gravity & weight

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

  What's meant by weight
• What type of quantity is gravity?

  Vector quantity
• Why is gravity considered a non-contact force?

  Because the two objects do not need to be touching
• What does the mass of an object tell us?

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

  Kilogram
• Why is mass considered a scalar quantity?

  Because it has no direction
• What is the mass of the elephant mentioned in the video?

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

  No, it does not depend on where the object is
• What is the weight of an object defined as?

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

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

  Yes, it does depend on where it is
• What is the gravitational force at the surface of the Earth?

  1. 8 Newtons per kilogram
• What does the symbol lowercase G represent?

  The gravitational field strength
• How is the gravitational field strength defined?

  It is a measure of the force of gravity in a particular location
• Are you given the weight calculation equation in the exam?

  No, you need to learn it
• How do you calculate the weight of an object?

  Weight in Newtons = mass in kilograms × gravitational field strength in Newtons per kilogram
• What is a calibrated spring balance also called?

  Newton meter
• What happens to the weight of an object if its mass is doubled?

  The weight also doubles
• What does the gravitational field strength depend 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, given its gravitational field strength?

  160 Newtons
• What is the center of mass?

  The point where the weight of an object can be considered to act
• Why is it worth learning the definition of center of mass?

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

  • Weight is the force due to gravity.
  • Mass is the amount of matter in an object.
  • Weight depends on location; mass does not.
  • Gravitational field strength varies by location.
  • Weight can be calculated using the formula: Weight = Mass × Gravitational Field Strength.
• How do you determine the weight of an object using a Newton meter?

  • Use a calibrated spring balance (Newton meter).
  • Hang the object from the meter.
  • Read the weight directly from the scale.