measuring instrument

A student winds thread tightly 4 times round the length of a metre rule and cuts the ends off level with the left – hand end of the rule as shown in Diagram 1

(a)	To the nearest metre what is the length of the thread? 8 m ……………………………………………………………………………...... [1 mark]
(b)	Is the actual length of thread slightly greater than, slightly less than or exactly the same as your answer in (a)? Tick one box below.                                                                              Slightly greater                          Slightly less                                The same                                                                                 [1 mark]
(c)	Give a reason for your answer to (b) There is some strung around the end of the rule and the rule has some thickness ………………………………………………………………………………. [1 mark]
(d)	State the sensitivity of this measuring instrument. 0.1 cm ………………………………………………………………………………. [1 mark] (e) A student uses the metre rule to measure the length of a piece of wire. Tick the correct box. He should write the measurement as ;                          10 cm                              10.0 cm                                                                                                            [1 mark] The following velocity – time graph shows the motion of a taxi carrying a few passengers (a) If a constant pressure is applied to the acceleration pedal and the road is straight but slippery what happens to the taxi.  (i) between Q and R The taxi is going downhill / down a steep slope ……………………………………………………………………… [1 mark] (ii) between R and S The taxi is going uphill / up a steep slope ……………………………………………………………………… [1 mark] (b) Calculate the distance travelled between;     (i) P and Q Area under the graph PQ  = 100m QR = 125 m (c)   Calculate the acceleration between R and S Acceleration = - 1 m s-2 [2 marks]