1. WATER RESISTANCE
By Tyieissia and Talal

2. PERFECT DIVE?
Some swimming strokes help reduce the amount of water resistance when you move through water. During front crawl, for example, your body creates a smooth thin line in the water and your arms cut through the water with very little surface area. Divers try to enter the water with the least surface area, too , so they avoid a splash and a painful belly flop!

3. HOW WATER RESISTANCE WORKS?
Water resistance is a type of friction. When we jump into a swimming pool, it is water resistance that prevents us from hitting the bottom.
Some watches are designed specially to survive the impact of water resistance when diving into water.

4. WHY IS IT HARD WORK TO WALK THROUGH WATER?
It is hard to walk through water because the water is a heavy thing to walk through. Water has greater density than air. That is, there are more molecules in a given volume of water than in the same volume of air. So when you walk in water, you have to displace more matter than walking through air.

5. WATER FORCES
We can show the forces acting on an object using a force diagram. In a force diagram, each force is shown as a force arrow. An arrow shows:
The size of the force (the longer the arrow, the bigger the force.)
The direction in which the force acts.
The arrow is usually labelled with the name of the force and its size in newtons.
Text books often show a force with a thick coloured arrow, but it is best if you just use a pencil and ruler to draw an arrow with a single line.
Balanced forces
When two forces acting on an object are equal in size but act in opposite directions, we say that they are balanced forces.

6. Nature’s design
Many sea creatures have streamlined bodies that help them to move easily through the ocean water. Sharks and fish have a slim body, with fins to help them swim easily through the water and steer. This means they use less energy to swim around. Many boats have been designed in this same way. Speedboats have a pointed front that cuts through the water and air. Sailing boats have a streamlined shape that glides through the water, but wide sails that capture the wind to power them along.