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## Kinetic and Potential Energy

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**Kinetic and Potential Energy**Physics 6(B)**Learning Objectives**• Explain the differences between kinetic and potential energy and their sources • Describe situations involving kinetic and potential energy • Explain how potential energy is transformed into kinetic energyand kinetic energy is transformed into potential energy • Kinetic and Potential Energy**Kinetic Energy(KE) – the energy of an object due to motion**• Measured in joules, J • Dependent on: • Mass (m ) • Velocity (v) Defining Kinetic Energy**At the top, a skateboarder has no kinetic energy**• Kinetic energy increases as the skateboarder moves downwards and speeds up • At the bottom, a skateboarder has maximum kinetic energy • Kinetic energy decreases as the skateboarder moves upwards and slows down • Kinetic Energy**Potential Energy(PE) – the energy of a system due to its**position • Measured in joules, J • Dependent on: • Mass (m ) • Height above ground (h ) • Acceleration due to gravity (g ) Defining Potential Energy**On the ground, each block has no potential energy**• On the stairs, the yellow object has the least potential energy and the green object has the most potential energy • Potential Energy**Energy can be transformed from one type to another**• In the picture on the left, the ball’s potential energy is at a maximum and its kinetic energy is at a minimum • In the picture on the right, the ball’s kinetic energy is at a maximum and its potential energy is at a minimum • Energy Transformation**Transformation between kinetic and potential energy is never**perfect • Energy can be “lost” when it is transformed out of a system • Some kinetic and potential energy of the roller coaster is transformed into heat and sound • Energy Transformation**Learning Objectives**• Explain the differences between kinetic and potential energy and their sources • Describe situations involving kinetic and potential energy • Explain how potential energy is transformed into kinetic energy and kinetic energy is transformed into potential energy • Kinetic and Potential Energy