Examinations
To sit the exams successfully, students must learn the following formulae for relationships between physical quantities. We will not provide these formulae to students in the exam.
| Relationship between: | |
|---|---|
| speed, distance and time: | Speed = distance time taken |
| force, mass and acceleration: | Force = mass x acceleration Acceleration = change in velocity time taken |
| density, mass and volume: | Density = mass volume |
| force, distance and work: | Work done = force x distance moved in direction of force |
| mass, weight and gravitational field strength: | Weight = mass x gravitational field strength |
| an applied force, the area over which it acts and the resulting pressure: | Pressure = force area |
| the moment of a force and its distance from the pivot: | Moment = force x perpendicular distance from pivot |
| charge, current, voltage, resistance and electrical power: | Charge = current x time Voltage = current x resistance Electrical power = voltage x current |
| speed, frequency, and wavelength: | Wave speed = frequency x wavelength |
| the voltage across the coils in a transformer and the number of turns in them: | voltage across secondary = number of turns in secondary voltage across primary number of turns in primary |
| speed, distance and time: | Energy transferred = work done Kinetic energy = ½ x mass x speed ² Change in potential energy = mass x gravitational field strength x change in height |