# 1.4 gravity

§1.4 Gravity
Gravity
1 / 23
Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 23 slides, met tekstslides en 1 video.

## Onderdelen in deze les

§1.4 Gravity
Gravity

#### Slide 1 -Tekstslide

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 -Tekstslide

What is the cause

of gravity?
See the video, figure out what their final conclusion is on what gravity is. Write it down after the video.

#### Slide 4 -Video

Attractive force between any two object with mass.

#### Slide 5 -Tekstslide

The difference between

mass and weight

#### Slide 7 -Tekstslide

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 -Tekstslide

• 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 -Tekstslide

Is the force experienced(in N) per unit mass by an object. And is measured in (N/kg)
Gravitational field strength

#### Slide 10 -Tekstslide

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 -Tekstslide

weight=massgravitationalfieldstrenght
(N)
(kg)
(N/kg)

#### Slide 12 -Tekstslide

weight=massgravitationalfieldstrenght
w=mg
(N)
(kg)
(N/kg)

#### Slide 13 -Tekstslide

weight=massgravitationalfieldstrenght
w=mg
• W: weight (N)
• m: mass (kg)
• g: gravitational field strength (N/kg)
(N)
(kg)
(N/kg)

#### Slide 15 -Tekstslide

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 -Tekstslide

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 -Tekstslide

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

w=mg
6=32

#### Slide 19 -Tekstslide

w=mg
6=32
Exercise
Rearrange the formula to use it to calculate:

a) mass

b) gravitational field strength

#### Slide 20 -Tekstslide

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 -Tekstslide

Homework
Workbook exercises 1.4
Exercise 1, 2, 3 and E

#### Slide 22 -Tekstslide

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