(a)[1]
State Newton’s first law of motion in your own words.
(b(i))[2]
A box is sliding down a slope, as shown in Fig. 3.1. The slope makes an angle of $20^\circ$ to the horizontal. The box has a mass of $65\text{ kg}$. The total resistive force $R$ on the box stays constant as it slides down the slope. State the names and directions of the other two forces acting on the box.
(b(ii))
The way velocity $v$ changes with time $t$ for the box as it travels down the slope is shown in Fig. 3.2.
(b(iii).1)[2]
Use the data in Fig. 3.2 to demonstrate that the box’s acceleration is $2.6\text{ m s}^{-2}$.
(b(iii).2)[1]
Calculate the resultant force on the box.
(b(iii).3)[3]
Determine the resistive force $R$ on the box.
(main)[3]
Determine the resistive force $R$ on the box.