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5 days ago · Physics can, at base, be defined as the science of matter, motion, and energy. Its laws are typically expressed with economy and precision in the language of mathematics. Both experiment, the observation of phenomena under conditions that are controlled as precisely as possible, and theory, the formulation of a unified conceptual framework ...
Physics is the natural science of matter, involving the study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves.
- One-dimensional motion. Introduction to physics: One-dimensional motion Displacement, velocity, and time: One-dimensional motion Acceleration: One-dimensional motion.
- Two-dimensional motion. Two-dimensional projectile motion: Two-dimensional motion Optimal angle for a projectile: Two-dimensional motion.
- Forces and Newton's laws of motion. Newton's laws of motion: Forces and Newton's laws of motion Normal force and contact force: Forces and Newton's laws of motion Balanced and unbalanced forces: Forces and Newton's laws of motion.
- Centripetal force and gravitation. Circular motion and centripetal acceleration: Centripetal force and gravitation Centripetal forces: Centripetal force and gravitation Newton's law of gravitation: Centripetal force and gravitation.
For one, physics keeps changing as we progress and make new discoveries. New theories don't just bring new answers. They also create new questions that might not have even made sense when viewed from within the previous theory of physics. This makes physics exciting and interesting, but it also forces attempts at defining physics into ...
- What is G-ForceA G force is when you feel your same weight against you. for example a roller coaster is 2 Gs,which means you will feel 2x your weight which ever d...
- Does the study of physics alter what we discover in mathematics?For sure. Newton invented calculus to solve the specific problem of calculating planetary motion. Bessel functions were invented to solve the spher...
- This wasn't mentioned in the text, but what is dark matter? Why is there so much of it, but it is un...dark matter is matter that doesn't emit or absorb light. We can't directly measure it.
- What is electric force?An electric force would be a specific type of force (a push or pull, such as gravity or friction) that is caused by the electrical interaction of o...
- so if i finish a physics course on khan academy it wouldn't be enough to score 700 ON SAT physics? i...Just completing a course doesn't directly mean that you'll do good on a test. You still have to do applied practice for the test. The AP Physics 1...
- Can Newton’s 1st and 2nd law of motion both be active at the same time?Sure. Newton's first law states that an object at rest or moving with a constant velocity will stay at rest or stay moving with a constant velocity...
- why is there no gravity in space? and why do we have gravity?There actually is gravity in space: the whole reason the Earth orbits around the sun is because the sun is a 'heavy' object that makes an impressio...
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
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- How do you prove your theory in physics?"Proof" is a word used commonly but has no real meaning outside maths. Maths is the theory behind the idea in that maths is always right or wrong a...
- If the universe is infinite, expanding and accelerating: how is an explosion accelerating, where und...Good question; I like your way of thinking. I agree, it is strange that the universe should be expaning at an accelerting rate. If you want to know...
- what is dynamic system in physics?A system that is continuously changing .
- Why does a balloon filled with hydrogen rises while one filled with air sinks?The density of hydrogen is less than one-tenth that of air.
- Does a magnetic pendulum violate the second law of thermodynamics? Wouldn't a magnetic pendulum move...Air Resistance exists
- How to determine magnitude of displacemetmeasure the straight-line distance from start to finish
- the video talks about the law of gravitation and how its a force, but wasn't that proved wrong by ei...According to Newton Gravitation is a force. And according to Einstein's theory it is not a force it is geometry, but when we study higher level phy...
- How did Einstein show that light is fastest?Actually Einstein didn't show that light is the fastest. Because all measurements of the speed of light in a vacuum showed light going to same spee...
- What does Khan mean by "The whole world is just a mental model that we have"?We perceive the world as something that other beings do not. For example some beings can see ultraviolet light, which we cannot naturally. This mea...
Furthermore, physics has retained the most basic aspects of science, so it is used by all of the sciences, and the study of physics makes other sciences easier to understand. Figure 1.4 The laws of physics help us understand how common appliances work.
Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education <a {{0}}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery.
