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Activity

Water wheel to lift a weight

Summary: 
Make a wheel that can be turned by water to raise a marble.
Science content (2016 curriculum): 
Biology: First People’s sustainable use of Living Things (K, 2, 3)
Chemistry: First People’s Materials/Separation methods (1, 6)
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)
Physics: Simple and complex Machines (5)
Materials: 
  • tray
  • 2 supports for rod e.g. U-shaped foam
  • masking tape
  • pie plate
  • pencil to punch hole in pie plate
  • wooden rod ~3/8” diameter, or straightened metal coat hanger
  • scissors
  • string, length of table height
  • small pot
  • masking tape
  • marbles
  • large jug for water
  • large funnel
  • cloths and mop for spills
  • sink
Procedure: 

You have a challenge to lift a marble from the floor to the table top, without picking it up with your hands. You can only pour water, and the weight of the water will lift the marble. This activity uses a wheel.

Set up (please take care with cut aluminium plates - the edges are very sharp):
Tape U-shaped pieces of foam to the centre of the long sides of the tub.
Fold a pie pan twice to find the centre, then punch a hole through with a pencil. Push a rod through the centre hole, then tape firmly to the pie pan with duct tape.
Make cuts from the edge of the pie pan to within a pinky length of the centre in four places. Fold over the sides of each section to make a paddle wheel shape.
Lay the wheel and axle (rod) over the foam supports on the tray. Test that it can turn without hitting the bottom of the tray. If necessary, fold over the outside edges of the pie plate - or alternatively, cut a smaller circle out of the pie pan to start with.
Make sure one end of the rod protrudes over the edge of the tray more, then tape the string to this end of the rod. Cut the string off where it meets the floor, and use masking tape to secure a small pot to the end of the string. Add a marble to the cup.

Students pour water onto the wheel to turn it, wrap the string around the rod, and raise the marble.
The weight of the water hitting the paddle blades generates a force with makes the blades move and the wheel turn. The turning wheel turns the rod, which winds the string and pulls up the marble.
Once the blades of the wheel start dipping in the water, the tray should be emptied (may need adult help) to pour the water back into the jug using the funnel for reuse.
Students can be challenged to control how they pour the water to make the marble raise slowly or faster, or to raise more than one marble.

First Nations fish wheel uses the weight of moving water to turn a wheel with attached netting to catch salmon:
https://www.youtube.com/watch?v=oYnPr6n1tjo
https://www.youtube.com/watch?v=IarZQFsDAiM
Fish wheels are used to catch salmon during a run.

Notes: 

The cut foil is SHARP. Need to use something else for the wheel if students are going to make their own, or tape the cut edges.
Once the rod gets wet, the wheel cannot be attached to it anymore and the axle spins without turning the wheel - needs adapting also.

Try this arrangement with a bucket (and pre-made dowel support).

Grades taught: 
Gr K
Gr 2
Gr 3
Gr 4
Gr 5
Teacher: 
Brenda Koch
Fiona Laporte
Ingrid
Teaching site: 
Aboriginal Focus Elementary
Activity originally developed and delivered: 

Aboriginal Focus School with Vancouver School Board's Scientist in Residence Program.