1.4 Energy concepts Flashcards

1
Q

Work, W

A

Work done by a force is the product of the magnitude of the force and the distance moved in the direction of the force.( W.D. = Fxcos θ )
Unit: J

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2
Q

Principle of conservation of energy

A

Energy cannot be created or destroyed, only transferred from one form to another. Energy is a scalar.

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3
Q

Potential energy, Ep

A

This is energy possessed by an object by virtue of its position. (in a gravitational field) Ep = mgh Unit: J

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4
Q

Kinetic energy, Ek

A

This is energy possessed by an object by virtue of its motion. Ek = 1⁄2mv2 Unit: J

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5
Q

Elastic potential
energy

A

This is the energy possessed by an object when it has been deformed due to forces acting on it.
Eelastic = 1⁄2 Fx or 1⁄2 kx2 Unit: J

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6
Q

Energy

A

The energy of a body or system is the amount of work it can do. Unit: J

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7
Q

Power, P

A

This is the work done per second, or energy transferred per second. Unit: W [= J s-1]

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