Lesson 9 — acceleration

• Science
• Middelbare school
• havo
• Leerjaar 2

4.4 Acceleration

This lesson

•  Recap acceleration
• Discussing the homework
• Rearranging the formula
• Speed-time graphs

Learning goals

• Name the formula for acceleration and apply it in calculations.
  
• Be able to rearrange the formula for acceleration.
  
• Define the unit of acceleration.
  
• Be able to read speed-time graphs
  

Acceleration

acceleration=​time​​finalspeed−startingspeed​​

a=​t​​v​f​​−v​i​​​​

• a: acceleration
  
• vf: final speed
  
• vi: initial speed
  
• t: time
  

a=​t​​v​f​​−v​i​​​​

• a: acceleration
  
• vf: final speed
  
• vi: initial speed
  
• t: time
  

t=

v​f​​−v​i​​=

a=​t​​v​f​​−v​i​​​​

• a: acceleration
  
• vf: final speed
  
• vi: initial speed
  
• t: time
  

t=​a​​v​f​​−v​i​​​​

v​f​​−v​i​​=

a=​t​​v​f​​−v​i​​​​

• a: acceleration
  
• vf: final speed
  
• vi: initial speed
  
• t: time
  

t=​a​​v​f​​−v​i​​​​

v​f​​−v​i​​=a⋅t

The unit of Acceleration

Unit of Acceleration

• speed/time
  
• (m/s)/s
  

m/s

2

Practice exercise 1

A cyclists accelerates at a rate of 1.26 m/s2 for 6.3 seconds. Calculate his change in speed

Practice exercise 2

Elevators in in the Yokohama tower in Japan are among the fastest in the world. They accelerate upwards at a rate of 3.125 m/s2 for 4 seconds.

 

A) Calculate their change in speed during this acceleration.

B) If They start from rest what is their final speed in this acceleration

Speed-time graphs

Speed-time graphs

What type of movement is shown at each part of the graph?

•  A: Steady acceleration
• B: Steady speed
• C Steady acceleration
• D: increasing acceleration
• E Decreasing acceleration

Homework

Worksheet acceleration Exercise 5, 6, 7, 8

Learning goals

• Name the formula for acceleration and apply it in calculations.
  
• Be able to rearrange the formula for acceleration.
  
• Define the unit of acceleration.
  
• Be able to read speed-time graphs