AS 1 Physics

• base quantities?

  Length, mass, time, electric current, temperature, amount of substance, luminous intensity.
• base units?

  Meter, kilogram, second, ampere, kelvin, mole, candela.
• derived units of density?

  kg/m^3
• equation for density?


  Density = Mass / Volume
• momentum derived units?

  kilogram meter per second (kg·m/s)
• momentum equation?

  P = mv
• acceleration derived unit?


  m/s^2 (meters per second squared)
• acceleration equation?

  total velocity / total time
• force derived units?

  Newton, kgms^-2
• pressure derived unit?

  Pascal (Pa) , kgm^-1s^-2
• pressure equation?

  The pressure equation is P = F/A, where P is pressure, F is force, and A is area.
• work equation?


  Work equation: Work = Force x Distance
• power equation?

  P = IV, where P is power, I is current, and V is voltage.
• electrical charge equation?

  Q = I t
• potential difference equation?

  V = IR
• resistance equation?

  R = V / I
• work derived units?


  Joule (J), kgm^2s^-2
• power derived unit?

  Watt (W), kgm^2s^-3
• frequency derived unit?

  Hertz, s^-1
• Homogeneity of equations?

  That all units can be derived of base units
• what is a scalar?

  A scalar is a quantity that has magnitude but no direction.
• what is a vector?


  A vector is a quantity that has both magnitude and direction.
• Examples of scalars are distance, mass, time, temperature, speed, and energy.
• Examples of vectors are velocity, displacement, force, acceleration, momentum, and work done
• How to represent a vector?

  Arrow where length represents magnitude, direction represents the direction of the vector
• Adding and subtracting parallel vectors , parallel vectors are simply adding or subtracting
• Parallelogram rule on non parallel vectors?

  R = AB + AC
• how to use a vector triangle?

  Triangles are completed in the same way as the parallelograms except they're formed into triangles. You put the vectors tail to head and the resultant from the tail of the first vector to the head of the last
• How to use perpendicular vectors?


  Pythagoras theorem
• distance is total length of path travelled
• displacement is length of straight line path travelled from starting point to end point in a specific direction
• speed is defined as the distance travelled per unit time,
• velocity is displacement per unit time
• speed equation?

  Speed = Distance / Time
• velocity equation?


  v = d/t
• acceleration is the rate of change of velocity, measured in metres per second squared (m/s2)
• acceleration will occur when there is

  change in velocity

  change in direction

  change in velocity and direction
• what does this graph show?

  that as time increases the distance is constant, object is stationary

  
• what does this graph show?

  the distance increases proportionally with time, therefore object is travelling at a steady speed

  
• what does this graph show?

  the slope of the line increases with time, therefore the object is accelerating