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Tom Sawyer Day: Raft Building

Tom Sawyer Day: Raft Building. What makes rafts work?. Remember FORCE ? A force is a push or a pull A river flows because of the force of gravity on the water (current) When a raft is placed in the water, it is “pushed” by the force of the river. What makes rafts work?.

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Tom Sawyer Day: Raft Building

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  1. Tom Sawyer Day:Raft Building

  2. What makes rafts work? • Remember FORCE? • A force is a push or a pull • A river flows because of the force of gravity on the water (current) • When a raft is placed in the water, it is “pushed” by the force of the river

  3. What makes rafts work? • Keep FRICTION in mind • Friction is a force that resists motion between two objects in contact (fluid friction) • Think about what you can do to minimize friction between your raft and the water

  4. What makes rafts work? • One last thing to think about…WIND is a force, too • Sails or other structures might help your raft harness this extra force source and move faster!

  5. Fan line

  6. Previous Winner

  7. Raft Building Supplies • 5 Styrofoam cups • 2 pencils or dowels • 2 bamboo skewers • 3 sheets of construction paper • Masking tape • Glue sticks

  8. Raft Building Supplies • Get all supplies at once • Do not have to use all supplies • May break or alter supplies • None will be replaced • None can be brought from home • Planning is essential

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