Speed is a scalar quantity. State another scalar quantity.
Velocity is a vector quantity. State another vector quantity.
A barge is floating on still water. The mass of the barge is 400 000 kg400\,000\text{ kg}400000 kg. A resultant force of 60 kN60\text{ kN}60 kN acts on the barge. Calculate the acceleration of the barge.
The barge is now on a fast-flowing river where the river banks run East-West. A force of 90 kN90\text{ kN}90 kN from the river current acts on the barge directly to the West. The engine of the barge exerts a force such that the resultant force on the barge is 120 kN120\text{ kN}120 kN directed straight across the river to the North.
State the magnitude of the component of the engine's force that acts East and the component that acts North.
Calculate the magnitude of the force exerted by the engine.
Calculate the angle between the direction of the river current (West) and the force exerted by the engine.
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.