Science semester 1 physics

Cards (23)

  • minutes to seconds

    x 60
  • Scalar quantities
    Refers to a quantity/number with a magnitude only e.g. 10kg or 52s
  • Vector quantities
    Refers to a quantity/number with magnitude AND direction e.g. 100m to the left
  • Magnitude
    How big something is
  • Direction
    Towards a certain position, includes compass points (N,S,E,W), left, right, up, down, and measured angles
  • Distance (d)
    A scalar quantity that describes the total length of an object's path e.g. 5km run around the school
  • Displacement (s)
    A vector quantity that includes direction and describes the change in position (x) of an object eg the displacement is the distance 50-0=50m in the direction PQ
  • Formula for displacement

    s = x2 - x1
  • x2
    Final position
  • x1
    Initial position
  • Speed (v)

    A scalar quantity that measures the change in distance per unit time. The unit is m/s
  • Instantaneous speed

    The speed at a single point in time but is hard to calculate
  • Average speed formula

    Vav = distance / time taken
  • Km/h to m/s = divide by 3.6
  • M/s to km/h = multiply by 3.6
  • t = d/Vav
  • d = Vav * t
  • Formula for velocity: V = x2-x1/time
  • Km/h to m/s = divide by 3.6
  • Acceleration
    A vector quantity that measures how the velocity changes per unit time, changing if direction or magnitude of velocity changes. Unit: m/s^2
  • Average Acceleration Formula
    Aav = (v - u) / t
  • Gravity – a force between any two objects that have mass. Bigger objects have more gravitational forces.
  • Force – a push, pull, or twist that causes an object to increase or decrease its speed (acceleration), change direction, or change shape. Measured in newtons (N)