1. PHYSICS – Length and Time

2. LEARNING OBJECTIVES 1.1 Length and time Core Use and describe the use of rules and measuring cylinders to find a length or a volume Use and describe the use of clocks and devices, both analogue and digital, for measuring an interval of time Obtain an average value for a small distance and for a short interval of time by measuring multiples (including the period of a pendulum). Supplement Understand that a micrometer screw gauge is used to measure very small distances

3. SI units

4. (Le Systeme International d’Unites)

5. SI units (Le Systeme International d’Unites) Mass  kilogram

6. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second

7. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre

8. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre kg 1 tonne = 1000kg = 10 3 kg

9. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre kg 1 tonne = 1000kg = 10 3 kg 1 kilogram (1kg)

10. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre kg 1 tonne = 1000kg = 10 3 kg 1 kilogram (1kg) 1 gram (g) = 1/1000kg = 10 -3 kg

11. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre kg 1 tonne = 1000kg = 10 3 kg 1 kilogram (1kg) 1 gram (g) = 1/1000kg = 10 -3 kg 1 milligram (mg) = 1/1 000g = 1/1 000 000kg = 10 -6 kg

12. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre s

13. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 millisecond (ms) = 1/1000s = 10 -3 s s

14. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 millisecond (ms) = 1/1000s = 10 -3 s s 1 microsecond ( µ s) = 1/1 000 000s = 10 -6 s

15. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 millisecond (ms) = 1/1000s = 10 -3 s s 1 microsecond ( µ s) = 1/1 000 000s = 10 -6 s 1 nanosecond (ns) = 1/1 000 000 000s = 10 -9 s

16. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m

17. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m 1 kilometre (km) = 1 000m = 10 3 m

18. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m 1 kilometre (km) = 1 000m = 10 3 m 1 centimetre (cm) = 1/100m = 10 -2 m

19. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m 1 kilometre (km) = 1 000m = 10 3 m 1 centimetre (cm) = 1/100m = 10 -2 m 1 millimetre (cm) = 1/1000m = 10 -3 m

20. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m 1 kilometre (km) = 1 000m = 10 3 m 1 centimetre (cm) = 1/100m = 10 -2 m 1 millimetre (mm) = 1/1000m = 10 -3 m 1 micrometre ( µ m) = 1/1 000 000m = 10 -6 m

21. SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 metre (m) m 1 kilometre (km) = 1 000m = 10 3 m 1 centimetre (cm) = 1/100m = 10 -2 m 1 millimetre (mm) = 1/1000m = 10 -3 m 1 micrometre ( µ m) = 1/1 000 000m = 10 -6 m 1 nanometre ( n m) = 1/1 000 000 000m = 10 -9 m

22. SI units (Le Systeme International d’Unites) OK, so you think you’ve got all this ‘unit’ stuff? What units would be most suitable for the following?

23. SI units (Le Systeme International d’Unites) OK, so you think you’ve got all this ‘unit’ stuff? What units would be most suitable for the following? The mass of a shoe = The length of a bacterium = Time for an athlete to race = The mass of a boat =

24. SI units (Le Systeme International d’Unites) OK, so you think you’ve got all this ‘unit’ stuff? What units would be most suitable for the following? The mass of a shoe = kilogram The length of a bacterium = micrometre Time for an athlete to race = second The mass of a boat = tonne

25. Measuring Let’s have a think now about what we might use to measure length and time.

26. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH

27. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH Ruler

28. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH Tape measure

29. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH Calipers

30. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH Vernier Calipers

31. Measuring Let’s have a think now about what we might use to measure length and time. LENGTH Vernier Calipers Gap being measured Measurement using the Vernier scale = 1.16cm

32. Measuring Let’s have a think now about what we might use to measure length and time. TIME

33. Measuring Let’s have a think now about what we might use to measure length and time. TIME Stopwatch Analogue Digital

34. Measuring Let’s have a think now about what we might use to measure length and time. TIME Stopwatch Analogue Digital Stopclock Analogue Digital

35. Measuring Let’s have a think now about what we might use to measure length and time. TIME Measuring a pendulum swing A B C

36. Measuring Let’s have a think now about what we might use to measure length and time. TIME Measuring a pendulum swing A B C One complete swing = A  B  A  C  A

37. Measuring Let’s have a think now about what we might use to measure length and time. TIME Measuring a pendulum swing A B C One complete swing = A  B  A  C  A How can we measure the time taken for one complete swing of the pendulum (= Period)?

38. Measuring Let’s have a think now about what we might use to measure length and time. TIME Measuring a pendulum swing A B C One complete swing = A  B  A  C  A How can we measure the time taken for one complete swing of the pendulum (= Period)? Measure the time for 25 swings and divide the result by 25

39. Measuring Let’s have a think now about what we might use to measure length and time. TIME Measuring a pendulum swing A B C One complete swing = A  B  A  C  A How can we measure the time taken for one complete swing of the pendulum (= Period)? Measure the time for 25 swings and divide the result by 25 Eg. Time for 25 swings = 46 seconds. Time for 1 swing = 46/25 = 1.84 seconds

40. LEARNING OBJECTIVES 1.1 Length and time Core Use and describe the use of rules and measuring cylinders to find a length or a volume Use and describe the use of clocks and devices, both analogue and digital, for measuring an interval of time Obtain an average value for a small distance and for a short interval of time by measuring multiples (including the period of a pendulum). Supplement Understand that a micrometer screw gauge is used to measure very small distances

41. PHYSICS – Length and Time