Review for Week 18 DCA:

  1. What is biomass? A RENEWABLE ENERGY SOURCE THAT COMES FROM PLANTS AND IS USED TO GENERATE ELECTRICITY.
  2. What is energy? THE ABILITY TO DO WORK
  3. What is potential energy? STORED ENERGY
  4. What is kinetic energy? ENERGY OF MOTION

5. EXAMPLES OF ENERGY TRANSFORMATIONS

STARTING ENERGY TRANSFORMED INTO EXAMPLE POT. ->KIN. YES/NO

CHEMICAL / Heat (thermal) / CHARCOAL BURNING / yes
electrical / MECHANICAL / MIXING BOWL / yes
ELECTRICAL / SOUND / radio / yes
ELECTRICAL / Heat (thermal) / TOASTER OVEN / yes
chemical / HEAT (THERMAL) / LIGHTING A MATCH / yes
mechanical / ELECTRICAL / WINDMILL / yes
ELECTRICAL / Heat (thermal) / HAIR DRYER / yes
electrical / HEAT (THERMAL) / LIGHT BULB / yes

If a hairdryer was being turned OFF, then it would go from Kinetic to Potential.

6. What does the law of conservation of energy state? Energy cannot be created or destroyed it can only change forms through transformation.

  1. In the hydroelectric power plant lab where we built a turbine, what kind of energy transformation is occurring? Potential to Kinetic (mechanical)
  2. Do fossil fuels such as oil or coal cause pollution? Yes
  3. What would be a “cleaner” form of energy? Solar, wind, hydroelectric, biomass, geothermal, nuclear.

10. Name some forms of energy that are nonrenewable: oil, coal, natural gas

11. Name some forms of energy that are renewable: solar, wind, hydroelectric, geothermal, biomass, nuclear.

12. What is a circuit? Acircuit is a path between two or more points along which an electrical current can be carried. How does it convert energy? Potential to kinetic.

  1. Energy appears in two forms. What are they? Potential and kinetic
  2. Read the descriptions below and identify each as potential or kinetic:
  3. The energy that exists before baking soda and vinegar combine to create carbon dioxide gas. ______P______
  4. A child on his way down a playground slide. ______K___
  5. Exploding fireworks. ______K______
  6. Ocean Waves. ______K______
  7. A stunt driver at the top of a ramp. ______P______
  8. The flexed string of an archer’s bow. ______P_____
  9. Boiling water. ______K______
  10. A glowing neon sign. ______K______
  11. The sun. ______K______
  12. The bond between hydrogen and oxygen that creates water. ______P___
  1. Which one is an example of kinetic energy?
  2. A battery
  3. a rollercoaster at the top of a hill
  4. a bike rider in a race
  5. a stretched rubber band
  6. Which one is an example of potential energy?
  7. the wind
  8. a battery
  9. a child sliding down a slide
  10. boiling water
  11. Where do you have the most potential energy?
  12. at the bottom of a hill
  13. on the 2nd turn of the rollercoaster
  14. at the very top of a hill
  15. just before you finish a ride
  16. If you are bouncing a ball, at what point do you have the greatest kinetic energy?
  17. right before it hits the ground
  18. when it is in your hand
  19. right after it leaves your hand
  20. when it hits someone else’s hand.
  21. When a battery is running low, it has decreasing potential energy.
  22. True
  23. False
  24. Lighting a match is an example of:
  25. thermal energy transformed to electrical energy
  26. chemical energy transformed to thermal energy
  27. electrical energy transformed to mechanical energy
  28. mechanical energy transformed to electrical energy
  29. What is a force? _____A PUSH OR A PULL______
  30. What is the force that pulls objects towards each other? __GRAVITY__
  31. What is a balanced force? _Equal forces acting on each other in opposite directions. Will not change the objects motion. Like tug of war where noone is winning.
  32. What is an unbalanced force? Causes an object to start moving, stop moving, or change directions. Will change an object’s motion. Like when someone is winning tug of war and pulls the opponent to the winning side.
  33. When one object is pushing or pulling another object, the first object is _EXERTING__ a force on the second object.
  34. Unbalanced forces can cause an object to do three things: 1. _Stop moving__, 2.__Start moving ___, 3. ___change direction____
  35. What is the result of the combination (draw arrows to represent which way they would go).

 +  = They add togetherand go in the same direction

+  on wheels = __They push away from each othergo in different directions.