If you are on the coast and the moon is directly overhead, you should experience a high tide. If the moon is directly overhead on the opposite side of the planet, you should also experience a high tide. During the day, the Earth rotates 180 degrees in 12 hours. The moon, meanwhile, rotates 6 degrees around the earth in 12 hours.
http://science.howstuffworks.com/environmental/earth/geophysics/tide-cause.htm
In this animated interactive, see how the motion of the Earth creates inertial forces that combine with the gravity of the moon and sun to produce ocean tides on our planet. Launch Interactive. Explore how the relative motion of the Earth, moon, and sun combine to produce ocean tides.
http://www.pbs.org/wgbh/nova/earth/what-causes-the-tides.html
Lots More Information. The following diagram shows how the moon causes tides on Earth: In this diagram, you can see that the moon's gravitational force pulls on water in the oceans so that there are  bulges  in the ocean on both sides of the planet. The moon pulls water toward it, and this causes the bulge toward the moon. The bulge on the side of the Earth opposite the moon is caused by the moon  pulling the Earth away  from the water on that side.
http://science.howstuffworks.com/environmental/earth/geophysics/tide-cause.htm
About a billion years ago, it took the moon only 20 days to orbit the Earth. The moon’s gravitational pull, which is much stronger than the sun’s gravitational pull causes ocean levels (tides) to rise and fall twice each day. The moon is a very different place than the Earth. Its gravity is only about 17 percent of Earth’s gravity. A 100 pound Earthling would weigh a mere 17 pounds on the Moon. Temperatures on the moon vary from highs of nearly 265 degrees F to lows of about 170 degrees F.
http://mrnussbaum.com/space/aboutmoon/
Tides are great bulges of water caused by the gravity of the Moon and Sun. Attracted by gravity, these bulges move around the Earth’s oceans, causing water levels to rise and fall. Typically water will rise for about six hours, followed by six hours of falling water depths.
http://www.kidsgeo.com/geography-for-kids/0146-ocean-tides.php
Tune in as Josh demystifies the rise and fall of the sea. Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to explore-and explain-the everyday science in the world around us on BrainStuff.
http://www.youtube.com/watch?v=5ohDG7RqQ9I
But the gravitational force exceeds it and the water is pulled toward the moon, causing a bulge of water on the near side toward the moon (Ross, D.A., 1995). On the opposite side of the Earth, or the far side, the gravitational attraction of the moon is less because it is farther away. Here, inertia exceeds the gravitational force, and the water tries to keep going in a straight line, moving away from the Earth, also forming a bulge (Ross, D.A., 1995).
http://oceanservice.noaa.gov/education/kits/tides/tides03_gravity.html
by Gretchen Noyes-Hull. In most places, the oceans rise and fall every 12 hours and 26 minutes. These two daily “high tides” are caused by the gravity of the Moon, and also to a lesser degree by that of the Sun. One of the two high tides is usually greater than the other. Here's why.
http://www.eduplace.com/kids/hmxs/g6/explorespace/cricket/sect3cc.shtml
So the reason for the difference in the two high tide heights is that the force of gravity gets weaker the farther away a point on the Earth is from the Moon (the inverse square law of gravity). Since the Earth rotates once on its axis every 24 hours, its surface passes through these two bulges, or high tides, each day.
http://www.eduplace.com/kids/hmxs/g6/explorespace/cricket/sect3cc.shtml
Gravity, Inertia, and the Two Bulges. Two tidal bulges are created on opposite sides of the Earth due to the moon's gravitational force and inertias counterbalance. Click the image for a larger view. Gravity is a major force responsible for creating tides. Inertia, acts to counterbalance gravity. It is the tendency of moving objects to continue moving in a straight line. Together, gravity and inertia are responsible for the creation of two major tidal bulges on the Earth (Ross, D.A., 1995).
http://oceanservice.noaa.gov/education/kits/tides/tides03_gravity.html
what causes tides on earth for kids
The moon’s gravitational pull, which is much stronger than the sun’s gravitational pull causes ocean levels or tides to rise and fall twice each day.