PHYSICS – Length and Time

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

SI units

(Le Systeme International d’Unites)

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

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

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

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

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

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 = kg

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 = kg 1 milligram (mg) = 1/1 000g = 1/ kg = kg

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

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

SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 millisecond (ms) = 1/1000s = s s 1 microsecond ( µ s) = 1/ s = s

SI units (Le Systeme International d’Unites) Mass  kilogram Time  second Length  metre 1 millisecond (ms) = 1/1000s = s s 1 microsecond ( µ s) = 1/ s = s 1 nanosecond (ns) = 1/ s = s

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

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

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 = m

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 = m 1 millimetre (cm) = 1/1000m = m

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 = m 1 millimetre (mm) = 1/1000m = m 1 micrometre ( µ m) = 1/ m = m

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 = m 1 millimetre (mm) = 1/1000m = m 1 micrometre ( µ m) = 1/ m = m 1 nanometre ( n m) = 1/ m = m

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?

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 =

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

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

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

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

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

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

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

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

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

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

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

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

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

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)?

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

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

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

PHYSICS – Length and Time