recap 2.1 and 2.2

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 3

recap 2.1 and 2.2

-forces

-gravity

-springs

-drawing forces

-adding forces

forces

forces are named after their source.

forces can:	force has:
deform (plastic or elastic)	a magnitude
change speed	a starting point
change direction	a direction

Opdracht :Sleep de soort kracht naar de passende afbeelding.

friction

spring force

gravitational force

static force

muscle force

gravity

Fg = m*g

g = 9.81 N/kg on earth

variable	symbol	unit	symbol
force	F	newton	N
gravitational constant	g	newton per kg	N/kg
mass	m	kilogram	kg

Force

Mass

extension

Spring 

constant

Newton

kilogram

x

C

N/cm

F

A gravity of 31 N acts on a stone.
Calculate the mass of the stone.
give an answer in twe decimals

spring

C=F/x

variable	symbol	unit	symbol
extention	x	meter	m
spring force	Fs	newton	N
spring constant	C	newton per meter	N/m

A spring has an extension of 20 cm with a mass of 2 kg. Calculate the spring constant. C=F/x

drawing forces

a force is drawn with an arrow of 20 cm. it reprecents a force of 100N. what is the scale?

adding forces

if the forces are in the same line, you can add or substract them

if not -> parallelogram

In the figure you can see forces acting upon a box. Which of the following statements is true?

1. The box moves to the left.
2. The box moves to the right.
3. The box is changing speed.
4. the box is standing still.

adding forces worksheet