Gravity, Weight and GPE

• What is the focus of today's video?

  Weight and gravitational potential energy
• How can gravity be defined?

  As a force of attraction between objects
• What factors affect the size of the gravitational force?

  Mass of objects and distance between them
• Why is the gravitational force of small objects negligible?

  Because they have relatively low masses
• How does distance affect gravitational force for large objects?

  Gravitational force decreases with increased distance
• What is the gravitational field around an object called?

  Gravitational field
• What symbol represents gravitational field strength?

  The letter g
• What is the gravitational field strength on Earth?

  Approximately 9.8 newtons per kilo
• What is the gravitational field strength on the Moon?

  Approximately 1.6 newtons per kilo
• What does an object experience when it enters a gravitational field?

  A force of attraction
• How is weight defined in physics?

  As the force acting on an object in a gravitational field
• How do you calculate an object's weight?

  Mass multiplied by gravitational field strength
• What is the weight of a 60-kilo person on Earth?

  588 newtons
• Why do we often say we weigh 60 kilos instead of having a mass of 60 kilos?

  Because weight and mass are different concepts
• What is the intrinsic property of an object?

  Mass
• What is required to lift an object against gravity?

  Energy or work
• What is the formula for gravitational potential energy?

  ep = mgh
• What units are used for gravitational potential energy?

  Joules
• How do you convert 100 grams to kilos?

  Divide by 1000
• What is the gravitational potential energy of a 100-gram apple thrown 3 meters up?

  1. 94 joules
• What are the key takeaways from the video?

  • Gravity is a force of attraction.
  • Weight equals mass times gravitational field strength (9.8 N/kg on Earth).
  • Gravitational potential energy is ep = mgh.
• What should you do if you enjoyed the video?

  Like and subscribe