- Slides: 19
Kinetic and Potential Energy
Potential Energy Stored energy, due to the interactions between objects or particles. .
Forms of Potential Energy • Gravitational Potential Energy • Elastic Potential Energy • Chemical Potential Energy
Gravitational Potential Energy • The energy STORED between an object and the Earth depends on object’s weight and height. • Dropping a bowling ball from a height of 1 meter causes a greater change than dropping a tennis ball from 1 meter. • Similarly, dropping a bowling ball from 3 meters causes a greater change than dropping the same bowling ball from 1 meter.
Elastic Potential Energy • Energy STORED in objects that are compressed or stretched – Springs – Rubber Bands
Chemical Potential Energy • Food, gasoline, wood, and other substances are made of atoms joined together by chemical bonds. • Chemical Potential Energy is STORED in the chemical bonds between atoms. • Chemical potential energy is released when chemical reactions occur.
Chemistry Example: • Wood • Coal • Oil • Gas
When the position of an object is altered, it creates Potential Energy. • A yo-yo on the table, doesn’t have energy, but when picked up, it alters its position and now it has the ability (or potential) to do work. • A bow doesn’t have the capacity to do work, unless it’s held at an elevated position.
Position Example: Wound-Up Spring Baseball Pitcher
More Examples of Potential Energy: Stretching a rubber band. . -Stores energy Water at the top of a waterfall. . -Stores energy Yo–Yo in held in your hand. . -Stores energy because of position Drawing a Bow… -Stores energy because of position
Potential Energy Converted to Kinetic Energy… When stored energy begins to move, the object now transfers from potential energy into kinetic energy. Standing still Running
Kinetic Energy in motion All moving objects have kinetic energy
Examples of Kinetic Energy • Running • Wood Burning • Rock Falling
More Examples of Kinetic Energy • Shooting a rubber band. • Water falling over the fall. • A Yo-Yo in motion. • Releasing the arrow from the bow.
Summary of What You’ve Learned. . • • Example using a coin: Holding a coin in you hand, alters the coins original position. The coin has potential energy, because it has ability to do work. Dropping the coin in the bank, changes the stored energy into motion. This transfers the coin’s energy from potential to kinetic energy.
Potential energy is increasing while kinetic energy is decreasing Potential energy is decreasing while kinetic energy is increasing The object reached maximum kinetic energy right before it hits the ground!
Pendulum is swinging to the right! Maximum Potential Energy Increasing Kinetic Energy, Decreasing Potential Energy Maximum Kinetic Energy Increasing Potential Energy, Decreasing Kinetic Energy
Click the picture for the video!
RECAP! • Potential- Stored Energy! –Not moving or Highest point • Kinetic- MOVING!