can kinetic energy be negative?
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Kinetic energy can't be negative, although the change in kinetic energy Δ K \Delta K ΔK can be negative. Because mass can't be negative and the square of speed gives a non-negative number, kinetic energy can't be negative.
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The potential energy U is equal to the work you must do against that force to move an object from the U=0 reference point to the position r. The force you must exert to move it must be equal but oppositely directed, and that is the source of the negative sign.
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It's possible for a body to have its velocity zero even if the acceleration is non zero. For example consider a swinging pendulum bob. ... This actually happens because acceleration is not velocity - but rate of change of velocity.
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How is it different from potential energy? Kinetic energy is due to an object's motion while potential energy is due to an object's position or state. When you calculate an object's kinetic energy, its velocity is an important factor. Velocity, however, has nothing to do with an object's potential energy.
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Kinetic energy is due to an object's motion while potential energy is due to an object's position or state. When you calculate an object's kinetic energy, its velocity is an important factor. Velocity, however, has nothing to do with an object's potential energy. energy due to its velocity.
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The other definition says that lattice energy is the reverse process, meaning it is the energy released when gaseous ions bind to form an ionic solid. As implied in the definition, this process will always be exothermic, and thus the value for lattice energy will be negative.
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The acceleration due to gravity is ALWAYS negative. Any object affected only by gravity (a projectile or an object in free fall) has an acceleration of -9.81 m/s2, regardless of the direction. The acceleration is negative when going up because the speed is decreasing.
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An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).
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In physics calculations, acceleration — just like displacement and velocity — can be positive or negative. The sign of the acceleration tells you whether you're speeding up or slowing down (depending on which direction you're traveling).
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In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up. When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object also has a negative acceleration.
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A positive (the direction you are facing) and a negative (the direction you are moving) result in a negative move. Hence positive × negative = negative. Finally, back at zero again, face in the negative direction.
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If the system loses energy, for example, by radiating energy into space, the average kinetic energy actually increases. If a temperature is defined by the average kinetic energy, then the system therefore can be said to have a negative heat capacity.
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Kinetic energy is rarely conserved. Only in perfectly elastic collisions. BUT total energy is always conserved in whatever form. In a perfectly inelastic collision (ie when the objects 'stick together' or coalesce, the MAXIMUM amount of KE is lost.
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An object which moves in the negative direction has a negative velocity. ... If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).
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The enthalpy of formation does not need to be negative. The enthalpy of formation tells whether the formation reaction releases heat (negative) or requires heat (positive). ... Reactions where one species fragments into two or more molecules will require heat, but this is offset energetically by the increase in entropy.
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The system can then be characterised as having a negative temperature. A substance with a negative temperature is not colder than absolute zero, but rather it is hotter than infinite temperature. ... In many familiar physical systems, temperature is associated to the kinetic energy of atoms.
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Negative velocity just means velocity in the opposite direction than what would be positive. From the math point of view, you cannot have “negative velocity” in itself, only “negative velocity in a given direction”. The velocity is a 3-dimension vector, there is no such thing as a positive or negative 3D vector.