NNSS U4 - review II

Explore energy! Understand light, electricity, sound, and different energy sources with our fun science review.

1. Where does the most of our natural light come from? The Moon. The Sun. Lightnings. Nuclear power stations. 2. How do batteries produce electrical energy? By changing mechanical energy into electricity. By changing electricity into mechanical energy. By changing chemical energy into electricity. By changing nuclear energy into electricity. 3. What forms of energy does a juice have? Potential energy. Chemical energy. Potential and chemical energy. Superenergy. 4. Why does sound not travel through outer space? Because there's no one to hear it. Because it is dark. Because sound can't travel through the vacuum. Because light travels faster than sound. 5. Read the situations. Are they examples of potential energy or kinetic energy? a) A football is rolling down a big hill. Potential energy. Kinetic energy. b) You are holding a book over your head. Potential energy. Kinetic energy. c) You recharged your phone's battery. Potential energy. Kinetic energy. d) You are white water rafting down a river. Potential energy. Kinetic energy. 6. Are these sentences true or false? a) Both oil and biomass come from organic materials. True. False. b) Burning natural gas does not cause any air pollution. True. False. c) Uranium is a renewable source of energy, but it is dangerous. True. False. d) Solar panels are effective because they can produce electricity everywhere, at any time. True. False. e) Wind turbines do not pollute, but they can be very harmful to wildlife habitats. True. False. f) Biomass is a renewable source of energy, but it contributes to global warming. True. False.