Question 1

A wooden block of mass, m = 100g, was placed on a rough wooden surface board of length 70 cm, as shown in Fig. 1(a)(i) above.

The wooden block was placed at a distance, x, from the end of the rough wooden surface and the board was raised until it attained a vertical height, h, where the wooden block was just about to slide down the surface of the wooden as shown in Fig. 1(a)(ii) above.

The procedure was repeated for four other values of xi and the corresponding vertical height, hi, was read where i = 1,2,3,4, and 5 respectively.

Fig 1(b) below shows the various values of xi while Fig. 1(c) shows the corresponding values of hi.

Using the diagram as a guide, carry out the following instructions.

(i)         Read and record the values of xiand hiin Fig. 1(b) and Fig. 1(c)  and in each case convert xito real values of Xi and hito real values, Hi, using the scales provided,
where i = 1,2,3,4, and 5 respectively.
(ii)        Evaluate in each case Xi-1 and Hi-1.
(iii)       Tabulate your results.
(iv)       Plot a graph of H-1on the vertical axis and X-1 on the horizontal axis starting both axes from the origin (0,0).
(v)        Determine the slope, s, of the graph.
(vi)       Evaluate k =

(vii)      State any two precautions you would have taken if you were to perform the experiment above.
(b)       (i)         Define friction.

(ii)        State two methods of reducing the effect of friction.