4. Complete the sentences related to energy changes.
1. In a clockwork toy, the energy stored in a compressed spring changes into
2. Plants change light energy into
3. In a thermal-power station, heat energy changes into
4. When a fuel combines with oxygen, the energy stored in it changes into
and
5. When an arrow is shot from a bow, the energy stored in the stretched bow changes int
Answers
Answer:
(1) answer:-Think back to the pop-up toaster example. When you push down the toaster's lever, you compress a spring inside the toaster. It takes work to change the position of the lever and compress the spring. When the spring releases, the elastic potential energy is transformed into kinetic energy.
(2) answer:-Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
(3) answer:-A thermal power station is a power station in which heat energy is converted to electric power. In most, a steam-driven turbine converts heat to mechanical power as an intermediate to electrical power. Water is heated, turns into steam and drives a steam turbine which drives an electrical generator
(4) answer:-Combustion (burning) is essentially a chemical reaction between a fuel and oxygen. Atoms in the fuel are held together by chemical bonds. When conditions are right, the atoms start to break apart from one another, setting off a chain reaction that releases more heat, causing more atoms to break away.
(5) answer:-By virtue of the string of the bow being stretched, the amount of energy that it took to stretch the string is stored in the string as long as the force keeping it stretched is intact. When the force is released, the stored potential energy is converted to Kinetic Energy, which is the energy of motion.
Explanation:
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