Giant Waves/Tsunami
A tsunami is a series of ocean waves that sends surges of water, sometimes reaching heights of over 100 feet (30.5 meters), onto land. These walls of water can cause widespread destruction when they crash ashore.The tidal wave starts at the back of the forest and works its way toward the beach, meaning that if you are unable to run to another sector, you’re definitely going to drown. The wave is just too wide and too powerful to survive. Even if you happen to outrun it, you wind up running into more water.

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Costume with Fire
The costumes do not use real fires. According to the 'The Hunger Games' novel the flame effect was so startling and so unexpected that one would assume it was not produced with flapping, lit silk. This would not be feasible in a costume anyway. To make realistic fire one needs moving flames and light. Silk or tissue paper can certainly fill the role of flames, but for a fiery effect they need to be in constant motion. This would mean installing fans of some sort in the costume. 1:04:20 Archery "When an arrow is released, it produces a great kinetic energy that causes the arrow to bend right, then left, then right, then left again etc. until it hits the target. First, when the arrow is released, the string moves to the left causing the arrow to bend to the right, than the string moves back to the right, (center of the bow), causing the arrow to bend left. This is done even before the arrow passes the bow riser. As the arrow moves ahead, this left right pattern continues a little less each time until it hits the target. If you're a left hand shooter, the opposite pattern happens. In its most basic form, archery skills use the conversion of energy. The all-important components of trajectory and velocity can actually be expressed in mathematical formulas.
2:09:20 The Lightning It is in the section of the Arena which endures a lightning storm within its hour. The lightning tree introduces (naturally, without raising the suspicions of anyone else) the element of controlled, predictable burst of electricity in a pre-designated location, which obviously is of benefit to Beetee. Furthermore, it is a clear and concise way for the tributes to keep track of what time it is, even if they aren't anywhere near the section that is enduring it's 'hour'. It's the equivalent of Big Ben striking 12.
1:02:40
Force field Are invisible electric fields set up by the Capitol that are used to prevent tributes from escaping the arena and any other places so they won't run away from the Games. It tosses anything that hits it back to where it was before, so tributes couldn't commit suicide by jumping off the roof of the Training Center. It was also used to protect Gamemakers from tribute attacks.

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The Clock Arena
The arena is a perfect circle divided into twelve sections. Every hour, a certain disaster of sorts occurs in one of the programmed areas. For example, when the clock strikes midnight, lightning will surge through one of the areas of the arena. The cornucopia is in the middle of this arena, this clock, with the tail end of it pointing towards the section with the lightning - twelve o'clock.

1:57:55 Beetee’s Wire Beetee comes up with a plan to kill off the remaining Careers, Brutus and Enobaria. He planned on using the lightning tree and his coil to shock them both to death after Katniss's alliance fled the beach. The coil serve as the conductor. It allows the electric current flows. He got electronic supplies from the Carnucopia.
1:14:26 A wedding Dress transformed into a mockingjay Cinna the stylit of Katniss designed a dress made of black unitards that glow like embers from burning coal. When Katniss first puts it on, it is described as "heavy." Cinna informs her he did something special with the dress and to spin during the interview. During the interview, her wedding dress transforms into the plumage of a mockingjay. When she spins around with her arms raised, she is surrounded by smoke.

Electromagnetic force When Katniss attaches the remaining wire to an arrow. Finnick warns Katniss not to do it, but she shoots at the force field just as the lightning strike occurs, blowing up the tree with hundreds of sparks, and shutting down the forcefield around the arena. This electrocutes Katniss, and causes a power outage in the control room.

How to make fire? There are two components to burning wood fire: the chemical reactions in the wood itself- you see this as “hot coals”, and the flames that leap above the burning wood. Oxygen in the air combines with the starches, sugars, and cellulose and proteins in the wood to make carbon dioxide, water vapor, anda variety of other compounds, depending on what the original wood was made of.