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Weight and Gravitational Potential Energy in KS4 Learning

Explore the concepts of weight and gravitational potential energy for KS4 students. Learn how to calculate GPE changes with practical examples. Understand the relationship between mass, weight, and gravity.

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Weight and Gravitational Potential Energy in KS4 Learning

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  1. Work Done Ashfield Direct Learning Ks4 Energy Lindzi Meek

  2. Weight • Weight is due to the force of gravity. • Every 1kg of matter has a weight of 10N near the surface of the earth due to gravity. • The weight of objects near to the surface of the earth are numerically 10 times bigger than its mass in kg.

  3. Gravitational Potential Energy • An object has gravitational potential energy if it has energy stored because it is at a height. • If an object can fall it has got Gravitational Potential Energy – GPE.

  4. Example 1 • A skier who weighs 800N takes the ski lift which takes him from a height of 1000m to a height of 3000m above the ground. By how much does his gravitational potential energy change? E = mg × h = 800N × (3000m ­ 1000m) = 800N × 2000m =1600000J • As the skier has gone UP it is an INCREASE in GPE

  5. Example 2 • A crane lowers a load of 25000N from a height of 15m down to the ground. By how much does the gravitational potential energy of the load change? E = mg × h = 25000N × (15m-0m) = 25000N × 15m = 375000J • As the load has gone down • It is a DECREASE in GPE.

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