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DCA Week 18 Review

DCA Week 18 Review . Jan 14, 2013. Wind. It is a cleaner source of energy Wind needs to blow steadily enough to be a good energy source. Water is a more reliable source of energy than wind . Dammed Water. Moving water is one good source of energy.

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DCA Week 18 Review

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  1. DCA Week 18 Review Jan 14, 2013

  2. Wind • It is a cleaner source of energy • Wind needs to blow steadily enough to be a good energy source. • Water is a more reliable source of energy than wind

  3. Dammed Water • Moving water is one good source of energy. • You can’t just have moving water without it being dammed. The pressure and force is needed to create electricity.

  4. Force • Force is measured in Newton's (N) • Example: 1257 N • 2 groups of students are split up in a class, they both are given cabinets to push across the hall way. Group A pushes on the cabinets with a total force of 1987 N while Group B pushes the cabinets with a total force of 1897 N. • Which group has a greater force? Answer: Group A

  5. The following graph shows the monthly expenses a family spends on each other. Which of the following should the family do to decrease the spending each month? A) Eat out moreB) Find an apartment with less expensive rent. C) Purchase more grocery. Answer: B

  6. Potential Vs. Kinetic Energy • Potential: Stored Energy • Kinetic Energy: Energy in motion • To experiment the amount of potential energy affects the amount of kinetic energy you need elevation, for example: • Roller coasters • Ramp • Hill • Remember: Neither kinetic or potential energy can be created or destroyed.

  7. Potential & Kinetic Energy • At which point will the roller coaster have the greatest kinetic energy? X • Place the points in order showing an increase in potential energy. X, Z, Y, W

  8. Potential & Kinetic Energy on a Roller Coaster Potential is the greatest here! Kinetic is the greatest here!

  9. Unbalanced Force • The force acting on an object changes the objects motion. • A net force that changes the objects motion

  10. Gravity • The force that pulls objects toward each other • It is the invisible force that no one can see. • This explains the gravitational pull of all planets in the solar system orbiting the sun. • The gravitational pull is less than earth on the planets after earth, and is more than earth on the planets before earth. • The more mass the planet has, the stronger the gravitational force

  11. Which object will have the greatest gravitational pull? • A B C Answer: B

  12. Planets Planets in order from the sun: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto

  13. Force and Friction • The force applied on an object needs to be greater than the force of friction on an object in order for it to be moved.

  14. Gravitational force • The asteroids in our universe can be pulled out of its asteroid belt is by gravitational force of a close planet.

  15. Warm Up:The following is showing the distance traveled by a swimmer over time. What is the distance that the swimmer swam the last 2 minutes? Answer: 4 CM Because 18-14= 4 CM

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