1. Monday, March 20th Entry Task No new entry task brochure today.
Schedule:
12.1 & 12.2 Quiz
Pressure notes
Objective:
I can describe how pressure depends on force and area
Homework:
12.3 RSG
Please have on desk:
ISN open to Friction graphic organizer and activity
Last week’s entry tasks

2. Pressure depends on area
The amount of pressure we feel depends on how much force is applied over how much area
P = F/A

3. Pressure acts in all fluids
Liquids and gases exert pressure in all directions on the things around them.
Why don’t we notice that the air around us is pressing on us?
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4. Pressure acts in all fluids
For every action force, there is an equal and opposite reaction force.
Air pushes on us, we push on air with an equal, but opposite force. (Newton was brilliant!)

5. Pressure acts in all fluids
Ears hurt when pressure outside is greater than pressure inside.
Ears hurt when pressure inside is greater than pressure outside
1/28/2018
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6. Pressure acts in all fluids
Air Pressure decreases as you climb higher in the atmosphere
As you climb less air is above you. Less Force = Less Pressure

7. Pressure acts in all fluids
Water Pressure increases as you dive deeper
More water is above you, so it exerts a greater Force on a given Area.
More Force = More Pressure

8. What is the purpose of wearing snow shoes?

9. Possible Answer
The lady wants to spread her force out over a larger area of the snow so she stays on top of it. If she did not have snowshoes, she might “sink” into the snow. If her force is spread out, there is not enough pressure on any one spot to “sink” .

10. Why doesn’t the person on the bed of nails get pierced by them?

11. Possible answer
The force of the nails on the person’s body is spread out over the area of his entire body. No one nail has enough pressure to pierce the skin.

12. Tuesday, March 21st
Entry Task Explain why your ears hurt when you dive deep into a swimming pool.
Schedule:
Bill Nye Pressure
Pressure Math
Objective: I can calculate pressure, force, or area when provided 2 of the quantities using the formula P = F/A
Homework:
Complete the pressure math worksheet

13. Wednesday, March 22nd
Entry Task A box with weight of 25 N is placed on a brick with an area of 0.12 m2. How much pressure does the box exert on the brick?
Schedule:
12.3 quiz
Gravity, friction, and pressure review
Objective: I will review 12.1, 12.2, and 12.3
Homework:
Finish review if not completed in class
Please have on desk:
ISN open to pressure math worksheet

14. Thursday, March 23rd
Entry Task Draw a picture of a balloon and draw arrows to show the pressure on it.
Schedule:
Buoyancy notes
Objective: I can explain how fluids exert forces
Homework:
Output page (questions 1-6, page 407) IQIA!!!
What happens when you don’t understand buoyancy?
Please have on desk:
ISN open to yesterday’s review

15. Fluids exert an upward force on objects
Fluids (liquids and gases) push in all direction on things in them…including pushing them up.
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16. Fluids exert an upward force on objects
The upward force of fluids is called Buoyant Force
Gravity and Buoyant Force oppose each other

17. Fluids exert an upward force on objects
If gravity is much stronger than buoyant force, the object will _________.
If buoyant force is much stronger than gravity the object will __________
If the 2 forces are equal, the object will ___________________________.
sink
float
Neither sink nor float, but stay in one spot

19. Fluids exert an upward force on objects
Density and buoyant force are related.
The more dense the fluid, the greater buoyant force it has.
Salt water is more dense than fresh water
More dense = more buoyant force = easier to float

20. Fluids exert an upward force on objects
Density and buoyant force are related.
The more dense the object in the fluid, the less buoyant force affects it.
More dense stuff sinks, less dense stuff floats

21. Air has buoyant force too
Air has buoyant force too. The buoyant force of colder, more dense air is able to push the warmer, less dense air in the balloon upwards.

22. Fluids exert an upward force on objects
Buoyant force changes weight
Buoyant force opposes gravity so the object will weigh less with additional buoyant force
Astronauts train in water to get used working in space

23. Buoyancy and The Titanic
The 2 forces that are balanced in floating ships are Gravity and Buoyant force.
The overall density of the Titanic was less than the density of water because it was filled with air.
After it hit the iceberg, the density of the Titanic increased because the air compartments in the front of the ship filled with water.

24. To summarize: buoyant force
is the upward force on objects in a fluid
is why ice floats in water
is why objects seem lighter in water
buoyant forces on an object are equal to the weight of the water that is displaced by the object
if an object is more dense than the fluid then it will sink.
if an object is less dense than the fluid then it will float.

25. Motion of fluid affects pressure
Bernoulli’s principle
An increase in the speed of the motion of a fluid decreases the pressure within the fluid
The faster a fluid moves, the less pressure it exerts on the surfaces of openings it flows over.
Chimney, air plane, race car and prairie dog examples

26. Forces transmitted through fluids
Pascal’s Principle
When an outside pressure is applied at any point to a fluid in a container, that pressure is transmitted throughout the fluid with equal strength.
Examples: pressing on a tube of toothpaste, hydraulics

27. Friday, March 24th Schedule: Buoyancy activity Objective:
Entry Task
Why does toothpaste come out of the tube when you squeeze it?
Schedule:
Buoyancy activity
Objective:
I will obtain and graph buoyancy data for different objects and fluids
Homework
Complete buoyancy activity
Please have on desk:
Journal open to buoyancy notes