2. John is 12 years old
He lives in Chicago, a city in the state of
Illinois
John plays soccer and eats healthy
About John
3. John has a complete breakfast every day.
This gives him _____ energy.
He uses a toaster and a microwave to
prepare his breakfast, so he uses _____
energy.
After breakfast, John takes a hot shower. This
gives him _____ energy.
Exercise
4. One day, John takes a
trip from Chicago to
Seville. To get there,
he flies over
America, the Atlantic
Ocean and Portugal.
5. Exercise
John´s flight lasts for 10 hours and 5 minutes. His
plane starts at O´Hare airport, and reaches 9,000
meters in 9 minutes. The plane stays at the same
height for 8 hours. Then, a storm forces the plane to
go down to 5,000 meters in 5 minutes. John keeps
flying at 5,000 meters for 1 hour and 15 minutes,
then returns to 9,000 meters in 10 minutes. Finally,
the plane lands in 30 minutes, descending 3,000
meters every 10 minutes.
Represent the distance/time graph of the flight.
6. John knows he will have an exam when he gets
back from his vacation in Spain. In order to
prepare for his exam about energy (unit 2), he
solves some problems during his flight.
7. Exercise
a) Calculate the kinetic energy (Ec) the plane
has when it flies at 800 km/h if its mass is 25t.
(1t: ton = 106 kg)
8. b) What is the potential energy of the plane if it
flies at 9,000 meters from the ground?
Exercise
9. c) In addition, calculate the mechanical energy
of the plane.
Exercise
10. While he is in Spain,
John visits his dad at
work.
John´s dad works at a
hydropower plant,
converting the energy
from _____ into
electricity.
