Physics IGCSE Equations

• What is the equation for speed?

  $s=$$\frac{d}{t}$
• What is the equation for weight?

  $W =$$m \times g$
• What is the equation for the volume of a cylinder?

  $V =$$\pi\times r^2\times l$
• What is the unit for speed?

  m/s
• What is the unit for weight?

  Newtons (N)
• What is the unit for volume?

  $m^3$
• What is the unit for density?

  $kg/m^3$
• What is the equation for moments?

  $T =$$F\times d$
• What is the unit for moments?

  Newton meters (Nm)
• What is represented by d in the equation for moments?

  Perpendicular distance of the force from the pivot
• What is the equation for work done?

  $W =$$\Delta E$
• What is the unit for work done?

  Joules (J)
• What does this mean? $\Delta E$


  Energy transferred, change in energy
• What is the equation for pressure?

  $p =$$\frac{F}{A}$
• What is the unit for pressure?

  Pascals (Pa) OR $N/m^2$
• What is the equation for density?

  $\rho =$$\frac{m}{V}$
• What is the equation for resistance?

  $R=$$\frac{V}{I}$
• What is the equation for number of turns or voltage in a transformer?

  $\frac{V_p}{V_s} =$$\frac{N_p}{N_s}$
• What is the element notation?

  $^A_ZX$
• What does X represent?

  The element name
• What does A represent?

  The nucleon number (number of sub-atomic particles in the nucleus)
• What does Z represent?

  The proton number (number of protons in the nucleus)
• What is the unit for resistance (R)

  Ohms $\Omega$
• What is the unit for voltage (V)

  Volts (V)
• What is the unit for current (A)

  Ampères or Amps (A)
• What is the equation for acceleration?

  $a=$$\frac{v-u}{t} =$$\frac{\Delta v}{t}$
• What is the unit for acceleration?

  $m/s^2$
• What is represented by $\Delta v$


  Change in velocity
• What is the equation for force on a spring (Hooke’s Law) ?

  $F=$$k\times x$
• What does k represent in the Hooke’s Law equation?

  The spring constant (N/m)
• What is the unit for force

  Newtons (N)
• What does x represent in the Hooke’s Law equation?

  The extension of the spring
• What is the equation for force acting on an object?


  $F=$$m\times a$
• What is the equation for the momentum of a moving object?


  $p=$$m\times v$
• What is the unit for momentum?

  kgm/s
• What is an impulse?

  The change in momentum
• What is the equation for impulse?

  $F t=$$mv - mu$
• What is the unit for impulse?

  Newton seconds (Ns)
• What is the equation for kinetic energy?

  $ke=$$\frac{1}{2}\times m\times v^2$
• What is the equation for gravitational potential energy?

  $gpe=$$m\times g\times h$