Why%20is%20it%20hard%20work%20to%20walk%20through%20water?

1
Why is it hard work to walk through water?
2
Why are fish the shape they are?
3
Why are boats and ships the shape they are?
4
The man is pulling the oar to push the boat
forwards.
The boat is moving forwards in this direction.
The water feels as if it is pushing you back.
This is water resistance.
5
What would happen if I dropped a ball of Blu-tac
into these three containers?
Empty
Water
Wallpaper Paste
6
I want to create a fair test using this equipment
to find out if the shape of the blu-tac makes a
difference to the speed at which it falls through
the water.
Container of water
Clock or timer
Blu-tac or plasticine
7
Fair Test
What we are going to find out
What we are going to measure
What we are going to change
What we are going to keep the same
8
Which shape was the slowest?
Which shape was the fastest?
How does the shape make a difference to the
speed of the fall?
WHY?