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Viscosity – The Physics Hypertextbook

http://physics.info/viscosity

Informally, viscosity is the quantity that describes a fluid's resistance to flow. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them. Represented by the symbol η. Eta) is the ratio of the shearing stress. To the velocity gradient. The more usual form of this relationship, called Newton's equation. Or if you prefer calculus symbols (and who doesn't). The SI unit of viscosity is the pascal second. 1,000 mPa s =. To di...

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Action-Reaction – The Physics Hypertextbook

http://physics.info/newton-third

Actioni contrariam ſemper and æqalem eſſe reactionem: ſive corporum duorum actiones in ſe mutuo ſemper eſſe æqualis and in partes contrarias dirigi. To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. Newton, interpreted by Elert). For every action there is an equal and opposite reaction. A force is an interaction between objects. Forces always occur in pairs (action-reaction, arbitrary assignment).

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Distance & Displacement – The Physics Hypertextbook

http://physics.info/displacement

How far is it? How far is it. 15 × 10. 66th to 86th Street in NYC. 16 × 10. Heel to toe on a man's foot. 30 × 10. You get the idea. The odd thing is that sometimes we state distances as times. How far is it? How far is it. 90 minutes per orbit. 40,000,000 m. 90 minutes by train. Central Park to Battery Park. 90 minutes on foot. Look at the diagram below and then answer the question. There are two ways to answer this question. On the one hand, there's the sum of the smaller motions that I made: two me...

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Forces in Two Dimensions – The Physics Hypertextbook

http://physics.info/force-two-three

Forces in Two Dimensions. Parallel ( ∥. Perpendicular ( ⊥. String and pulley problems. Forces in Two Dimensions. 0169;1998–2016 Glenn Elert. Author, Illustrator, Webmaster. No condition is permanent. Kinematics in Two Dimensions. Forces in Two Dimensions. Momentum in Two Dimensions. Rotation in Two Dimensions. Gravity of Extended Bodies. The Atomic Nature of Matter. The Nature of Waves. The Nature of Sound. Diffraction and Interference (Sound). The Nature of Light. Diffraction and Interference (Light).

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Graphs of Motion – The Physics Hypertextbook

http://physics.info/motion-graphs

Why are there so many equations in this book? Why can't physicists be content with the written word like everyone else? Wouldn't it be easier just to speak directly instead of cloaking ideas behind mathematical cryptograms? All of these relationships can now be written in a single equation. When it comes to depth, nothing beats an equation. Is raised no higher than the first power.). The y intercept equals the initial displacement. When two curves coincide, the two objects have the same displacement.

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The Chaos Hypertextbook

http://hypertextbook.com/chaos

Mathematics in the age of the computer. The first chapter introduces the basics of one-dimensional iterated maps. Say what? The third chapter deals with some of the definitions and applications of the word dimension. A fractal is an object with a fractional dimension. Well, not exactly, but close enough for now. What does this mean? The answer lies in the many definitions of dimension. 0169;1998–2016 Glenn Elert. Author, Illustrator, Webmaster. No condition is permanent. The third chapter deals with some...

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Forces – The Physics Hypertextbook

http://physics.info/newton-first

The first chapter of this book dealt with the topic of kinematics. 8212; the mathematical description of motion. With the exception of falling bodies and projectiles (which involve some mysterious thing called gravity) the factors affecting this motion were never discussed. It is now time to expand our studies to include the quantities that affect motion — mass and force. The mathematical description of motion that includes these quantities is called dynamics. How would you measure such a thing? The forc...

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Shock Waves – The Physics Hypertextbook

http://physics.info/shock

When the speed of a source equals the speed of sound ( v. The wave fronts cannot escape the source. The resulting pile of waves forms a large amplitude sound barrier that makes sustained flight at this speed difficult and risky. Thought that these effects meant that supersonic flight was impossible; that somehow airplanes would never travel faster than the speed of sound. They were wrong. When the speed of a source exceeds the speed of sound ( v. Unlike ordinary sound waves, the speed of a shock wave var...