(a)[1]
State Newton’s first law in words.
(b(i))[2]
A log of mass $450\,\text{kg}$ is hauled up a slope by a wire joined to a motor, as shown in Fig. 3.1. The slope is inclined at $12^{\circ}$ to the horizontal. The frictional force on the log is $650\,\text{N}$. The log moves with constant velocity. Using the motion of the log, discuss whether it is in equilibrium.
(b(ii))[3]
Calculate the wire tension.
(b(iii))[2]
State and explain whether the log’s gain in potential energy per unit time is equal to the motor’s output power.