5-1 Acceleration 5.1

• Natuurkunde
• Middelbare school
• havo
• Leerjaar 2

 Accelerating (5.1) p 178

Lesson goals:

• Understand the velocity-time graph (v,t)
• Use the formula for acceleration 
• Use the (v,t)-diagram to calculate distance/ displacement

drawing a (v,t)-diagram

v - vertical axis

t - horizontal axis

0-4 s Velocity increases therefore

the object is accelerating

after 4s the motion is constant

uniform motion

Acceleration

An object has a constant acceleration if there is a uniform increase in velocity, for example

t = 1s then v = 3 m/s, 

t = 2s 6 m/s then v= 9 m/s

t = 3s then v = 3 m/s 

therefore the acceleration is 3 m/s2

Calculating velocity:

v - velocity in m/s

x - position im m

t - time in s

v=​Δt​​Δx​​

Δx=x​final​​−x​initial​​

x

v

t

Calculating acceleration:

a - acceleration in m/s2

t - time in s

v - velocity in m/s

a=​Δt​​Δv​​

Δv=v​final​​−v​initial​​

v

a

t

convert velocity

velocity is often given in km/h and must be converted to m/s

m/s               km/h

: 3,6

x 3,6

Convert... 30 km/h = ... m/s

1. 8,3
2. 30
3. 108
4. 300

Convert... 30 m/s= ... km/h

1. 8,3
2. 30
3. 108
4. 300

Convert... 500 km/h = ... m/s

1. 139
2. 500
3. 1800
4. 5000

Example 1

A runner increases his velocity from 1,5 m/s to 2,3 m/s in 4 seconds. Calculate the acceleration.

1. 0,2
2. 0,4
3. 0,6
4. 3,2

A drone accelerates for 3,7 seconds at 3 m/s2. If the drones initial velocity was 4 m/s what will then be it's final velocity?

1. 7,1
2. 8,3
3. 11,1
4. 15,1

Calculating displacement

You can use the (v,t)-diagram 

to calculate distance

Distance = area under the graph

From the digital method

If you understand this stuff, then do:

- Questions 4, 6 and 7 from the digital method.

If you are still strugling then look at the video again and try:

- Questions 1, 2 and 3 from the digital method.

Try the following by yourself:

On the next slide you find question 5 from the textbook with a timer. Give yourself the allowed time to do the question and only when you have completed the question go to the following slide to check if you have it correct. 

Question 8 - Complete this question in your workbook and hand in a photo of your work on the next slide.

Hand in a photo of your Q8 here.

How was the lesson?
Any tips for me how I can do this better?

8

Samenvatting:

Je berekent versnelling met

Je berekent afstand door de area onder de grafiek te berekenen

a=​Δt​​Δv​​

Huiswerk

• Groepjes van 4
  
• Een persoon moet 
  

        voorbereiden voor volgende les

Andere lessen:  L2 - Resultante kracht

                                 L3 - Tweede wet van Newton  F = ma

                                 L11 - Remkracht berekenen