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# Motion and Time worksheet for class 7

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## Symmetry worksheet for class 7 Important Topics

• SLOW OR FAST
• SPEED
• MEASUREMENT OF TIME
• MEASURING SPEED
• DISTANCE-TIME GRAPH

## Some important Facts about Motion and Time worksheet for class 7

1. You can make your own sundial and use it to mark the time of the day at your place. First of all find the latitude of your city with the help of an atlas. Cut out a triangular piece of a cardboard such that its one angle is equal to the latitude of your place and the angle opposite to it is a right angle. Fix this piece, called gnomon, vertically along a diameter of a circular board a shown in. One way to fix the gnomon could be to make a groove along a diameter on the circular board. Next, select an open space, which receives sunlight for most of the day. Mark a line on the ground along the North-South direction. Place the sundial in the sun as shown in Fig. 13.16. Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible, say 8:00 AM. Mark the position of the tip of the shadow every hour throughout the day. Draw lines to connect each point marked by you with the centre of the base of the gnomon as shown in Fig. 13.16. Extend the lines on the circular board up to its periphery. You can use this sundial to read the time of the day at your place. Remember that the gnomon should always be placed in the North-South direction as shown in.
2. Collect information about time-measuring devices that were used in the MOTION AND TIME 159 Did you know? The time-keeping services in India are provided by the National Physical Laboratory, New Delhi. The clock they use can measure time intervals with an accuracy of one-millionth of a second. The most accurate clock in the world has been developed by the National Institute of Standards and Technology in the U.S.A. This clock will lose or gain one second after running for 20 million years. ancient times in different parts of the world. Prepare a brief write up on each one of them. The write up may include the name of the device, the place of its origin, the period when it was used, the unit in which the time was measured by it and a drawing or a photograph of the device, if available.

## NCERT class 7  Science Solved Worksheets

• Chapter-1 Nutrition in Plants
• Chapter-2 Nutrition in Animals
• Chapter-3 Fiber to Fabric
• Chapter-4 Heat
• Chapter-5 Acids, Bases and Salts
• Chapter-6 Physical and Chemical Changes
• Chapter-7 Weather, Climate And Adaptation
• Chapter-8 Wind Storms and Cyclones
• Chapter-9 Soil
• Chapter-10 Respiration in Organisms
• Chapter-11 Transportation in Animals and Plants
• Chapter-12 Reproduction in Plants
• Chapter-13 Motion and Time
• Chapter-14 Electric Current and its Effect
• Chapter-15 Light
• Chapter-16 Water A Precious Resource
• Chapter-17 Forests: Our Lifeline
• Chapter-18 Waste Water Story

## MEASUREMENT OF TIME

If you did not have a clock, how would you decide what time of the day it is? Have you ever wondered how our elders could tell the approximate time of the day by just looking at shadows? How do we measure time interval of a month? A year? Our ancestors noticed that many events in nature repeat themselves after definite intervals of time. For example,

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