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Lesson 10 – Recap + calculations
1.4 Gravity
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Natuurkunde / Scheikunde
Middelbare school
havo, vwo
Leerjaar 1
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1.4 Gravity
Slide 1 - Diapositive
This lesson
Discussing the homework
Recap 1.4
Making calculations
Worksheet mass and weight
Slide 2 - Diapositive
Learning goals
Explain the cause of gravity
Describe the difference between mass and weight.
Explain gravitational field strength
Calculate weight, mass and gravitational field strength
Slide 3 - Diapositive
Learning goals
Be able to rearrange the forumla for weight and apply this in calculations.
Learn a procedure for doing calculations.
Slide 4 - Diapositive
Discussing the homework
Slide 5 - Diapositive
Recap 1.4
Slide 6 - Diapositive
Answer these 3 questions
What is the cause of the force of gravity?
Describe the difference between mass and weight.
What determines the gravitational field strength of a planet? What is its unit?
Slide 7 - Diapositive
What is the cause of the force of gravity?
All masses exert a force on all other masses.
This force depends on:
the amount of mass
The distance between the two masses
Slide 8 - Diapositive
Slide 9 - Diapositive
Describe The difference between mass and weight
Mass:
The amount of matter something is made off.
Weight:
The strength of the force of gravity on a specific object.
Slide 10 - Diapositive
Slide 11 - Diapositive
What determines the gravitational field strength of a planet? What is its unit?
The mass of the planet:
A planet with a larger mass exerts a larger attractive force on other masses.
Unit: N/kg
Un
Slide 12 - Diapositive
w
e
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g
h
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m
a
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⋅
g
r
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g
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(N)
(kg)
(N/kg)
Slide 13 - Diapositive
w
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g
h
t
=
m
a
s
s
⋅
g
r
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a
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a
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f
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(N)
(kg)
(N/kg)
Slide 14 - Diapositive
w
e
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g
h
t
=
m
a
s
s
⋅
g
r
a
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a
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f
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g
h
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w
=
m
⋅
g
(N)
(kg)
(N/kg)
Slide 15 - Diapositive
w
e
i
g
h
t
=
m
a
s
s
⋅
g
r
a
v
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a
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w
=
m
⋅
g
W: weight (N)
m: mass (kg)
g: gravitational field strength (N/kg)
(N)
(kg)
(N/kg)
Slide 16 - Diapositive
w
=
m
⋅
g
6
=
3
⋅
2
Slide 17 - Diapositive
w
=
m
⋅
g
6
=
3
⋅
2
Exercise
Rearrange the formula to use it to calculate:
a) mass
b) gravitational field strength
Slide 18 - Diapositive
A procedure for doing calculations
Given
Asked
Formula
Calculation
Answer
Slide 19 - Diapositive
Exercise
Procedure
Given
Asked
Formula
Calculation
Answer
A man has a weight of 813.4 N on earth. The gravitational field strength on earth is
9.8 N/kg. Calculate his mass.
Slide 20 - Diapositive
Worksheet mass, weight and gravitational field strength
This is the homework for next lesson
Slide 21 - Diapositive
Learning goals
Be able to rearrange the forumla for weight and apply this in calculations.
Learn a procedure for doing calculations.
Slide 22 - Diapositive
Homework
The worksheet about mass, weight and gravitational field strength
Slide 23 - Diapositive
Slide 24 - Diapositive
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