1. What are the two different types of satellites?
Gravity
Developing: Define the difference between mass and weight.
Secure: Calculate the force of gravity on different planets.
Exceeding: Illustrate the forces of gravity on Earth.
Entrance Activity
What are the two different types of satellites?
Tool Box - Keywords
Weight
Mass
Gravity
Gravitational field
Attraction
Entrance Music

2. Teacher Explanation
Pull to Earth
Why do the people on the Earth remain on it, even when they are upside down?
Gravity
the force that attracts an object towards the centre of the Earth, or towards any other physical body having mass.

3. Mass and Weight Mass Weight
Teacher Explanation
Mass and Weight
Mass
This is the amount of matter that an object contains. This is measured in kilograms.
Weight
This is a measure of the force of gravity acting on an objects mass. This is measured in Newton's.

4. Quick Check Define the term “Gravity”.
Learning Activity
Quick Check
Define the term “Gravity”.
Describe the difference between Mass and Weight.
Draw a picture to show the forces acting on people, standing on the Earth.

5. What are the two different types of satellites?
Gravity
Developing: Define the difference between mass and weight.
Secure: Calculate the force of gravity on different planets.
Exceeding: Illustrate the forces of gravity on Earth.
Entrance Activity
What are the two different types of satellites?
Tool Box - Keywords
Weight
Mass
Gravity
Gravitational field
Attraction
Entrance Music

6. Student reading activity
Man on the Moon
On Earth, Neil Armstrong had a weight of 920N and a mass of 92kg. When Neil went to the moon he found he could jump significantly higher and further. This was due to him having a reduced weight. The gravity on the moon is about a of the gravity on earth, so although his mass stayed the same, he weighed significantly less due to the reduced gravity.
Student reading activity

7. Calculating Weight Weight (N) = Mass(kg) x Gravity(N/Kg)
Teacher Explanation
Calculating Weight
Weight (N) = Mass(kg) x Gravity(N/Kg)
Mr Helps has a mass of 88kg. On Earth, gravity measures 9.81N/kg. Calculate his weight on Earth.
Weight (N) = Mass(kg) x Gravity(N/kg)
Weight (N) = 88(kg) x 9.81(N/kg)
(N) = 88(kg) x 9.81(N/kg)

8. Learning Activity
Different Planets
Arrange the planets in order of gravitational strength.
Calculate the weight of Mr Helps on each of the planets.

9. What are the two different types of satellites?
Gravity
Developing: Define the difference between mass and weight.
Secure: Calculate the force of gravity on different planets.
Exceeding: Illustrate the forces of gravity on Earth.
Entrance Activity
What are the two different types of satellites?
Tool Box - Keywords
Weight
Mass
Gravity
Gravitational field
Attraction
Entrance Music

10. Gravity and Orbits
Learning Activity

11. Plenary Activity
Which is Heavier?
Which of the objects listed below would be the most difficult to lift off the ground?
A 5kg Fish on Earth (10 N/Kg)
A 2.3kg football on Jupiter(25 N/kg)
A 2,700kg Elephant on Pluto (0.62 N/Kg)