The Principle of Conservation of Energy The Principle of Conservation of Energy states that: Energy cannot be created or destroyed, it can only change from one form to another This means the total ...
Work Done In Physics, work is done when an object is moved over a distance by an external force applied in the direction of its displacement In the diagram below, the man’s pushing force on the blo...
Archimedes' Principle Archimedes’ principle states that an object submerged in a fluid at rest has an upward buoyancy force (upthrust) equal to the weight of the fluid displaced by the object The o...
Upthrust Upthrust is a force which pushes upwards on an object submerged in a fluid i.e. liquids and gases Also known as buoyancy force, upthrust is due to the difference in hydrostatic pressure at...
Derivation of ∆p = ρg∆h Hydrostatic pressure is the pressure that is exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity The derivation for this equatio...
Pressure Pressure tells us how concentrated a force is, it is defined as the force per unit area Pressure is equal to the force per unit area This equation tells us If a force is spread over a larg...
Density Density is the mass per unit volume of an object Objects made from low-density materials typically have a lower mass For example, a balloon is less dense than a small bar of lead despite oc...
Equilibrium A system is in equilibrium when all the forces are balanced. This means: There is no resultant force There is no resultant torque An object in equilibrium will therefore remain at rest,...
Couples A couple is a pair of forces that acts to produce rotation only Unlike moments of a single force, the moment of a couple doesn’t depend on a pivot, only on the perpendicular distance betwee...
