A car is travelling in a straight line along a horizontal road at a constant speed. A constant driving force D D\,D acts on the car in the forward direction. Which statement about the magnitude of the total resistive force (friction and air resistance) acting on the car is correct?
The magnitude is equal to DDD.
The magnitude is smaller than DDD, but greater than zero.
The magnitude is greater than DDD.
The magnitude is zero.
183 exam-style questions on CIE IGCSE Physics 1.5.1a Forces, resultant force and motion. Each one has a worked solution and a mark scheme showing where the marks go.