# Lesson 10 – Recap + calculations

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

In deze les zitten 24 slides, met tekstslides.

## Onderdelen in deze les

1.4 Gravity

#### Slide 1 -Tekstslide

This lesson
•  Discussing the homework
•  Recap 1.4
•  Making calculations
• Worksheet mass and weight

#### Slide 2 -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 3 -Tekstslide

Learning goals
• Be able to rearrange the forumla for weight and apply this in calculations.

• Learn a procedure for doing calculations.

#### Slide 4 -Tekstslide

Discussing the homework

Recap 1.4

#### Slide 6 -Tekstslide

•  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 -Tekstslide

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 9 -Tekstslide

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 11 -Tekstslide

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 -Tekstslide

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

#### Slide 13 -Tekstslide

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

#### Slide 14 -Tekstslide

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

#### Slide 15 -Tekstslide

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

w=mg
6=32

#### Slide 17 -Tekstslide

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

a) mass

b) gravitational field strength

#### Slide 18 -Tekstslide

A procedure for doing calculations
1. Given
3. Formula
4. Calculation

#### Slide 19 -Tekstslide

Exercise
Procedure
1. Given
3. Formula
4. Calculation
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 -Tekstslide

Worksheet mass, weight and gravitational field strength

• This is the homework for next lesson

#### Slide 21 -Tekstslide

Learning goals
• Be able to rearrange the forumla for weight and apply this in calculations.

• Learn a procedure for doing calculations.

#### Slide 22 -Tekstslide

Homework
The worksheet about mass, weight and gravitational field strength