Les 4

• Nask / Techniek
• Middelbare school
• mavo, havo, vwo
• Leerjaar 2

Welcome

NTEC2

Check in

Coats/jackets?

Hats/caps?

Phones?

Headphones?

iPad and notebook?

How are you feeling today?

1. :)
2. :|
3. :(

Rough planning

lesson 1: Section 1 + 2

Lesson 2: Section 2 (Experiment)

Lesson 3: Section 2

-> Lesson 4: Section 3 <-

Lesson 5: Grade exercise

Lesson 6: Waterpump

Lesson 7: Waterpump

Section 3

We'll learn about hydraulics, and you will feel for yourself why hydraulics work. 

After that you will do some research on a hydraulic system.

Goals

- After this class you can tell me the definition of a hydraulic system.

- After this class you can name three different uses for hydraulic systems.

Repetition quiz

A little quiz about last week!

Convert
1 cm3 = ... ml

1. 1
2. 10
3. 0,5
4. 2

You did an exercise about density of an object. What does density mean?
(g/cm3 or kg/m3)

1. The amount of volume per mass unit
2. The amount of mass per volume unit
3. How heavy something is
4. How big something is

Complete the formula:
density =

1. mass / Volume
2. Volume / mass
3. mass x Volume
4. Volume x mass

Convert (water)
1 Liter = ... g

1. 1000
2. 10
3. 1
4. 100

What are the three phases?

1. water, ice, gaseous
2. solid, liquid, gaseous
3. liquid, gaseous, ice
4. solid, mist, gaseous

What phase?

Solid

Liquid

Gaseous

Ice

Rain

Water vapour

Steel

Mist

Cola

Air

When melting a substance, you see the temperature changing.
What do you call this?

1. The melting point
2. The melting range
3. The melting area
4. The melting dot

Pure substance

Mixture

In what phase is lead at 20 degrees Celsius?

1. Solid
2. Gaseous
3. Liquid

If you had...

...no mistakes: Good for you!

...question 1 and 4 wrong (conversions): remake exercise 4

...question 2 and 3 wrong (density): remake exercise 5

...question 5, 6 and 7 wrong (phases): remake exercise 6

...question 8 and 9 wrong (change in phase): remake exercise 6.6

Hydraulics

"In hydraulics-based systems, mechanical movement is produced by contained, pumped liquid, typically through hydraulic cylinders moving pistons."

Examples

Experiment 6

Page 17

in duo's

Write down your observations.

What happens at 4 and 5?

There is a chance you will get (a little) water on yourself

Conclusions 

Compressing the smaller syringe was easier/harder?

When the syringes were filled with air; what happened?

Next class

Thursday: Water purification