Lss Group 9 : Time and Speed

Part1: Siong Ying and Eunice's race

Part 2: Notes on time and speed

In this video,we have showed how to use the mechanical stop-watch.The accuracy of the stop-watch is o.o1sec.

TIME

Notes on time:

1. Time is the duration of an event which is measured in seconds(s)

2.SI Unit : (s)

3.instruments used:

i) Mechanical stop-watch

ii)electronic stop-watch

iii) Hour-glass

SPEED

Notes on speed:

1.Speed is the measurement of Distance(m) over Time(s)

2.SI Unit : metre per second(m/s)

3.Other measurements includes miles/h , yards/min

4.Speed tells us how fast an object is moving , and it is a rat at which distance is covered overtime.

5.As an object may not be of constant speed throughout its motion , there would be a need to calculate is average speed.

6.Average speed is the measurement of total distance travelled over total

By: Siong Ying,Eunice,Dinie and Cheryl