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Day 1.

Published bySharyl Gilmore Modified over 6 years ago

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Presentation on theme: "Day 1."— Presentation transcript:

1 Day 1

2 Energy is the ability to cause change!
What connections can we make between energy and matter? Energy is the ability to cause change!

3 Kinetic Energy Energy in the form of motion
What connections can we make between energy and matter? Kinetic Energy Energy in the form of motion The amount of kinetic energy an object has depends on its mass and its speed What does this sound familiar to?

4 Kinetic Energy Kinetic energy = 1 x mass x speed 2 2
What connections can we make between energy and matter? Kinetic Energy Kinetic energy = 1 x mass x speed 2 2 Joule - the SI unit used to measure energy Ex: What is the KE if the mass is 3 kg and the speed is 2 m/s? What happens to the energy when you double the velocity?

5 Potential Energy Stored due to height, chemical bonds, and/or springs.
What connections can we make between energy and matter? Potential Energy Stored due to height, chemical bonds, and/or springs. When the yo-yo is halfway, does it have p or k?

6 Day 2

7 Elastic Potential Energy
How can I distinguish between different types of energy? Elastic Potential Energy Energy stored by things that stretch or compress

8 provide energy for your body?
How can I distinguish between different types of energy? How does food provide energy for your body?

9 Chemical Potential Energy
How can I distinguish between different types of energy? Chemical Potential Energy Energy stored in the chemical bonds between atoms

10 Gravitational Potential Energy (GPE)
How can I distinguish between different types of energy? Gravitational Potential Energy (GPE) Energy stored by things that are above Earth

11 Gravitational Potential Energy (GPE)
How can I distinguish between different types of energy? Gravitational Potential Energy (GPE) The amount of GPE an object has depends on its mass, the acceleration due to gravity, and its height above ground GPE = mass x m/s2 x height Ex. What is the GPE if the mass is 2 kg and the height is 3 m?

12 Day 3

13 Transforming Electrical Energy
Why can’t energy be destroyed? Transforming Electrical Energy Lightbulbs transform electrical energy into light and thermal energy (heat) Alarm Clocks transform electrical energy into sound Other examples you can think of? 13

14 Transforming Chemical Potential Energy
Why can’t energy be destroyed? Transforming Chemical Potential Energy Car engines transform chemical energy into kinetic energy *People convert that chemical energy into kinetic energy *Plants convert light energy into chemical energy. 14

15 Exothermic and Endothermic
Why can’t energy be destroyed? Exothermic and Endothermic Exothermic: A chemical reaction that gives off heat--HOT Endothermic: A chemical reaction that absorbs heat --COLD 15

16 Why can’t energy be destroyed?
The Human Body The body changes chemical potential energy into mechanical energy, electrical energy, and thermal energy The calorie (C) 1 C = 4,184 J 1 g of fat = 9 C = 37,656 J 1 g of carbs and proteins = 4 C = 16,736 J 16

17 Why can’t energy be destroyed?
17

18 Remember… **What did the Law of Conservation of Momentum say?
Why can’t energy be destroyed? Remember… Quiz 3/2 **What did the Law of Conservation of Momentum say? Total momentum is conserved and does not change. Therefore momentum can be transferred from one object to another. 18

19 Law of Conservation of Energy
Why can’t energy be destroyed? Law of Conservation of Energy Energy cannot be created or destroyed. Energy can be transformed from one type to another. The total amount of energy in the universe does not change! 19

20 Law of Conservation of Energy
Why can’t energy be destroyed? Law of Conservation of Energy Law is always true, even when it seems like it’s not. Ex. Rollercoaster Friction converts mechanical energy into thermal energy, that’s why they can’t run forever! 20

21 Law of Conservation of Energy
Why can’t energy be destroyed? Law of Conservation of Energy Converting mass into energy Fission and fusion are nuclear reactions. They convert a small amount of mass in a nucleus into an ENORMOUS amount of energy. E=mc2 21

22 Why can’t energy be destroyed?
E=mc2 E=mc2 E=mc2 E=mc2 22

23 Day 4

24 Mechanical Energy Equation
How can the “mechanical energy” of a system be explained in terms of its kinetic and potential energy? Mechanical Energy Equation Mech.Energy = Potential energy + Kinetic Energy Ex. If a hammer has 15 J of mechanical energy and 10 J of kinetic energy, what is the potential energy? 24

25 Falling objects Ex. Apple falling from a tree
How can the “mechanical energy” of a system be explained in terms of its kinetic and potential energy? Falling objects Ex. Apple falling from a tree Gravitational potential energy is converted to kinetic energy Mechanical energy does not change 25

26 How can the “mechanical energy” of a system be explained in terms of its
kinetic and potential energy? Projectile Motion Kinetic Energy gets transformed into GPE, then back to kinetic energy Mechanical energy does not change 26

27 How can the “mechanical energy” of a system be explained in terms of its
kinetic and potential energy? Swings Potential energy is transformed to kinetic energy, then back to potential energy Mechanical energy does not change 27

28 Day 5

29 Rollercoaster Lab (2 Day Lab Activity)
Discuss the Grading Rubric. Work in groups of no more than 4 people. (Points will be deducted for groups of 5 or more!!!) Return all supplies to the counter.

30 Day 6

31 Rollercoaster Lab (2 Day Lab Activity)
Discuss the Grading Rubric. Work in groups of no more than 4 people. (Points will be deducted for groups of 5 or more!!!) Return all supplies to the counter. 31

32 Day 7

33 How can thermal energy be transferred?
Conduction When particles are heated up, they move faster and bump into neighboring particles. Heat is transferred without moving matter.

34 How can thermal energy be transferred?
Conduction Solids and liquids conduct better than gases because the particles are closer together. Metals are the best conductors, because their electrons are not bound.

35 How can thermal energy be transferred?
Convection Transfer of thermal energy in a fluid by the movement of warmer and cooler fluids from place to place. Fluids can be liquid OR gas. When fluids get hotter, they expand and density decreases.

36 How can thermal energy be transferred?
Convection Which direction does the water circulate?

37 How can thermal energy be transferred?
Heat transfer creates air and ocean currents that influence climate.

38 Day 8

39 How is all energy connected to the sun?
Radiation Transfer of heat by electromagnetic waves.

40 How is all energy connected to the sun?
Radiations Can travel through empty space from the Sun to the Earth (radiant energy) Can be absorbed or reflected. Radiation passes more easily through gases than in solids or liquids.

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