Gravitational Potential Energy Notes PDF

8-01-2024 Gravitational Potential Energy Starter: Open the slides on google classroom and read them through while the register is being done Keywords - Kinetic Energy...

8-01-2024 Gravitational Potential Energy Starter: Open the slides on google classroom and read them through while the register is being done Keywords - Kinetic Energy - Elastic Potential - Gravitational Potential - Joules - Transfer  Gravitational Potential Energy All purple text in these slides must be copied into your book GPE is energy stored in an object because of its position in a gravitational field. When an object is lifted up, its GPE increases. When an object is lowered down, its GPE decreases.  Gravitational Potential Energy GPE is energy stored in an object because of its position in a gravitational field. The amount of GPE an object has depends on: The distance it moves upwards How much mass it has The planet it’s on  Gravitational Potential Energy GPE is energy stored in an object because of its position in a gravitational field. GPE = mass x Gravitational x height Field strength GPE = m x g x h GPE = gravitational potential energy (J) m = mass (kg) g = gravitational field strength (N/kg) h = height (m) What is ‘g’? It is a measure of how much force one mass exerts on another – the strength of its gravity. Earth has a gravitational field strength of 9.81 N/kg. You will always be given the value of g for any calculation, but it is easier to learn it! Calculation Layout Steps Step 1: Write out the equation you are going to need to calculate your answer. Rearrange if needed. Step 2: Write out all the information you have been given in the question, with units. Step 3: Substitute in the values to your equation Step 4: Do the maths! Step 5: State your answer, with correct units  Example 1 - copy the purple into your book An object of mass 10kg is lifted up 20m, on Earth, where g = 9.8 N/kg. What is the gravitational potential energy of the object? Step 1: Write out the equation you are going to need to calculate your answer. Rearrange if needed. GPE = mass x gravitational field strength x height Step 2: Write out all the information you have been given in the question, with units. GPE = ??? m = 10kg g = 9.8 N/kg h = 20m Step 3: Substitute in the values to your equation GPE = 10 x 9.8 x 20 Step 4: Do the maths! GPE = 1960 Step 5: State your answer, with correct units GPE = 1960 J  Example 2 – do this in your book An object gains gravitational potential energy of 294J on Earth, where g = 9.8N/kg. If the mass of the object is 3kg, what is the height that the object has been raised? Step 1: Write out the equation you are going to need to calculate your answer. Rearrange if needed. GPE = mass x gravitational field strength x height height = GPE / (mass x gravitational field strength) Step 2: Write out all the information you have been given in the question, with units. GPE = 294J m = 3kg g = 9.8 N/kg h = ??? Step 3: Substitute in the values to your equation Step 4: Do the maths! Step 5: State your answer, with correct units  Knowledge Check When a ball falls from a tree, its gravitational potential Start Timer energy _________. When a car travels along a level road, 7 Minutes the gravitational potential energy of the car __________. When a child on a swing moved from one extreme to the opposite extreme, their gravitational potential energy 6 _________ then __________. 4 What is the equation to calculate GPE? What it the GPE of an object with a mass of 300 kg that has been raised by 5 m? 2 An astronaut jumps up 0.5m on the moon. Explain why the amount on GPE he gains is less than if he jumped the same 0 distance on earth Your turn Open the worksheet on google classroom. Practice using the equation - answer in your book. You should show your full working out for every question! If you are struggling, use the calculation steps on slide 6 and the triangles on slide 7 to help you and you can ask another student for help (quietly) if need be