Class 9 > Crash Course: Class 9 > Kinetic and Potential Energy
Kinetic and Potential Energy Video Lecture - Crash Course: Class 9
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FAQs on Kinetic and Potential Energy Video Lecture - Crash Course: Class 9
| 1. What is kinetic energy? |  |
Ans. Kinetic energy is the energy possessed by an object due to its motion. It depends on the mass and speed of the object. The formula for calculating kinetic energy is KE = 1/2 * mass * velocity^2.
| 2. What is potential energy? | |
Ans. Potential energy is the stored energy an object possesses due to its position or condition. It can be gravitational potential energy, elastic potential energy, or chemical potential energy. Gravitational potential energy depends on an object's height and mass, while elastic potential energy depends on the stretch or compression of an elastic object.
| 3. How are kinetic and potential energy related? | |
Ans. Kinetic and potential energy are related because they can be converted into each other. When an object falls, potential energy is converted into kinetic energy. Similarly, when an object is lifted, kinetic energy is converted into potential energy. The total mechanical energy (kinetic + potential) of a system remains constant if no external forces are acting on it.
| 4. What are some examples of kinetic energy? | |
Ans. Some examples of kinetic energy include a moving car, a running athlete, a flowing river, a spinning top, or a flying bird. In all these cases, the objects possess kinetic energy due to their motion.
| 5. What are some examples of potential energy? | |
Ans. Some examples of potential energy include a stretched rubber band, a raised weight, a compressed spring, or a roller coaster at the top of a hill. In all these cases, the objects possess potential energy due to their position or condition.
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