Density and Buoyancy in Water

Density

• Density refers to how close together the molecules of an object are.
• Objects that are less dense than water will float.
• Objects that are more dense than water will sink.

Sailing Boats

• Parker, the park manager, wants to find a way to make four boats move across the water.
• Teresa suggests using materials to make sails.
• The concept of "wind" is needed to make the boats move.

Objects in Boats

• Placing objects in a boat will affect its movement.

Gears

• Gears are rotating parts of a machine with teeth that can interlock with another gear.
• The direction of gear rotation depends on the interlocked gears.
• When a large gear is interlocked with a small gear, the large gear turns slowly and the small gear turns quickly.
• When two gears of the same size are interlocked, they turn at the same speed.

Gates

• A double gate can be created to open from both the left and right sides.