Match the two columns: Column A Column B 1. Odometer (i) The time taken by a pendulum to complete one oscillation 2. Time period (ii) A device used by Romans to measure time 3. Sand clock (iii) 10 6 nanosecond 4. One second (iv) Representation of the speed of different moving bodies 5. Distance-time graph (v) A unit of time (vi) 10 9 nanosecond (vii) Gives the distance travelled by a moving vehicle

Odometer — (vii) Gives the distance travelled by a moving vehicle. Odometer is a device used to measure the distance travelled by a moving vehicle. It can read the distance either in miles or kilometers. Time Period — (i) The time taken by a pendulum to complete one oscillation. Time Period of a pendulum is defined as the time taken by a pendulum to complete one oscillation. The unit of time is second. Sand clock — (ii) A device used by Romans to measure time. Sand clock is a device used by Romans to measure time. In a sand clock, a definite amount of sand takes a constant time to fall from the upper chamber to the lower chamber. One second — (v) a unit of time, (vi) 10 9 nanosecond. One second is a SI unit of time and the value equals to 10 9 nanosecond. The other units of time are minute, hour, day, week, month and year. Distance-time graph — (iv) Representation of the speed of different moving bodies. Distance-time graph is a representation of the speed of different moving bodies. The slope represents the speed of the body.

Solve the crossword puzzle given alongside with the help of the clues given below: Across 2. An act of change in position ( 6) 3. Measures distance (8) 5. A device to measure time (7) 6. A bob attached to a thread (8) 7. Records speed ( 11) Down 1. A unit of time ( 6) 4. Movement of a pendulum bob (11) 5. Distance travelled in unit time (5)

2. Motion- It is the phenomenon in which an object changes its position over time. 3. Odometer - It is a gauge that tells you the distance travelled by the vehicle. 5. Sundial - It is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. 6. Pendulum - It is the body suspended from a fixed point so that it can swing back and forth under the influence of gravity 1 . 7. Speedometer - It is an instrument which indicates the speed of the vehicle when it is running. Down 1. Second - The second is the SI unit of time. The other units of time are minute, hour, day, week, month, year and century. 4. Oscillation - It is the periodic Motion moving at a distance about the equilibrium position and repeat itself over and over for a period. 5. Speed - It is measured as the ratio between the distance and time and the SI unit of speed is metre per second.

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Start Up Science 7>Chapter 12 - Motion and Time>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

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The time gap between the two events is called .

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Important Questions on Motion and Time

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Start Up Science 7>Chapter 12 - Motion and Time>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

Match the two columns:

	Column A		Column B
1.	Odometer	(i)	The time taken by a pendulum to complete one oscillation
2.	Time period	(ii)	A device used by Romans to measure time
3.	Sand clock	(iii)	$10^{6}$ nanosecond
4.	One second	(iv)	Representation of the speed of different moving bodies
5.	Distance-time graph	(v)	A unit of time
		(vi)	$10^{9}$ nanosecond
		(vii)	Gives the distance travelled by a moving vehicle