Quantities and S.I. units in mechanicsEdexcel A-Level Maths: Mind map

Exam questions on Quantities and S.I. units in mechanics

1. A car of mass 1200 kg travels along a straight horizontal road at a constant $72$ km h$^{-1}$.
   Find the weight of the car, taking $g=9.8$ m s$^{-2}$, and state its unit.2 marks
2. A cyclist of mass 70 kg travels a distance of 5.4 km in a time of 15 minutes along a straight track at a constant speed.
   Find the weight of the cyclist, taking $g=9.8$ m s$^{-2}$, and express the unit of weight in terms of the S.I. base units kg, m and s.2 marks
3. A stone of mass 0.4 kg is dropped from the top of a cliff and hits the sea at a speed of $29.7$ m s$^{-1}$. The stone is modelled as a particle moving vertically under gravity only.
   State three modelling assumptions that are being made about the stone and its motion.3 marks