Energy (Leaving Cert Physics): Flashcards

Ability to do work

Scalar (has magnitude, no direction)

Joule (J)

$E_k = \frac{1}{2}mv^2$

Quadruples the kinetic energy

$E_p = mgh$

Energy due to position in force field

Energy cannot be created or destroyed, only transformed or transferred

Work done = Change in kinetic energy

GPE converts to KE

Remains constant (KE + PE)

Converts to heat and sound

Sources that don't get used up and can be replenished naturally

Finite sources that will be exhausted

Wind, solar, hydroelectric, wave, tidal, geothermal