Lesson 3 — doing calculations

• Speed
• Middelbare school
• havo, vwo
• Leerjaar 2

TTO 2 – Science

Period 1 — Speed

This lesson

•  Discussing the homework
• Rearranging the formula for speed
• Doing calculations
• Start paragraph 4.2

Goals

• Be able to rearrange the formula for speed
• Name the steps to use when doing a calculation
• Explain what is meant by average speed, and be able to exercise it

• Apply the formula for speed in calculations, including having to rearrange it
  

The homework

Rearranging the formula for speed

The formula for speed

Speed=​time​​distance​​

v=​t​​d​​

• speed (v) – m/s
  
• distance (d) – m
•  time (t) – s

Doing calculations

While doing calculations, go through the following steps:

•  Given
• Asked
• Formula
• Calculate
• Check

Exercise

The space-x rocket called Falcon 9 travels at a speed of 5950 km/h. calculate how many kilometers it would travel in 2,5 days.

Average speed

avaragespeed=​totaltime​​totaldistance​​

Exercise

Two friends go on a road trip for three days. 

On the first day they travel 765 km in 8,5 hours.

On the second day they travel 660 km in 6 hours.

On the third day they travel 630 km in 9 hours.

Calculate their average speed.

avaragespeed=​totaltime​​totaldistance​​

Worksheet calculations speed

Goals

• Be able to rearrange the formula for speed
• Name the steps to use when doing a calculation
• Explain what is meant by average speed, and be able to exercise it

• Apply the formula for speed in calculations, including having to rearrange it