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Warm Up: Get notes handout from front desk. Number 1-9 on a sheet of paper

Warm Up: Get notes handout from front desk. Number 1-9 on a sheet of paper. Homework: Directed Reading Packet: Energy conversions (4-6). Energy Conversions. Energy Conversion - . a change from one form of energy to another. Some energy is always wasted (converted into thermal energy).

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Warm Up: Get notes handout from front desk. Number 1-9 on a sheet of paper

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  1. Warm Up: Get notes handout from front desk.Number 1-9 on a sheet of paper Homework: Directed Reading Packet: Energy conversions (4-6)

  2. Energy Conversions Energy Conversion - a change from one form of energy to another Some energy is always wasted (converted into thermal energy) Let's look at some examples:

  3. roller coaster Kinetic to Potential (and vice versa) pendulum trampoline

  4. break down energy from food; use it to be active and to maintain constant body temperature Light to Chemical photosynthesis Chemical to Kinetic & Thermal

  5. batteries light bulb toaster microphone Chemical to Electrical Electrical to Light & Thermal Sound to Electrical

  6. Energy Conversions Pages 128 to 133 Answer in complete sentences. (1)How do machines make work easier? (2)What is the point of having different sized gears on a bike? (3)When you ride a bike, why is it that some of your energy is wasted? (4)Why is it impossible for any machine to be 100% energy efficient? (5)What happens to some of the potential energy as you go up and down on a roller coaster? (6)What is meant by “conservation of energy”? (7)Is it possible to make a perpetual motion machine? Explain.

  7. Machines Machines  can make work easier by changing the size and/or direction of the force required to do the work Machines… transfer and convert energy. Machines DO NOT… increase energy.

  8. bicycle • hammer • nutcracker Simple Machines Examples:

  9. nutcracker Simple Machines Examples: • bicycle • hammer

  10. Conservation of Energy Law of Conservation of Energy  energy cannot be created or destroyed • Energy is just converted from one form to another. • All of the energy put into a process still exists somewhere. • Some energy is always converted into thermal energy.

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