1. Emily is riding her bicycle. Which BEST explains why only some of the energy used to pedal her bicycle is transferred into forward motion of the bicycle?

F The energy of the bicycle tire is applied in a circular motion.

G The energy of the bicycle is transferred to only one wheel.

H The gears and chain of the bicycle are covered with oil.

J The gears and chain of the bicycle generate friction.

2. A wind generator transfers wind energy into electrical current.

 How does the amount of energy in the electrical current compare to the amount of wind energy that turns the blades on the wind generator?

A There is less energy because some heat is produced in the transfer.

B There is less energy because wind does not blow with a constant force.

C There is more energy because electrical energy can be stored in batteries.

D There is more energy because there is more than one blade on the generator.

http://www.bbc.co.uk/schools/ks3bitesize/science/energy_electricity_forces/energy_transfer_storage/activity.shtml

Roller Coaster Physics Gizmo

Explain the Energy transformation

For each device, students should identify and explain the energy transformations that occur.

Teacher Note: Ideally, the students will have the opportunity to explore physical examples the energy transformations. Alternative transformations may be substituted based on local supplies/materials.