Lesson 7

Chapter 2 Forces

Section 3 Driving forces and resisting forces

This Lesson

Discussing exercises
Newtons first law
Air resistance

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Chapter 2 Forces

Section 3 Driving forces and resisting forces

This Lesson

Discussing exercises
Newtons first law
Air resistance

Slide 1 - Tekstslide

Discussing section 2

exercise 5 and 6

Slide 2 - Tekstslide

Practice exercise

On an experimental setup on the moon a weight with a mass of 5 kilogram is hung on a spring with a spring constant of 0,45 N/m. Calculate the extension of this spring.

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Voyager 2

Link

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Newtons first law

If the resultant force of all the forces is zero (0N), the object is either stationary or it moves along a straight line at a constant speed

Slide 7 - Tekstslide

Air resistance

F^{​ r, a ​ ​} = \frac{​ 1 ​ ​}{​ 2 ​} C^{​ d ​ ​} \cdot ρ \cdot A \cdot v^{​ 2 ​ ​}

F_r,a: Force, resistance, air resistance (n)
C: resistance coefficient (no unit)
ρ: The density of air (or whatever medium the object is traveling through) (kg/m³)
A: area of the object (m²)
v: the speed of object (m/s)

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