1.4 gravity
§1.4 Gravity
Gravity
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Slide 1: Diapositive
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 1
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§1.4 Gravity
Gravity
Slide 1 - 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 2 - Diapositive
of gravity?
See the video, figure out what their final conclusion is on what gravity is. Write it down after the video.
Slide 3 - Diapositive
Slide 4 - Vidéo
Attractive force between any two object with mass.
Slide 5 - Diapositive
The difference between
mass and weight
Slide 6 - Diapositive
Slide 7 - Diapositive
Mass and weight
Mass
- How much matter something is made of
- does not change with location
- Measured in kg
Weight
- the force of gravity acting on a specific object
- Depends on the gravational field strength something is in
- Measured in newton
Slide 8 - Diapositive
- all mass applies an attractive force on all other mass. The gravitational force.
- the strength of this attractive force depends on the amount of mass (in kg) and the distace.
- The more mass something is made of, the greater its gravitational force is on other masses.
The larger the distace the lesser the force of gravity.
- the amount of newtons a body of mass applies to other masses per kilogram is called its gravitational field strength (N/kg)
Gravitational force
Slide 9 - Diapositive
Is the force experienced(in N) per unit mass by an object. And is measured in (N/kg)
Gravitational field strength
Slide 10 - Diapositive
The amount of newtons a body of mass applies to other masses per kilogram (N/kg)
Gravitational field strength
For example:
The gravitational field strength on Earth is 10 N/kg. Means a mass of 1 kg experiences a force of 10 N.
The gravitational field strength on Jupiter is 23 N/kg
Slide 11 - Diapositive
weight=mass⋅gravitationalfieldstrenght
(N)
(kg)
(N/kg)
Slide 12 - Diapositive
weight=mass⋅gravitationalfieldstrenght
w=m⋅g
(N)
(kg)
(N/kg)
Slide 13 - Diapositive
weight=mass⋅gravitationalfieldstrenght
w=m⋅g
- W: weight (N)
- m: mass (kg)
- g: gravitational field strength (N/kg)
(N)
(kg)
(N/kg)
Slide 14 - Diapositive
Slide 15 - Diapositive
11.3 kg
21.7 kg
44.8 kg
Weight (N)
On earth
Weight (N)
On mars
Weight (N)
On planet Z
135.6
260.4
537.6
Weight = mass x gravitational field strength
See the table on the right.
a) fill in the weight of the masses on earth and mars.
b) calculate the gravitational field strength of planet Z
Gravitational field strength earth = 10 N/kg
Gravitational field strength mars = 3.7 N/kg
Slide 16 - Diapositive
11.3 kg
21.7 kg
44.8 kg
Weight (N)
On earth
113
217
448
Weight (N)
On mars
Weight (N)
On planet Z
135.6
260.4
537.6
Weight = mass x gravitational field strength
See the table on the right.
a) fill in the weight of the masses on earth and mars.
b) calculate the gravitational field strength of plante Z
Gravitational field strength earth = 10 N/kg
Gravitational field strength mars = 3.7 N/kg
Slide 17 - Diapositive
11.3 kg
21.7 kg
44.8 kg
Weight (N)
On earth
113
217
448
Weight (N)
On mars
41.81
80.29
165.76
Weight (N)
On planet Z
135.6
260.4
537.6
Weight = mass x gravitational field strength
See the table on the right.
a) fill in the weight of the masses on earth and mars.
b) calculate the gravitational field strength of plante Z
Gravitational field strength earth = 10 N/kg
Gravitational field strength mars = 3.7 N/kg
Slide 18 - Diapositive
w=m⋅g
6=3⋅2
Slide 19 - Diapositive
w=m⋅g
6=3⋅2
Exercise
Rearrange the formula to use it to calculate:
a) mass
b) gravitational field strength
Slide 20 - Diapositive
11.3 kg
21.7 kg
44.8 kg
Weight (N)
On earth
113
217
448
Weight (N)
On mars
41.81
80.29
165.76
Weight (N)
On planet Z
135.6
260.4
537.6
Weight = mass x gravitational field strength
Calculate the gravitational field strength of planet Z
Gravitational field strength earth = 10 N/kg
Gravitational field strength mars = 3.7 N/kg
Slide 21 - Diapositive
Homework
Workbook exercises 1.4
Exercise 1, 2, 3 and E
Slide 22 - 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
