion, relative velocity)
Frequently Asked Questions
Kinematics is the mathematical description of motion, derived from a Greek term. It focuses on how objects move through space and time without necessarily addressing the forces involved. To study kinematics effectively, one must establish a coordinate system or reference frame, which acts as a mental map for defining an object's position and movement accurately.
Richard Feynman noted that attempting to define every term perfectly, such as what it means to know something or even the definition of a person, can lead to a total paralysis of thought. In physics, this means we often rely on a gentleman's agreement regarding certain foundational concepts, like coordinate systems, to begin the practical work of describing the physical world.
The distinction between displacement and distance is a fundamental concept in kinematics. Distance refers to the total ground covered, while displacement is a vector that measures the change in position from the starting point. For example, if you walk ten blocks east and ten blocks back west, your total distance is twenty blocks, but your displacement is zero.
Reference frames and coordinate systems are essential because they provide the necessary structure to describe where an object is located. In a simple one-dimensional scenario, such as a car on a straight track, a coordinate system requires an origin point called zero, a single axis, and a designated positive direction to make motion mathematically measurable.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
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"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
