calculation week - composite quantities

• Nask / Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

- calculation week - 

composite quantities

quantities & units

quantity	symbol	unit	abbreviat.	m. instrum.
mass	m	kilogram	kg	scales
volume	V	litre	L	graduated cylinder
length/distance	l / s	metre	m	ruler, measuring tape
temperature	T	degree Celcius	°C	thermometer
time interval	t	second	s	clock, stopwatch
number	-	-	-	counter

Kilometer is a ...

1. Quantity
2. Unit

Mass is a

1. quantity
2. unit

Quantity 

Unit

mm

time

kilogram

mass

volume

litre

length

minute

What does composite mean?

1. combined
2. simple
3. to make
4. to write a song

name three composite quantities

composite quantities

speed	v	meter per sec	m/s or km/h
concentration	c	gram per liter	g/L
density	p (rho)	gram per cubic centimeter	g/cm3

Name the two quantities that compose SPEED.

Name the two quantities that compose concentration.

Name the two quantities that compose density.

what the first step of
calculating with a ratio table?

What mustn't you forget
when calculating with a ratio table?

NO LAPTOP! 

Just your pencil case and calculator!

checklist ratio tables

1) Did you collect the data from the question?

2) Does your ratio table start with QUANTITIES - UNITS?

3) Is distance found at the top? Or is mass found at the top?

4) Did you add your calculations at the bottom AND the top?

     Do not round off intermediate steps, leave them on your calculator!

5) Did you write down the answer to the question with a number and a unit? 

1hvt - to do today 

materials needed

20 mins

10 mins

finished? 

Pencil case! no laptop!

Don't forget your ruler+calculator tomorrow!

Finish the Small Test. Do 4 assignments!

The Bonus Question is still bonus! A 5th assignment is not. 

Check your answers to the Small Test!

Hand in your Small Test. 

Finish your reader SCIENTIFIC METHOD!

Or read from your book. 

IMPORTANT you also have Thursday to finish the reader. 

	25	..........
	0,5	1

km/h

distance (km)

time (h)

the speed = ..........

The unit for speed is

1. s
2. v
3. m/s
4. km/min

Lois runs 75 meters in 15 seconds. What is her average speed in m/s?

1. 0,2 m/s
2. 0,5 m/s
3. 0,4 m/s
4. 5 m/s

White board challenge

every team gets 2 white boards

answer the questions correctly using a ratio table

Question 1

Bert runs a total of 60 kilometers in 3,5 hours. 

Calculate his speed in km/h.

Use a ratio table to answer this question

ANSWER 1

1. distance = 60 km, time = 3,5 hours

2. speed = ........... km/h

3.  converting units: - 

4. 

5. answer:    speed = 17,1 km/h

distance (km)	60	60:3,5 = 17,1
time (h)	3,5	1

Question 2

Simone drives 170 kilometers in 3 hours and 44 minutes.

Calculate her speed in km/h.

Use a ratio table to answer this question

ANSWER 2

1. distance = 170 km, time = 3 hours and 44 minutes

2. speed = ........... km/h

3. converting units: 3 hours = 180 min     180 + 44 = 224 min

4.

5. answer: speed =   45,54    km/h

distance (km)	170	170:224 = 0,7589	0,7589x60 =
time (min)	224	1	60

never round up in your calculator!

Question 3

Rob rides his bike. His speed is 28 km/h.

He drives for 46 km.

How long is he driving?

Use a ratio tabel to answer this question.

ANSWER 3

1. distance = 46 km, speed = 28 km/h

2. time = ........... hours

3. converting units: - 

4.

5. answer: time =  1,64 h

distance (km)	28	1	46
time (h)	1	1:28 = 0,0357	0,0357 x 46 = 1,64

never round up in your calculator!

Question 4

Aliesha is drving in her car. Her speed is 53 km/h.

She drives for 7 minutes.

How far did she drive?

Use a ratio tabel to answer this question.

density questions