Prof. 1
An object in motion stays in motion unless acted upon by an outside force. Like the first part of our Rube Goldberg, dose the weight of the airplane effect the speed and force of the object generated?
PROBLEM
Dose the weight of the airplane effect the speed and force of the object generated?
HYPOTHESIS
I think that the more weight of the airplane the faster it will go down the string that it is attached to.
EXPERIMENTAL DESIGN
MATERIALS
K'nechs
Tape
Airplane/toy
nails
walls
String
CV-were we put the string, if we just let it go or just push it, the angle of the string,the weight of the airplane. what airplane we use.
IV- the Walls the string is on.
DV- the airplane
EXTERNAL VARIABLES
I have eliminated my external variables by put the string for the airplane at a high enough angle with nails into the wall so its stays in the same spot and if it does come out there is holes were the nails were so we can just put it back up.
CONCLUSION
According to the graph it shows that the airplane that weighs more will go faster. I was correct in my hypothesis, I thought this because the more weight the more force applied on the airplane the faster it would go, and the more force the more gravity it had on the plane so the more it was pulling the airplane down and the faster it went down the string.
Prof. 2
How Newton's law apply to friction and gravity
Depending on the platform, can the crash car go down fast enough/ or faster.
PROBLEM
Can the crash car go down the ramp fast enough to trigger the mechanism that will release a toy train.
HYPOTHESIS
I think the higher it will go the more of a chance of triggering the mechanism.
EXPERIMENTAL DESIGN
MATERIALS
ramp
car/toy
lego
String
yo-yo
CV-how the crash car is facing on the ramp, when the car falls, what it will be hitting.
IV- the shape of the ramp and car.
DV- the car
EXTERNAL VARIABLES
I have eliminated the external variables by making a post around the string so that it will stay in the same spot and putting the flat part of the car on the flat part of the ramp.
CONCLUSION
As the graph shows the lower the better, I was wrong in my hypothesis i was thinking that if the higher the faster and it would go better. But if it went to high at an angle it might hit the ground instead of going straight. So if the car is at a not to low that is doesn't go, or to high that it hit the ground it would be best at 55 deg.
Prof.3
The relationship between speed and acceleration.
Does the amount of force the Yo-Yo have give the crash car enough acceleration to gain speed down a track.
PROBLEM
Will the yo-yo have enough force to push the car down the track and trigger a mechanism at the bottom.
HYPOTHESIS
I think that the yo-yo is at the right place on the track to generate enough force to push the car down the ramp.
EXPERIMANTAL DESIGN
MATERIALS
yo-yo
track
bouncy ball
k'nechs
stools
tape
CV-were we put the yo-yo, when we release the ball from the track,the placement of the yo-yo, and the size of the yo-yo.
IV-the track.
DV- the yo-yo.
EXTERNAL VARIABLES
I elimanated the external variables by putting the yo-yo in the track enough so that when the ball comes it falls out not before the ball comes. We also put guards rails at the end of the track so that the bouncy ball doesn't fall of the track, and there is a k'nech that the string of the yo-yo stays on so the the whole yo-yo doesnt fly off the track.
Conclusion
Like the graph shows the weight above .25 is good will make it and hit the car. I think its like the same theory as the airplane the heavier the more speed and force.
Prof.4
How simple machines utilize mechanical advantages to transfer energy.
How you can show this using experiments. Well depending on the force the hamster wheel generates as it spins from the string on top of it, will it have enough energy to get the ball inside to go down the track.
PROBLEM
Will the hamster wheel have enough force to get the ball inside down the track and cause the yo-yo to fall.
HYPOTHESIS
I think that the hamster wheel will have enough energy to get the ball inside to go down the track.
EXPERIMENTAL DESIGN
MATERIALS
hamster wheel
ball
track
string
k'nechs
tape
CV-when the ball drops, what the ball travels on, when the hamster wheel is triggered.
IV- the hamster wheel shape.
DV- the track.
EXTERNAL VARIABLES
I elimanated all external variables by making rails on the end of the track and rails from when the ball leaves the hamster wheel, we also put tape on the sides of the hamster wheel to prevent it from moving when being spun.
CONCLUSION
Solar Power
How solar power works, Solar power works by the sun hitting certain materials that are making the suns heat waves into electrical currents. Usually, when light hits on object the energy turns into heat, like the warmth you feel when you sit in the sun.
How its collected
Old- school technology for solar power was silicone which produces an electrical current when hit by light. Silicon can do this because the electrons in the crystal get up and move when exposed to light instead of just jiggling in place to make heat. The silicon turns a good portion of light energy into electricity, but it is expensive because big crystals are hard to grow. But now there is newer materials that are smaller and cheaper, such as copper-indium-gallium-selenide, that can be shaped into flexible films. These thin films aren't as good a the silicone. There also are solar panels that are used to generate electricity using the same principles of electronics as chemicals batteries or standard electrical outlets.
How it can help
The way that solar power helps the environment is that it uses no fossil fuels (which is a nonrenewable resource) to make energy, which would release carbon dioxide. Instead of using a nonrenewable source, we can use the biggest resource we have which is the sun.
