Grade 7 Structures projects Due Date

Hello everyone,

The grade 7 classes are building structures using the hand tools and jinx wood. Their structures and their design plans are due:

MARCH 6TH, 2014.

Thank you,

Mr. D

Answers to the Fluids review questions

Name: _________________________

Fluid characteristics and Flow Rate Review Questions

1.  What are fluids? Give three examples of fluids.

Fluids are: substances that can flow, they have no definite shape and they can be both gases and liquids. Their particles are must more spread out than a solid. They take the shape of their container. Examples: Water, oil, air.

2.  Solids cannot flow. Explain using the particle theory why this statement is true.

Particles in a solid are too tightly packed together; therefore, there is very little space between them which does not allow them to flow. They do not take the shape of their container.

3.  What is flow rate? How might the flow rate of a fluid be affected?

Flow rate: Measures the volume of fluid moving past a certain point in a given amount of time.

Flow rate can be affected by:

}  Type of fluid (thin fluids flow faster than thick ones)

}  The force pushing the fluid (stronger the force = faster the fluid)

}  Size of the opening the fluid flows through (larger opening = faster flow)

}  Type of surface the fluid is flowing on (smooth surfaces = faster flow)

4.  Squeezing a mustard container results in 60ml of mustard coming out in 5 seconds. Calculate the flow rate of the mustard. Show all your work.

60/5 = 12 Therefore the flow rate is 12ml/s

5.  How might viscosity affect a fluid’s flow rate?

By increasing the viscosity or “thickness” of a fluid, it slows down the flow rate because the particles are closer together and therefore unable to flow as easily. Viscosity increases a resistance to flow.

6.  How might warming a substance with high viscosity, such as honey, increase the flow rate? Use the particle theory to help explain your answer.

By warming a substance, such as honey, it allows for the particles to create more space between themselves and “thins” out the fluid. This process allows the fluids to flow at a faster rate.

  

7.  Pouring honey into a container results in 560 ml of honey coming out in 35 seconds. Calculate the flow rate of the honey. Show all of your work.

560/35 = 16

Therefore the flow rate of honey is 16ml/s

8.  What are the differences between laminar flow and turbulent flow? Provide examples for each.

Laminar Flow – Smooth and regular (water flowing from the tap)

Turbulent Flow – Choppy and irregular (waves in an ocean)

9.  How might a change in temperature (e.g., from warm to cold or from cold to warm) affect the flow rate of a fluid? Explain using the particle theory.

Increasing the temperature allows for the particles to spread apart and reduce the viscosity (therefore, decreasing the resistance of flow)

Decreasing the temperature allows for the particles to grow closer together increasing the viscosity (therefore, increasing the resistance to flow)

10.            Why are fluids considered “essential to life”? Justify your answer.

Fluids are essential to life because we require them in order to perform the functions of our bodies. Without fluids we cannot breathe, blood cannot flow and our cells, tissues and organs would not be able to function.

Grade 7 Structures Test dates and Info

Hello everyone,

The grade both grade 7 classes will have their Structures test next week.

The dates are as follows:

7E - Tuesday December 10th, 2013

7F - Wednesday December 11th, 2013

The test will be on the following topics:

1. 4 classifications of structures
2. Internal vs external forces (know examples and definitions of them)
3. Dynamic load, static load and total load (definitions and examples)
4. Structural components (e.g., beams, arches, trusses) and structural shapes (e.g., triangles and rectangles)
5. Designing for safety (sensors)
6. Structural stress and structural failure

I will be available after school from 3:30 - 4:30 for help if needed this week on Wednesday and Friday. I will also be available after school next Monday before the test.

Thank you,

Mr. D

Grade 8 English goal setting

Hello everyone,

Sorry for the delay. There seemed to be an issue with the post application of the blog. It has since been corrected.

Grade 8 English, please post your goals to this website. Remember to answer the question at the top of the website.

Here is the website:

http://padlet.com/wall/nonjrjr0i

This is due Friday November 1st. If you have any questions, please ask me tomorrow at morning recess.

Thanks,

Mr. D

Grade 7 brainstorming exercise

Hello grade 7 students,

Please go to this website and post your thoughts on the subject provided. Please answer this question.

http://padlet.com/wall/h5gn6la0dq

"What do you think are some ways that structures withstand both internal and external forces?" Please include only your first name and room number.

Thank you,

Mr. D

Grade 8 Organ System disease brochure due date

Hello everyone,

The grade 8 Organ System and disease project is due October 30th, 2013.

Thanks,

Mr. D

Grade 7 model ecosystem projects

Hello everyone,

The grade 7 model ecosystem projects are due October 25th, 2013. 

Thank you,

Mr. D