| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
| T |
Hydraulic machines use liquid pressure to create movement. |
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Pressure in fluids is caused by the collision of particles on the surface of an object. |
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What is pressure in fluids caused by? Make Cartesian Divers |
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| D |
Make a Cartesian Diver<OL>
Cut a straw 3-4 cm long
Block one end with plastince
Make a weight belt of plasticine so that the diver just float under the surface of water</OL>
Record observations for Diver.
Explain the observations. |
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Observations:
When the bottle is squeezed the diver sinks. |
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| T |
The magnitude of the pressure in liquids is equal to the weight of water above the object. |
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What is the magnitude of the pressure in liquids equal to? |
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| W |
The pressure in liquids increases with depth. |
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What happens to the pressure in liquids when depth is increased? Draw a sketch graph of the relationship. |
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The size of the upthrust force is equal to the weight of the water displaced by the object. |
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What is the relationship between the upthrust force and the weight of the water? |
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An object will sink until enough water is displaced to produce an upthrust to balance it's weight. |
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To what point will an object sink to? |
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If the weight of the object is greater than the upthrust produced the object will sink. |
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What causes an object to sink? |
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If the weight of the object is equal to the upthrust produced the object will float. |
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What causes an object to float? |
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The density of water is 1kg/l = 1g/ml |
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What is the density of water equal to? Measure a measuring cylinder of water after taring with just the cylinder on Jewelry balances. |
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Objects which are less dense than water will displace a greater weight of water than they have. Therefore they will float. |
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What effect do objects that are less dense than water have on the water? Sample calculations. |
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Objects which are more dense than water will displace a smaller weight of water than they have. Therefore they will sink. |
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What effect do objects that are more dense than water have on water? Sample calculations.
Predict if objects will float given weights and volumes.
How much of an object will be submerged. |
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