Gravity and weight

• What is gravity?

  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?

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

  Yes, it depends on where it is
• 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 gravitational field strength defined?

  Measure of force of gravity in a location
• How do you calculate the weight of an object?

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

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

  If mass doubles, weight also doubles
• What is weight measured using?

  Calibrated spring balance which is a Newtonmeter
• What does gravitational field strength depend on?

  Where you are located
• What is the weight of a 100 kg object on Earth?

  100x9.8 = 980 Newtons
• How does the weight of an object change from Earth to the Moon?

  Weight decreases due to lower gravity
• What is the definition of centre of mass?

  The point at which the weight of the object may be considered to act
• What is the relationship between mass and weight

  They are directly proportional