Les 5,6 Beweging NA 3.1

• Natuurkunde
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• Leerjaar 3

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Onderwerpen van de vorige lessen

Today

1. Revision 

2. Acceleration

What is the formula of velocity

1. v=t/s
2. t=v/s
3. s=v/t
4. v=s/t

quantities and units

distande ( s )	Time ( t)	velocity ( v )
meter ( m )	seconds ( s )	meter per second ( m/s )
kilometer ( km )	hour ( h )	kilometer per hour ( km/uur )

x 3,6

: 3,6

Quantity

Unit

A car slows down for a traffic light. Which s,t diagram belongs to this situation?

1. A
2. B
3. C
4. D

Bron: Cremer et al. 2021, p. 27, 29

A decelerated motion (v,t) graph

A decelerated motion (s,t) graph

An accelerated motion (v,t) graph

An accelerated motion (s,t) graph

A constant motion (v,t) graph

A constant motion (s,t) graph

s,t-diagram

Acceleration

Constant motion

Deceleration

v,t-diagram

Acceleration

Constant velocity

Deceleration

Delta

Δv

Δt

Δs

Geef de juiste combinatie van (x,t)-diagrammen en (v,t)-diagrammen.

Surface method

The surface below a v,t diagram = distance

Average velocity

If the speed increases or decreases, you cannot speak of one single speed.

With the initial speed and the final speed, however, you can calculate the average speed (just like the average of two grades: add them together and divide by 2

What is the average velocity of this motion?

1. 10 m/s
2. 25 m/s
3. 40 m/s
4. 50 m/s

Acceleration

What is acceleration?

Learning goal 

I calculate the acceleration of a constant decelerated or accelerated motion

(v,t)-diagram

What do you see in the graph?

0-4 s acceleration

4-7 s constant motion

Acceleration

If there is a uniform increase in velocity... e.g.

10 m/s, the 20 m/s, then 30 m/s

Then the increase in velocity is 10 m/s every second

THEREFORE the acceleration is 10 meters per second per second

a=10​s​2​​​​m​​

Versnelling berekenen:

a - acceleration in m/s2

t - time in s

v - velocity in m/s

a=​Δt​​Δv​​

Δv=v​end​​−v​begin​​

Constant motion

• velocity v increases at a constant rate
• therefore the acceleration a is constant
• this is called "uniformly accelerated motion"
• the v,t diagram is a straight, rising line

What is the acceleration of this motion?

a = 0,5 m/s²

Constant deceleration

• Snelheid decreases with a constant rate
  
• Velocity decrease per second is called deceleration

What is the acceleration?

a = -2 m/s²

Question 1

A car wants to overtake a truck on the highway. The driver presses the accelerator further, causing the car the accelerate uniformly for 4,0 seconds. As a result, the speed increases from 54 km/h to 90 km/h. 

Calculate the acceleration.

What is correct

1. s = velocity v= acceleration
2. v = velocity a = distance
3. s = distance v = acceleration
4. s = distance v= velocity

Which motion is marked in red next to this?

1. Standing still
2. Constant velocity
3. Acceleration
4. Deceleration

Wat is de formula for acceleration

1. Velocity : time
2. velocity x time
3. distance : time
4. distance x time

Which part of this motion graph shows an acceleration?

1. from 0 to 5 sec
2. from 5 to 15 sec
3. from 15 to 15 sec

Leerdoel 

Ik bereken de versnelling van een eenparige vertraagde of versnelde beweging. 

Klik

Maak de opgaven van week 37 en 38

KLIK - week 39