Beside above, why is kinetic energy not a vector? So kinetic energy does not depend on direction, hence it must be a scalar, not a vector. Kinetic energy does not use velocity in the equation you stated. That equation uses speed, the magnitude of a velocity vector. Since the magnitude of a vector is a scalar, there is no vector term in the kinetic energy equation. Energy is a scalar. This is because energy is defined as the scalar product of force F and displacement S.
To be clear, F and S are force and displacement vectors. Since the dot product of two vectors give us a scalar , energy is a scalar. So we can say that energy is a scalar quantity. Kinetic energy is a scalar because it is defined to be a scalar. The reason why scientists define certain words to mean certain things is that some definitions are more useful than others. In particular, if a quantity is useful, it is likely to have a name.
The standard dot-product square of a vector is just a scalar. Is potential energy a scalar? As it is often said, an equation is not merely a recipe for algebraic problem solving, but also a guide to thinking about the relationship between quantities.
Kinetic energy is a scalar quantity ; it does not have a direction. Unlike velocity , acceleration , force , and momentum , the kinetic energy of an object is completely described by magnitude alone. Like work and potential energy, the standard metric unit of measurement for kinetic energy is the Joule. Use your understanding of kinetic energy to answer the following questions.
Then click the button to view the answers. Determine the kinetic energy of a kg roller coaster car that is moving with a speed of If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy?
So,mathematically we can prove that Workdone is scalar S [since work is the dot product of force F and the displacement S ]. Other Related Questions on General Physics. If the ball View all Questions ». You will get reply from our expert in sometime. We will notify you when Our expert answers your question. To View your Question Click Here. View courses by askIITians. Click Here Know More. Full Name. What's the question? Add a comment. Active Oldest Votes.
Long answer I'm going to assume you already know the most basic differences between scalars and vectors and how they operate. Improve this answer. JM1 JM1 4 4 silver badges 16 16 bronze badges. Tom-Tom Tom-Tom 1, 10 10 silver badges 23 23 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
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