LAB 1:
Problem: Does the number of dominoes affect the speed/acceleration of the last domino that falls off the table/stand?
Hypothesis: I believe that the more dominoes on the platform the more the speed/acceleration will increase.
CV: Surface, area done, person doing the pushing, how they are pushing it, timer, the person timing, and the length of the platform.
DV: Speed/Acceleration of the dominoes to push the last one off the platform
IV: the number of dominoes
Control: Speed/Acceleration of dominoes
Materials:
- Dominoes
- Wood
- Glue
- Timer
- Calculator
Procedure:
1. Gather ALL materials
2. Set up your platform where you are planning on doing the experiment
3. Place 6 marbles onto the platform at least 1 inch apart
4. Have the timer ready to time the last domino
5. Slightly touch the first domino
6. When the last domino falls off the end of the platform you start the timer
7. When you hear and see the domino hit the table, you stop the timer
8. Record your readings on the chart you have created
9. Repeat steps 3-8 4 more times
10. Repeat steps 2-9 4 times but with 8 dominoes
11. Repeat steps 2-9 4 times but with 10 dominoes
12. Conclude
13. Clean up
Conclusion:
After looking over the recorded date, my hypothesis was incorrect. I found out that the more dominoes you have the faster they fall because they are closer together. Now I know for next time is that they closer to something gets the faster they fall.
LAB 2:
Problem: What type of rope/string/wire makes the car in the cup on the single pulley makes the weight goes the fastest? Knitting yarn, mettle wire, or construction string.
Hypothesis: I believe that the knitting yarn is going to make the weight go the fastest because it is the most flexible out of the other options. Also it is strong so it will hold up more weight.
CV: Surface, area done, type of pulley, person timing,
DV: Gravity and weight
IV: the type/brand of string
Control: Speed of different kind of string
Materials:
- Knitting Yarn
- Bendable Wire
- Construction wire
- Wood Glue
- Plastic Cup
- Weight (20 Gram)
- Golf Ball
Procedure:
1) Gather ALL Materials
2) Cut a piece of all the different strings at 3 ½ ft. long
3) Find a place to hook the pulley, then hook it there
4) Put the cut piece of knitting yarn onto the pulley that is set up
5) Attach the 20 gram weight to the right side
6) Punch parallel holes in a small plastic cup
7) Put the left side of the string through those holes in the cup
8) Set up the ramp that is already made with the wood and glue
9) Place the dominoes on the platform ½ of an inch a part
10) Set the Golf ball and let go, when you let go start the timer
11) Wait for the last domino on the platform to fall and stop the timer
12) Repeat steps 2-11 4 more times, record data
13) Repeat steps 2-12 with mettle wire and Construction Wire
14) Clean Up Area
15) Conclude
Conclusion:
According to my hypothesis, my there was right! The Knitting Wire was the fastest out of the 3 different kinds we had tested. Also by looking at the bar graph, the least recorded times on most trails was the Knitting Wire. I believe that this happened because the mettle wire is to stiff to move thoroughly, and the construction wire it so heavy to move fast enough to swing the cup around to hit the domino!
LAB 3:
Problem: What type of surface slows a blue plastic ball down the most? Thick Carpet, 100 grit Sand paper or original Steal Wool.
Hypothesis: I believe that the steal wool is going to be the best friction factor because of how thick and rough it is. The carpet, I believe, is going to be to silky to slow the ball down enough, and the Sand paper is going to be to thin.
CV: Surface, Wood glued to, Ball, tester, timer, day
DV: Friction / Speed
IV: Carpet to steal wool to sand paper
DV: Friction / Speed
IV: Carpet to steal wool to sand paper
Control: The Friction on different surfaces
Materials:
- Glue gun
- Glue sticks
- Steal wool
- Carpet piece
- 100 grit Sand paper
- Red plastic ball
- Timer
Procedure:
1) Gather ALL Materials
2) Tear and separate the sheets of steal wool
3) Glue the torn wool onto the wood
4) Set up all the things before and after this part happens
5) Put the golf ball at the start, and let go
6) When the ball starts to roll across the friction part, start the timer
7) Stop the timer when the ball falls into the trash can
8) Record time
9) Repeat steps 3-7 4 more times
10) Repeat steps 3-8 but with the 100 grit sand paper
11) Repeat steps 3-8 but with carpet
12) Conclude
13) Clean Up
Conclusion:
Looking back at the graph, it can prove that my hypothesis was correct. What type of surface slows a blue plastic ball down the most? Thick Carpet, 100 grit Sand paper or original Steal Wool. I chose the Steak wool because it is the thickest out of the three.
LAB 4:
Problem: Does falling into a trash can or a cup stop the ball from bouncing the best?
Hypothesis: I believe that the cup will stop the ball from bouncing the best out of the 2 because if it is falling from a ledge, it has a great force of gravity pulling it down, and if it lands in the trash can, it will have more room to move around in and more bounce room. But if it falls into a small cup, it wont have as much room to bounce and move around, so therefore the cup would stop the ball from bouncing the best.
CV: area, timer, person timing, placement of the object(s), person setting it up, person starting the Rube Goldberg
DV: Gravity
IV: Trash can or a cup
Control: What stops a ball from bouncing the best
DV: Gravity
IV: Trash can or a cup
Control: What stops a ball from bouncing the best
Materials:
- Timer
- Rube Goldberg stuff
- Red Plastic Ball
- Toy Car (something with wells)
Procedure:
1) Gather ALL Materials
2) Set up the whole Rube Goldberg
3) Put a normal sized trash can at the end
4) Start the rube Goldberg
5) When the ball falls off into the trash can, count how many times it bounces
6) Repeat steps 2-5 4 more times
7) Repeat steps3-6 with the small plastic cup
8) Record data
9) Clean up
10) Conclude
Conclusion:
According to my hypothesis, and looking over the data recorded, I was correct! The trash can gave the ball more room to move around and bounce, and the cup either had less or no room to move and bounce.
