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Grade - 8 (BLE) Physics Energy

Can the kinetic energy of a body be negative?

Can the kinetic energy of a body be negative?

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No, the kinetic energy of a body can never be negative because by definition the kinetic energy is half of the product of mass and the square of the velocity of the body neither of which can be negative.

i.e., \(KE=\frac12 mv^2\), where the mass. m is always positive, and \(v^2\) is the square of velocity is always positive. Hence kinetic energy of a body is always positive.

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Things to Remember From Energy

  • Energy is the capacity of doing work.
  • The SI unit of energy is the joule.
  • There are different forms of energy such as mechanical energy, light energy, sound energy, electrical energy, and so on
  • Mechanical energy is of two types a) Kinetic energy, and b) Potential energy.
  • We get energy in different ways like:
    • heat and light energy from the sun
    • kinetic energy from wind and running water
    • magnetic energy from a magnet, etc

 

Topics from Physics

Physical Quantities 27 Electricity & Magnetism 48 Motion 8 Measurement 4 Electricity 166 Physical Optics 80 Waves 117 Force 51 Heat 137 Laws of Motion 1 Light 100 Pressure 139 Thermodynamics 1

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