Gravitational Potential Energy

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Presentation transcript:

Gravitational Potential Energy

Gravitational Potential Energy Gravitational potential energy (PE) is gained when a mass (m) is moved vertically upwards some distance (h) in a gravitational field (g). PE = m x g x h PE Energy Joule (J) m mass kilogramme (kg) g grav field Newton/kilogramme (N/kg) h height metre (m) .

Example (1) A mass of 50 kg is lifted up a vertical distance of 40 m. What is the gravitational potential energy gained ? g = 10 N/kg PE = m x g x h PE = 50 x 10 x 40 PE = 20,000 J .

Example (2) A mass of 800 g is raised a total vertical height of 50 cm. Calculate the potential energy gained. PE = m x g x h PE = 0.8 x 10 x 0.5 PE = 4 J .