Gravity and Weight

• What is the definition of weight?

  Weight is the force acting on an object due to gravity.
• What unit is used to measure weight?

  The unit of weight is the Newton.
• How does gravity act between objects?

  Gravity is a force of attraction that acts between all objects.
• Why is gravity considered a vector quantity?

  Because it has both magnitude and direction.
• What is the unit of mass?

  The unit of mass is the kilogram.
• How does mass differ from weight?

  Mass is a scalar quantity and does not depend on location, while weight depends on gravity.
• What is the gravitational field strength on the surface of the Earth?

  9.8 Newtons per kilogram.
• What does gravitational field strength measure?

  It measures the force of gravity in a particular location.
• How do you calculate the weight of an object?

  Weight = mass × gravitational field strength.
• What is the relationship between mass and weight?

  • Weight is directly proportional to mass.
  • If mass doubles, weight also doubles.
• What is a calibrated spring balance also known as?

  A calibrated spring balance is also called a Newton meter.
• How does gravitational field strength vary?

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

  980 Newtons.
• How does the weight of an object change on the Moon compared to Earth?

  It is less on the Moon due to lower gravitational field strength.
• What is the gravitational field strength on the Moon?

  1.6 Newtons per kilogram.
• What is the definition of center of mass?

  • The point where the weight of an object can be considered to act.
  • It is a single point for the force due to gravity.