gravitational potential energy

• What should you be able to calculate by the end of the video?

  The amount of gravitational potential energy gained by an object raised above ground level
• What is gravitational potential energy?

  It is the energy stored in an object due to its position above the Earth's surface
• What causes gravitational potential energy in an object?

  The force of gravity acting on the object
• What happens to the gravitational potential energy when a ball is lifted off the ground?

  It is converted from chemical energy in the muscles to gravitational potential energy in the ball
• What happens to the gravitational potential energy when the ball falls back to the ground?

  It changes to other forms of energy such as thermal energy and kinetic energy
• How can we calculate the gravitational potential energy of an object?

  Using the equation: gravitational potential energy (in Joules) = mass (in kg) × gravitational field strength × height (in m)
• What is the unit of gravitational potential energy?

  Joules
• What does the gravitational field strength measure?

  It measures the force of gravity
• What is the gravitational field strength value given in the sample question?

  1. 8 Newtons per kilogram
• If a crane lifts a 75 kg mass to a height of 8 m, what is the gravitational potential energy gained?

  5,880 Joules
• What is the mass of the ball in the second example after conversion?

  0.5 kilograms
• How do you convert 500 grams to kilograms?

  By dividing by 1,000
• What is the height of the shelf in the second example?

  1. 5 meters
• What is the gravitational potential energy gained by the ball lifted onto the shelf?

  1. 35 Joules
• What is the equation for calculating gravitational potential energy?

  • Gravitational potential energy (J) = mass (kg) × gravitational field strength (N/kg) × height (m)
• What are the key components needed to calculate gravitational potential energy?

  • Mass of the object (in kg)
  • Gravitational field strength (in N/kg)
  • Height above ground level (in m)
• What should you do if you encounter a question about gravitational potential energy in an exam?

  • Remember to use the equation:
  • Gravitational potential energy = mass × gravitational field strength × height
  • Ensure you convert units if necessary