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Questions and Answers
What determines whether an object will float or sink in water?
What determines whether an object will float or sink in water?
- The shape of the object
- The size of the object
- The density of the object compared to water (correct)
- The color of the object
What is the purpose of gears in a machine?
What is the purpose of gears in a machine?
- To increase the speed of motion
- To connect two rotating parts together (correct)
- To decrease the force required for motion
- To change the direction of motion
What would happen if you interlock a large gear with a small gear?
What would happen if you interlock a large gear with a small gear?
- The large gear would turn faster
- The small gear would turn faster (correct)
- The large gear would turn in the opposite direction
- The machine would stop working
What is needed to make the boats move across the water?
What is needed to make the boats move across the water?
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What would happen if you place objects in the boat?
What would happen if you place objects in the boat?
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What is the purpose of creating a double gate that opens from the left and right?
What is the purpose of creating a double gate that opens from the left and right?
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Study Notes
Density and Buoyancy
- Density refers to how close together the molecules of an object are.
- Objects less dense than water will float.
- Objects more dense than water will sink.
Sailing and Wind
- To make boats move across the water, materials are needed to create sails.
- The concept of "wind" needs to be replicated to test the sail's effectiveness.
Gears and Mechanisms
- Gears are rotating parts of a machine with teeth that can interlock with another gear.
- When a large gear is interlocked with a small gear, the smaller gear turns faster.
- When two gears of the same size are interlocked, they turn at the same speed.
- Gears can be used to create mechanisms, such as a double gate that opens from both sides.
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Description
Parker, the park manager, needs help making boats move across the water. Learn about density and buoyancy to solve this stem challenge.
