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Forces
Forces
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Slide 1:
Slide
Natuurkunde
Middelbare school
vwo
Leerjaar 3
This lesson contains
31 slides
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text slides
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Lesson duration is:
60 min
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Items in this lesson
Forces
Slide 1 - Slide
Paragraph 1.1
Using levers
Slide 2 - Slide
Learning goals
You know that Force is the quantity and Newton it's unit.
You can calculate the magnitude of gravity by using Fg= m × g.
You know why we use a lever and you can explain how it works.
You can explain what the arm of the force is.
You can explain that an object is stable when its centre of gravity is above the support surface.
Slide 3 - Slide
Forces
Force (
F
) is the quantity, we measure forces in the unit Newtons (
N
)
You can't see forces, only its results. For example:
The objects changes speed
The object changes direction
The objects deforms
Slide 4 - Slide
Gravitational force
A form of force is gravity, we can calculate the magnitude of the gravity with the formula:
Fg = m × g
Fg= the gravity in Newtons
m= the mass in kilograms
g = 9.81 N/kg on earth
Gravity works from the
centre of gravity
Slide 5 - Slide
Using levers
We use levers to increase the working force. For example a bottle opener.
The tools have a:
fulcrum or pivot point
a short end where the working force acts
a long end where the muscular force acts
Slide 6 - Slide
Slide 7 - Slide
Paragraph 1.2
Calculations with levers
Slide 8 - Slide
Learning goals
Explain the function of a counter weight
Check when a lever is in equilibrium / balance
Do calculations using the law of the lever: F1 × r1 = F2 × r2
Slide 9 - Slide
Ratio of working force and muscular force
To maximise the working force, you need to make sure the arm of your muscular force is as large as possible.
Small arm, big force
Big arm, small force
Slide 10 - Slide
Equilibrium
Slide 11 - Slide
Counterweights
Draw bridges use a counterweight.
Slide 12 - Slide
Slide 13 - Slide
Paragraph 7.1
Recognising forces
Slide 14 - Slide
Learning goals
You can name different types of forces and identify them with a symbol.
Name and recognise three kind of consequences of the actions of forces.
Indicate that a force always works on an object.
Indicate the difference between plastic and elastic deformation.
Slide 15 - Slide
Effects of forces
Slide 16 - Slide
Deformation
Slide 17 - Slide
Types of forces
Slide 18 - Slide
Assignments
worksheets: 3,5,7,8, 12
Slide 19 - Slide
Slide 20 - Slide
Paragraph 7.2
Measuring and drawing forces
Slide 21 - Slide
Learning goals
You can draw a force as a vector with magnetude, direction and point of application.
You can apply a force scale and express a force in Newton (N).
Slide 22 - Slide
Properties of forces
Slide 23 - Slide
Force scale
Slide 24 - Slide
Assignments
worksheets: 20,21
Slide 25 - Slide
Slide 26 - Slide
Paragraph 7.3
Gravity
Slide 27 - Slide
Learning goals
You know the value of g in the netherlands (9.81)
You can calculate the gravitational force on an object with a formula.
Slide 28 - Slide
Mass and gravity
Slide 29 - Slide
Assignments
worksheets: 32,34,37,39
Slide 30 - Slide
Slide 31 - Slide
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