Equations Revision list

Speed

Distance divided by time.

Acceleration

The change in velocity (v - u) divided by time (t).

Velocity

Displacement divided by time.

Resultant force

Mass multiplied by acceleration.

Weight

Mass multiplied by gravity.

Pressure

Force divided by area.

Moment

Force multiplied by the perpendicular distance from the pivot.

Density

Mass divided by volume.

Efficiency

Useful output divided by total input.

Work

Force multiplied by distance.

Power

Energy transferred or work done divided by time taken.

Kinetic energy

Measured as ½ multiplied by mass (m) and velocity squared (v²).

GPE (Gravitational Potential Energy)

Calculated as mass (m) multiplied by gravitational acceleration (g) and height (h).

Alpha decay

Produces 4 neutrons and 2 protons (Helium nucleus).

Beta decay

Produces 1 electron, with 0 mass and -1 charge.

Gamma decay

Produces a gamma ray.

1 Pa (Pascal)

Equal to 1 Newton per square meter (N/m²).

1 Watt

Equal to 1 Joule per second (J/S).