Special Tides

Tides are caused by the difference in force felt by opposite sides of the earth. That force is determined by the distance from the moon.

As you can see, side A has a smaller distance from the moon, thus giving it a larger gravitational force. Side B has a farther distance from the moon, thus giving it a smaller gravitational force.

Side A and B feel different forces to the moon. Side A's net force will be towards the moon because of its strong gravitational force. In result, side B's net force will be away from the moon. This causes the tidal bulges. *It is
                                                                                    important to remember that if it was just the pull,
                                                                                    the sun would cause the tides, not the moon.

Spring tides occur when the sun, moon and earth are all in line. This occurs during a full or new moon. Spring tides cause higher than normal high tides and lower than normal low tides.

Neap tides occur when the moon is perpendicular to the sun and earth. This occurs during a half moon. Neap tides cause not as high tides and not as low tides.



There are two high tides and two low tides each day.
Each high tide and low tide are approximately 6 hrs apart.
Each high tide is approximately 12 hrs apart.
Each low tide is approximately 12 hrs apart.

This is the tide chart for Seabrook Island, SC.
http://www.tides4fishing.com/us/south-carolina/seabrook

Currently at 7:43pm it is low tide. The beach is experiencing neap tides, because the moons are half moons, but there will be a spring tide on Sunday the 23rd because there will be a new moon.

Newton's 3rd Law and Vectors Resource

I found this video helpful, because it first reviewed Newton's 2nd Law before explaining Newton's 3rd Law, so the viewer is able to make connections between the two laws. It first stated Newton's 2nd Law, "things in motion will stay in motion unless acted upon by an outside force" and then later on stated Newton's 3rd Law, "for every action there is an equal and opposite reaction". The video also contains many examples and diagrams, which personally draws me to the video because I'm a visual learner. For example, there is a diagram with a box of a specific weight and two vectors pushing in opposite directions of an equal force of 10N so the box remains at rest. The vectors are just guidelines to know the actual direction and Fnet (total force on the object) of the object. When the video was reviewing Newton's 2nd Law, it had an example of a person that had been pushed on frictionless ice, and that person kept moving unless something or someone stopped that person. I know this video is reliable, because I compared the content of the video to my class notes and they match up.

--> To skip to Newton's 3rd Law, skip to 9:40
Newton's 3rd Law states, "for every action there is an equal and opposite reaction", but the video alters that definition to "for every action force there is an equal magnitude and opposite direction reaction". This definition is actually a little clearer to me, because it is a little bit more specific. For example, the video has a diagram where someone is pushing on a wall with 10N so the wall is pushing back on the person with 10N, because for that force there is an equal magnitude of the same force in the opposite direction. The video then proceeded to explain that the only exception would be if the person was so strong that it could push on the wall to the point where the wall couldn't push back with sufficient force, causing the wall to briery accelerate and topple over.

Newton's 2nd Law and Newton's 3rd Law relate, because the Fnet (total force on the object) will cause the equal and opposite reaction force. For example, if a box is being pushed with an Fnet in the right direction, then the box is pushing on the ground to the right and the ground is pushing on the box to the left. The only way the box could move forward would be if someone were pushing harder on the box in the right direction than the ground was pushing on the box in the left direction. I liked this video, because it helped me to see that connection between the two laws.

Newton's 2rd Law Resource

I found this resource helpful, because it is not only long and thorough but it explains the equations in a similar way to how we looked at them in class. Although equations will be the same anywhere, this particular video explained them in a way that reminded me of how Mrs. Lawrence explained them, which is what drew me to this video. For example, F = ma is formed by (a~F) and (a~1/m). I know this video is reliable, because I compared the video content with my class notes, and they match up. The video also contains example experiments, which makes use of the equations and makes them clear to the viewer. One of the experiments in this video exemplified how to solve for force (F = ma) as well as for acceleration (a = F/m). The experiment showed how the velocity was increasing, because the distance in between the time intervals were getting longer each time. I am a visual learner, so I personally learn faster from experiments and diagrams, which is another reason why I enjoyed this video. I watched many other videos before choosing this one, but the other videos didn’t quite cover the material like this video did. An approach the video took that I had not seen before was defining force as the "rate of change of momentum". That definition actually made a lot of sense to me, so during this video I reviewed Newton's 2nd Law as well learning something new about it. One thing I would change about this video was that it didn't explicitly state Newton's 2nd Law in word form. The video stated the law with equations and made the equations very clear, but failed to state how the equations relate to the law as a whole. For example, in class we wrote (F =ma) as
force = (mass) (acceleration). For someone who was just learning about Newton's 2nd Law, that would have been a nice explanation to add to the video.