Gravity and weight

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

  What's meant by weight
• What is gravity described as in the video?

  A force of attraction between all objects
• Why is gravity considered a non-contact force?

  Because objects do not need to be touching
• What type of quantity is gravity?

  Vector quantity
• What does the mass of an object indicate?

  How much matter the object has
• What is the unit of mass?

  Kilogram
• Why is mass considered a scalar quantity?

  It has no direction
• What is the mass of the elephant mentioned?

  5,000 kg
• Does the mass of an object change based on its location?

  No, it remains constant
• What is the definition of weight?

  The force acting on an object due to gravity
• What is the unit of weight?

  Newton
• How does the weight of an object depend on its location?

  It varies based on gravitational field strength
• What is the gravitational force on the surface of the Earth?

  9.8 Newtons per kilogram
• What is the symbol for gravitational field strength?

  Lowercase g
• How is weight calculated?

  Weight = mass × gravitational field strength
• What is the weight of a 1 kg object on Earth?

  9.8 Newtons
• What does it mean that weight is directly proportional to mass?

  If mass doubles, weight also doubles
• What is a calibrated spring balance also known as?

  Newton meter
• How does gravitational field strength vary?

  It depends on location
• What is the weight of a 100 kg object on Earth?

  980 Newtons
• What is the gravitational field strength on the Moon?

  1.6 Newtons per kilogram
• What happens to the weight of an object on the Moon?

  It decreases due to lower gravitational strength
• What is the center of mass?

  The point where weight acts on an object
• Why is it important to learn the definition of center of mass?

  It could come up in your exam
• What are the key concepts related to weight and mass?

  • Weight is the force due to gravity.
  • Mass is the amount of matter in an object.
  • Weight depends on gravitational field strength.
  • Mass remains constant regardless of location.
  • Gravitational field strength varies by location.
• How do you calculate the weight of an object?

  • Use the formula: Weight = mass × gravitational field strength
  • Ensure you know the mass in kilograms.
  • Use the correct gravitational field strength for the location.