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Across 1. the metallic ball of a pendulum 4. a clock used in ancient times that used the flow of water to measure time. 9. 10 centuries 10. total distance covered divided by total time taken 12. SI unit of speed 15. motion where speed of object keeps changing 17. a device that tells the time of day by the apparent position of the Sun in the sky. 19. speed X time 20. motion of a fly 21. motion of earth on its axis 22. SI unit of time 23. 10 decades

Down 2. a device that measures the distance moved by the vehicle 3. discovered that the time period of a pendulum is a constant 5. the time taken for one oscillation 6. a clock with consistently spaced markings, which when burned, indicates the passage of time 7. SI unit of distance 8. a device that measures the speed of the vehicle 11. unscramble this word neudlump 13. s device that comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material (historically sand) from the upper bulb to the lower one. 14. motion of pedal of a bicycle 16. motion exhibited by an object moving in a st line with a constant speed 18. motion of a pendulum 19. 10 years