University:
Morehouse College
Course:
HPHY 154 | Mechanics
Academic year:

2022
Views:

145

Pages:

7
Author:

McGowanfgu

POTENTIAL ENERGY P.E. "Stored energy" FORMULA Ep = mgh Ep = potential energy (J) Joules m = mass (kg) g = gravity (9.8 m/s²) h = height (m) A 10kg book is on a shelf 2.5 meters above the floor. What is its potential energy? m = 10kg g = 9.8 m/s² h = 2.5 m Ep = mgh Ep = 10kg * 2.5m Ep = 25 J KINETIC ENERGY = K.E. "energy of motion" FORMULA Ek = 1/2 mv² Ek = kinetic energy or K.E. (J) m = mass (kg) v = velocity (m/s) A 50kg boy and his 100kg father went jogging. Both ran at a rate of 5 m/s. Who had more kinetic energy? Ek = 1/2 mv^2 Ek = 1/2 * 50kg * (5m/s)^2 Ek = 1/2 * 50kg * 25 Ek = 25 * 25 = 625 J (BOY) Ek = 1/2 mv^2 Ek = 1/2 * 100kg * (5m/s)^2 Ek = 1/2 * 100 * 25 Ek = 50 * 25 = 1250 J (FATHER)

Phys Potential and Kinetic Energy

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