TTO2 - unit 1 - motion

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 2

Which SI units did you find?
Type each unit separately.

SI units

Make a table of the quantities and units

Add for each a column with their symbols.

Give an example in which kind of job or situation one could use these quantities.

Homework

Tue: Read 1.1 and 1.2 

Fri: study 1.2 again

During the lessons we will work independantly.

I will give extra explanation to who doesn't understand yet.

Name the most interesting job or situation in which you can use these (SI) quantities.

How do you measure speed?

When making a graph of the time it takes to go from home to school,
what labels do I put on the axis?

1. x-axis: speed v y-axis: time t
2. x-axis: distance d y-axis: time t
3. x-axis: time t y-axis: speed v
4. x-axis: time t y-axis: distance d

Distance-time graph

Now draw this graph in your notebook 
with distance in km on the y-axis
and time in min on the x-asis.

Draw the following:
On the first track I ride 3 km in 15 min at constant speed.

Then I need to wait at a traffic light for 5 min. 

Then I need to speed up and ride 3 km in 10 min. 

Acceleration

Make a summary or mindmap
of chapter 1, not page 5 and 9

Use max 1 A4 page. 

Handin next lesson.

Choose of each page the most important concepts.

I ride 3 km in 15 min,
what is my speed in SI units?

Problem Solving Technique
ROPEC

Read

Organise (data)
: given + asked

Plan (formula)

Execute (calculation)

Check (answer + units)

Homework

Tue: Finish summary questions + workbook questions (1.1 +1.2)

Use problem solving technique for calculations.

WB 1.2 Q2: tip 1: use the words time, distance, increasing, decreasing; tip 2: per question say 3 things.
Read 1.3 - skip: extension

Fri: Study 1.3 and 1.4

Tue: Finish summary questions + workbook questions (1.3 + 1.4)

Read 1.5

Today

Review subject matter (homework & test matter) and establish what still needs explanation

Skill: creating a (v,t)-graph
from a (d,t)-graph.
Which step needs explanation?

1. Calculate the speed of each time interval using the formula v = d / t​
2. Draw the graph with ​ time t (s) on the x-axis​ speed v (m/s) on the y-axis​
3. Figure out which are you maximum values so you can adjust the scale
4. Draw the intervals as horizontal lines as the speed is constant

Skill: Reading graphs.
What needs explanation?

1. How are the axes labeled?
2. What is the scale on the axes?
3. What is the slope and shape of the graph?
4. Where does the graph start and end?

Which questions are there still about unit 1.3 and 1.4 (acceleration)

Which questions are there about unit 1.5 and 1.6

What are the main learning objectives of science up to now?

Learning objectives unit 1

- SI units

- Calculating speed using the problem solving procedure.

- Calculating acceleration using the p.s.p.

- Drawing a d,t-graph based on data given / measurements.

- Drawing a v,t-graph based on a d,t-graph.

If we do a formative assessment on 24/9,
when shall we do the summative assessment?

1. Fri 4 October (after project days)
2. Tue 8 October
3. Fri 11 October (just before autumn holiday)
4. Fri 25 October (after autumn holiday)

Take a look at figure 1.4.1
Consider the motion of the object whose speed-time graph is given in the diagram by the blue line.
What can you say about the speed of the object?

Take a look at figure 1.4.1
Consider the motion of the object whose speed-time graph is given in the diagram with the red line.
What can you say about the speed between t=6 s and t=10 s?

Take a look at figure 1.4.2
Consider the motion of the object whose speed-time graph is given in the diagram with the red line.
What can you say about the speed between t=2 s and t=12 s?

Video slide

after this: Brian Cox visits the world's biggest vacuum

Free Fall of a Bowling Ball and a set of feathers.

00:25

What does vacuum mean?

01:27

Which object falls fastest
when air resistance
is significant (= plays a role)?

1. The feathers
2. The bowling ball
3. No difference in speed

02:28

What do we call
the force on any object near the Earth's surface?

03:00

Which object falls fastest
when air resistance
is NOT significant (= plays a role)?

1. The feathers
2. The bowling ball
3. No difference in speed

03:24

Why is there no difference in speed when the feathers and bowling ball fall now?

04:41

According to Newton: a freely falling object has a constant acceleration.

1. TRUE
2. FALSE
3. IDK

The acceleration of a freely falling object near the Earth
is 10 m/s . It took 15 s for the objects to fall.
a) Calculate the speed with which they hit the bottom.
b) Calculate the height from which they fell.
Tip: Use the average speed.

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