Gravitational Potential and Kinetic Energy

Gravitational Potential Energy Energy an object has due to it’s position above a reference level

Gravitational Potential Energy Where: Eg – Gravitational Potential Energy (J) h – Height above reference level (m) g – Acceleration due to gravity g=9.81m/s2 m – Mass of the object (kg)

Kinetic Energy Energy due to the motion of an object

Kinetic Energy Where: Ek – Kinetic Energy (J) v – Speed (m/s) m – Mass of the object (kg)

Wrecking Ball Example Kinetic Energy Potential Energy Potential Energy Reference Level Kinetic Energy Potential Energy Potential Energy

The wrecking ball is constantly converting energy from potential to kinetic and back In an ideal situation, the height will stay the same (zero energy will be lost)

Example 1 Calculate the potential energy of Mr. Simnett (mass is 100kg) when he jumps 1.0m above the ground.

Example 2 Calculate the kinetic energy of Mr. Simnett when he is running at 1.5 m/s (m=100kg).

Work Pg 142 # 1,3,4 Pg 143 # 7-10