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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 density of the object relative to water (correct)
- The size of the object
- The shape of the object
- The color of the object
What would happen to the boats in the park if you placed objects in them?
What would happen to the boats in the park if you placed objects in them?
- They would become lighter and easier to move
- They would become heavier and harder to move (correct)
- They would move faster across the water
- They would remain unaffected
What is the purpose of gears in a machine?
What is the purpose of gears in a machine?
- To interlock with another gear to transmit motion (correct)
- To create a stable platform
- To change the direction of motion
- To amplify the force of a machine
When you interlock a large gear with a small gear, what happens?
When you interlock a large gear with a small gear, what happens?
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What would be the result of creating a double gate that opens from the left and right?
What would be the result 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, while objects more dense than water will sink.
Boats and Sails
- Parker, the park manager, wants to find a way to make four boats move across the water.
- Teresa suggests using materials to make sails.
- A possible solution to make the boats move is to create "wind".
Gears
- Gears are rotating parts of a machine with teeth that can interlock with another gear.
- The direction of gear rotation depends on the interlocking gears.
- When a large gear interlocks with a small gear, the small gear will turn faster.
- When two gears of the same size interlock, they will turn at the same speed.
Gate Mechanism
- A double gate can be created to open from both the left and right sides.
- This is achieved by interlocking gears to facilitate the simultaneous opening of both sides.
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