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Kora's lesson 10
Article posted January 18, 2013 at 04:35 PM GMT0 •
comment • Reads 637
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1. The light bulb sparked.
2. The more washers, the light will light more.
3. 4 washers: the light bulb was on for less than a second.
5 washers: it stayed on longer than with 4 washers.
6 washers: it was on longer and brighter.
7 washers: the light bulb was really bright for really long.
4. The more washers there are the light will be brighter and last longer.
5. The motor spinning from the washers falling.
6. 4 washers weighed 1.2 N and fell 1.7 m that's 2.04 J (N-m)
5 washers weighed 1.5 N and fell 1.7 m that's 2.55 J (N-m)
6 washers weighed 1.8 N and fell 1.7 m that's 3.06 J ( N-m)
7 washers weighed 2.0 N and fell 1.7 m that's 3.4 J (N-m)
7. The more washers there are the more work is done because adding washers is adding weight.
8. You could have a longer distance to fall.
9. Step 1 Measure the distance the washers fell (string length).
Step 2 Weigh the washers in Newtons with the spring scale.
Step 3 multiply the weight (N) by the distance (m) to get work (J)
Weight (N) x distance (m) = work (J)
10. No you couldn't charge it because the washers would have to be constantly falling.
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Article posted January 18, 2013 at 04:35 PM GMT0 •
comment • Reads 637
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Lesson 9 kora
Article posted January 10, 2013 at 04:36 PM GMT0 •
comment • Reads 446
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1. A watt is how you measure power. Work (J) divided by time (s) = power (w)
2. A 100 w light bulb uses 100 w to put out light and heat. A 100 w motor has 100 w of power to lift stuff.
3. 750 watts = 1 horsepower.
4. Yes. The more batteries the more power.
5. The motor got more powerful making it lift faster.
6. One line went up, and the other went down.
7. You could use more batteries.
8. Ya... I think. Otherwise the energy became kinetic or mechanical energy.
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Article posted January 10, 2013 at 04:36 PM GMT0 •
comment • Reads 446
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Kora's Lesson 8
Article posted December 27, 2012 at 07:16 PM GMT0 •
comment • Reads 454
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The way we think about work is sitting in a cubicle or in an office or, a more physical work like construction.
The scientific definition of work is moving an object:
Nm=N-m or J weight (N) • distance (m) = Newton-meter or Joule
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Article posted December 27, 2012 at 07:16 PM GMT0 •
comment • Reads 454
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Lesson 7 Reflection
Article posted December 13, 2012 at 04:33 PM GMT0 •
comment • Reads 1318
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When I decrease the number of wires the motor lifts more washers then with more wires. With all four wires the motor lifted an average of four washers, with three wires it lifted an average of 5 washers.
As the number of wires increases the motor won't be able to lift as many washers as when there are less wires because the more wires, the farther the electricity has to travel which means it would lose power and not all the power would get to the motor.
I was right!
For four wires, it could lift 4 on average. With two black wires and one red, it could lift five washers on average. With one black and two red, it could only lift four washers.
My thinking is in my hypothesis.
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Article posted December 13, 2012 at 04:33 PM GMT0 •
comment • Reads 1318
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Kora's Reflections
Article posted November 9, 2012 at 04:23 PM GMT0 •
comment • Reads 884
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1. I would attach the rubber band to a hook that I put on the cart and pull.
2. I would pull harder to double the force.
3. Gravity is the force that makes objects have weihgt.
4. Gravity pulls things down.
5. The more dense the object is the more gravity will pull on it.
6. Gravity is a force that pulls everything on earth down.
7. When I put more washers, the weight increased. I perdicted the weight would increase as I added washers, I was right. If you look at the data table or the line graph, you can see that the weigt increases. It's just like adding numbers, the answer will be larger than the original number.
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Article posted November 9, 2012 at 04:23 PM GMT0 •
comment • Reads 884
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What is your favorite pie?
Article posted October 9, 2012 at 04:23 PM GMT0 •
comment (8) • Reads 1683
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1. Apple pie
2. Blackberry pie
3. Blueberry pie
4. Cherry pie
5. Pumpkin pie
6. Strawberry
7. Strawberry rhubarb pie
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Article posted October 9, 2012 at 04:23 PM GMT0 •
comment (8) • Reads 1683
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7 Random facts about me
Article posted September 13, 2012 at 04:29 PM GMT0 •
comment (2) • Reads 1849
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1. I am 11 years old
2. I like the color green
3. I love the color blue
4. I like to explore the outdoors with my dog
5. My favorite dessert is brownies
6. My favorite pro sport to watch is football
7. My favorite sport to play is softball
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Article posted September 13, 2012 at 04:29 PM GMT0 •
comment (2) • Reads 1849
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About the Blogger
Energy
Energy Transformations
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