Mar. 5
By the end of this lesson each student should be able to...
• Describe difference between force and pressure
• Discuss affect of air pressure on objects including concept of balanced forces
• Describe pressure as a "pushing" quality - not a pulling quality
• Introduction to concept of vacuum (though not named in class today)
Bell Ringer:
None today :(
Lesson:
1) Collect "Dentist Chair" specification sheet from students.
2) Return "Squeeze Play" lab to students. Comment on
• use of units
• writing pressure units as clear numerator and denominator (vertical) not horizontal for easier student work
• Reading question and identifying required terms in question (ex. #5 requires student to discuss thickness and pressure - without both of those ideas you cannot get credit for the answer.
• In #6, many students discussed "different forces" but the force was the same in all of these examples ...
• Students occasionally interchanged terms: pressure and force
3) Briefly overview "Ocean of Air" lab and distribute to students. Change instructions for #2 - instead of lift card on canning ring, lift on pair of pencils or pens.
4) In closing, discuss question #1, b. Make sure students leave with understanding of unbalanced force (pressure only on one surface) and balanced force (pressure pushing up and pushing down).
Assignment:
Students complete their "Ocean of Air" lab in class. Keep lab, do not hand in to Mr. Reimer. No homework.
