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## Starter

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**Starter**Directions: Copy the following examples. Answer using the following terms: Mechanical, Thermal, Chemical, Electrical • Hydroelectric dam • A horse pulling a cart • A thermos of hot coffee • The bonds holding atoms together in food**Review**• Directions: Complete the statements below. • What is the formula for work? • What is the formula for power? • What is the work if a horse pulls a box 5m with a force of 10 N? • It takes 8 seconds for a pulley system to lift a load with 400 N.m. How much power is required?**Review**Directions: Draw the following table. Match the example up with the correct simple machine type: Wedge, Lever, Wheel and Axle`, Pulley Example Type • Shovel • Axe • Doorknob • Window blinds**What Energy Form?**• Directions: Label the picture with the correct energy form. Electrical, nuclear, Thermal, and Mechanical a. b. c. d.**Directions: Each object starts with electrical energy but**it converts that energy into another energy. What energy type does it convert into? Thermal, Mechanical, or Electromagnetic**Kinetic vs. Potential**Kinetic energy Potential Energy Stored (Has the potential to move) The higher the object the greater the potential energy. PE=m(g)(h) PE=Potential m= mass g= gravity h= height Unit=Joule • Motion • The closer the object is to the ground the greater the kinetic energy. • KE=1/2(m)v2 KE= kinetic m= mass v= velocity Unit=Joule**The ball starts at rest waiting (PE) to move. Then with a**force it moves down the hill (KE).**If an object has PE it will have KE. You cannot have one**without the other.**KE and PE**http://www.teachersdomain.org/resource/hew06.sci.phys.maf.rollercoaster/**Exit Slip**Directions: Copy the examples and label which one is KE or PE. 1. a moving skateboard 2. a dry cell of a battery 3. a rock at the edge of a cliff 4. an acorn hanging from an oak tree 5. a glass of milk 6. a person climbing a ladder 7. Gasoline 8. a piece of celery 9. a basketball passing through a hoop 10. blowing wind