1. Measurements
in Science
Mr Kremer’s
Grade 9 Class
Image: http://www.bjj.org/another-zombie-attack

2. SI Units

3. SI Units

4. Dimensional Analysis

5. Dimensional Analysis

6. Dimensional Analysis
How many
seconds in
2.4 hours?

7. Dimensional Analysis
How many
seconds in
2.4 hours?
2.4 hrs 60 min 60 s
1 hr 1 min

8. Dimensional Analysis
How many
seconds in
2.4 hours?
2.4 hrs 60 min 60 s
1 hr 1 min 8640 s

9. Dimensional Analysis
How many
days in
5.9x106 s?

10. Dimensional Analysis
How many
days in
5.9x106 s?
How many
gigaseconds in
3.2x1012
nanoseconds?

11. Dimensional Analysis
How many
days in
5.9x106 s?
How many
gigaseconds in
3.2x1012
nanoseconds?
How many dg
in 1.2 kg?

12. Dimensional Analysis
How many
days in
5.9x106 s?
How many
gigaseconds in
3.2x1012
nanoseconds?
How many dg
in 1.2 kg? How many m2
in 100 cm2?

13. Dimensional Analysis
What if there are
multiple units in
the question?
5.6 m 1 km 60 s 60
min
s 1000 1 min 1 hr
m 20.16 km/
hr

14. Dimensional Analysis
What if there are Example:
multiple units in How many
the question? km/hr is 5.6
m/s?
5.6 m 1 km 60 s 60
min
s 1000 1 min 1 hr
m 20.16 km/
hr

15. Dimensional Analysis
What if there are Example:
multiple units in How many
the question? km/hr is 5.6
m/s?
1st convert one
unit. In this
case,
km ➜ m
5.6 m 1 km 60 s 60
min
s 1000 1 min 1 hr
m 20.16 km/
hr

16. Dimensional Analysis
What if there are Example:
multiple units in How many
the question? km/hr is 5.6
m/s?
1st convert one Next convert the
unit. In this other unit. In
case, this case, s ➜ hr
km ➜ m
5.6 m 1 km 60 s 60
min
s 1000 1 min 1 hr
m 20.16 km/
hr

17. Dimensional Analysis
What if there are Example:
multiple units in How many
the question? km/hr is 5.6
m/s?
1st convert one Next convert the
unit. In this other unit. In
case, this case, s ➜ hr
km ➜ m (5.6 x 1 x 60 x 60)
5.6 m 1 km 60 s 60 (1 x 1000 x 1 x 1)
min
s 1000 1 min 1 hr
m 20.16 km/
hr

18. Dimensional Analysis
60 km/hr in m/
s?
PRACTICE
THESE!

19. Dimensional Analysis
60 km/hr in m/
s?
90 km3 in m3?
PRACTICE
THESE!

20. Dimensional Analysis
60 km/hr in m/
s?
90 km3 in m3?
PRACTICE
THESE!
52 Mm/hr2 in
m/s2?

21. Dimensional Analysis
60 km/hr in m/
s?
90 km3 in m3?
PRACTICE
THESE!
52 Mm/hr2 in 19 mg μm/
m/s2? hr2 in kg m/
s2?