Potential and Kinetic Energy. Energy. The ability to do work The Two types of mechanical energy Potential - stored Kinetic - moving. KeslerScience.
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2 Potential and Kinetic Energy Energy The ability to do work The Two types of mechanical energy Potential - stored Kinetic - moving
3 What is Work? Work - occurs when a force causes an object to move in the direction of that force When one object does work on another, energy is transferred. Work is a transfer of energy
4 Tennis player can do work on her racket because she has energy. Energy transfers from person to racket. The racket gains the ability to do work on the ball. Racket hits ball, energy is transferred from racket to ball.
5 Potential and Kinetic Energy Potential Energy Stored energy in an object Due to position or shape Energy of position
6 1) The energy it takes to pull back the bow is stored until the bow is released! 2) The energy is then transferred to the arrow.
7 Potential and Kinetic Energy Gravitational Potential Energy When you life an object, you do work on it by using a force that opposes gravity A Which ball has the greatest potential Energy? B Depends on the weight of the object and its height above the earth s surface. PE g = (mass)(height)(force of gravity)
8 Quick Action Get with a partner and discuss the last theme park ride you were on. Make a list of the points on each ride where you had the greatest potential energy.
9 Potential and Kinetic Energy Kinetic Energy Energy of motion Dependent on the mass and velocity (speed) of an object
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11 H = 10m H = 20m Potential and Kinetic Energy Kinetic Energy The amount of kinetic energy is determined by its speed/velocity and its mass. The faster an object in moving the greater its kinetic energy. A Which object has the greatest speed? B
12 Potential and Kinetic Energy Kinetic Energy The greater the mass the greater the kinetic energy. Which ball has the greatest kinetic energy? A B
13 Kinetic Energy = ½ *m*v 2 25 m/s 20 m/s 25 m/s 1 Which vehicle has the most kinetic energy? 2 Why? Greatest mass and high velocity 3 Which vehicle has the least kinetic energy? 4 Why? Lower mass and least velocity The big truck Smaller car on left
14 Quick Action Get back with your partner to discuss the last theme park ride you were on. This time make a list of the points on each ride where you had the greatest kinetic energy.
15 Mechanical Energy - the total energy of motion and position of an object (sum of the KE and PE) MECHANICAL ENERGY = Potential energy + Kinetic energy ME = PE + KE Can be all potential Can be all kinetic Can be both! As potential energy increases (or decreases), kinetic energy decreases (or increases) As potential or kinetic energy changes, mechanical energy stays the same
16 Quick Action INB Template Cut out the Venn Diagram and title. Glue the title at the top of page in INB.
17 Venn Diagram Potential Energy Energy of position Not moving Increases based on position or height Example: Both Types of Energy Kinetic Energy Energy of motion Increases as motion increases Example: Transforms into other types of energy
18 Potential and Kinetic Energy Transformation of Energy Bouncing Ball Several energy transformations happen when a ball is dropped on surface and bounces up again. PE - maximum KE - none PE - decreasing KE - increasing PE none KE - maximum PE maximum KE - none
19 Potential and Kinetic Energy Transformation of energy Pendulum Several energy transformations take place as the pendulum bob swings. A PE maximum - KE minimum B KE maximum - PE minimum C PE maximum - KE minimum A B C
20 Quick Action INB Template Cut out the next three templates. Glue bottom template into your INB. Glue middle along the skinny tab one on top of the other. The roller coaster will be glued on top and upside down so that it flips up and can be seen while working on sheet two. Bottom Middle Top
21 Potential and Kinetic Energy Transformation of energy Roller coaster
22 Tuesday December 20, 2016 Talk about it Tuesday! What do you want to be when you grow up?
23 Potential and Kinetic Energy Transformation of Energy Roller coaster PE = 100% KE = 100% PE KE PE KE PE = 75% KE = 25% KE = 75% PE = 25% PE KE PE KE
24 Quick Action 1. Stand up and find a partner to work with. 2. Brainstorm a way to demonstrate potential and kinetic energy to the class. 3. Be able to point out the point in your demonstration when potential/kinetic energy is greatest and least. 4. Sketch your scenario on the bottom page of your ISN packet 5. Share this information with the class as your teacher calls on you.
25 Guided Reading and Section Review Switch papers with someone at your table Grade their work
26 Potential and Kinetic Energy Decide if each situation is an example of kinetic or potential energy. Situation Potential Kinetic Standing on the end of a diving board. Falling from the top of a ladder. X X A rubber band pulled back as far as it can go. Water in a lake behind a dam. Baseball just before it is released by the pitcher X X X
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