Energy stores and transfersIB MYP Sciences: Mind map

Exam questions on Energy stores and transfers

1. A child in Nairobi winds up a clockwork toy car, puts it on the floor and lets it go. The toy speeds across the floor, then gradually slows down and stops.
   Describe the energy transfers that happen from the moment the spring is released until the car stops.2 marks
2. A hydroelectric power station in Norway has a reservoir high up a mountain. Water runs down large pipes to turbines at the bottom, and the turbines turn a generator that supplies electricity to nearby towns.
   Describe the energy transfers from the water at the top of the pipes to the electricity leaving the generator.2 marks
3. A class in Melbourne compares three bouncing balls, X, Y and Z. Each ball is dropped from a height of 1.00 m onto the same hard floor and the height it rebounds to is measured. The students predict that a ball that rebounds lower transfers more energy to the surroundings. The mean rebound heights were 0.80 m for ball X, 0.55 m for ball Y and 0.30 m for ball Z.
   Identify the independent variable, the dependent variable and one control variable in this investigation.3 marks