Gravity and weight

• What is gravity described as in the video?

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

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

  It is a 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 the same
• What is the definition of weight?

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

  Newton
• How does weight depend on location?

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

  1. 8 Newtons per kilogram
• What is the symbol for gravitational field strength?

  Lowercase g
• How is weight calculated?

  Weight = mass × gravitational field strength
• What equation do you need to learn for the exam?

  Weight = mass × gravitational field strength
• If an object has a mass of 1 kg, what is its weight on Earth?

  1. 8 Newtons
• What happens to the weight if the mass is doubled?

  The weight also doubles
• What tool can be used to determine an object's weight?

  A calibrated spring balance
• What is another name for a calibrated spring balance?

  Newton meter
• How does gravitational field strength vary?

  It depends on where you are
• What is the weight of a 100 kg object on Earth?

  980 Newtons
• What is the weight of a 100 kg object on the Moon?

  160 Newtons
• 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
• How do you calculate weight using mass and gravitational field strength?

  • Use the formula: Weight = mass × gravitational field strength
  • Example: For 1 kg on Earth, Weight = 1 kg × 9.8 N/kg = 9.8 N
• 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 is constant regardless of location.
  • Gravitational field strength varies by location.