physic

Subdecks (8)

Cards (151)

  • density = mass over volume, unit = kg/m^3
  • force = pressure x surface area, unit = N (Newton)
  • distance = speed times time, unit = metres per second
  • velocity = distance divided by time, unit = m/s
  • acceleration = change in velocity divided by time, unit = m/s^2
  • pressure = force(weight) divided by area, unit = Pa
  • weight = mass over gravitational field, unit = N/kg
  • smaller the area of contact, the larger the pressure
  • larger the area contact, the smaller the pressure exerted
  • larger the force applied, the larger pressure exerted
  • smaller the force applied, the smaller the pressure exerted
  • density of material > density of water = sink
  • density of material < density of water = float
  • mass= measured with beam / electronic balance
  • weight = measured with spring balance
  • gravitational field strength- earth = 10N/kg, moon = 1.6N/kg
  • gravitational field= region in which a mass experience force due to gravitational attraction
  • force is a push and pull (not an energy)
  • contact force = exist when objects are in contact
  • non-contact force = forces do not need objects to be on contact
  • mass
    • not a force
    • measure the amount of matter (atoms, molecules, compounds) in a body
    • does not change regardless of location or shape
    • SI UNITS : kg
    • scalar quantity
  • weight
    • gravitational force acting on an object that has mass
    • SI UNITS : N --> newton
    • direction --> downwards, towards centre of the earth
    • vector quantity
  • earth´s gravitational field strength = 10N/kg
    moon´s gravitational field strength = 1.6N/kg (5x slower)
  • formula for mass and weight
    g=weight/ mass
    • density formula
    density = mass/volume
    • SI UNIT
    kg/m^3