LOW OR FAST - NCERT

Motion and Time13In Class VI, you learnt about differenttypes of motions. You learnt that amotion could be along a straight line,it could be circular or periodic. Can yourecall these three types of motions?Table gives some commonexamples of motions. Identify the typeof motion in each SLOW OR FASTWe know that some vehicles move fasterthan others. Even the same vehicle maymove faster or slower at different a list of ten objects moving alonga straight path. Group the motion ofthese objects as slow and fast. How didyou decide which object is moving slowand which one is moving fast?If vehicles are moving on a road inthe same direction, we can easily tellwhich one of them is moving faster thanthe other. Let us look at the motion ofvehicles moving on a at Fig. It shows the positionof some vehicles moving on a road inthe same direction at some instant oftime. Now look at Fig. It shows theposition of the same vehicles after sometime.

cells. These clocks are called quartz clocks. The time measured by quartz clocks is much more accurate than that by the clocks available earlier. Units of time and speed The basic unit of time is a second. Its symbol is s. Larger units of time are minutes (min) and hours (h). You already know how these units are related to one another.

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