Laboratory work

Содержание и основные понятия

Back to the table of contents
Alterna · physics · 3.L
Laboratory work
Laboratory No. 8-9: Archimedes power, body swimming
Two virtual lab workes: measuring the push force with a dynamometer and checking the conditions of body navigation. Test directly in the browser.
GEF · Grade 7
PIF · Baseline
01
Laboratory work No.8: Clarification of the force pushing
Objective: To detect and measure archimedes power.
Proceedings
Hang the body to the dynamometer, record the weight in air P
1
Put the body in the liquid without touching the bottom, record statement P
2
Archimedic strength: F
A
= P
1
− P
2
Repeat for liquids of different density (water, salt solution, oil)
Make sure: F
A
= ρ
cf
·g·V
⚙
Virtual Dynamometer — Archimedes Force
IV-031L8 · measurement F_A = P1 - P2 for different liquids
Body:
Liquid:
Conclusion
Archimedic strength depends on the density of the liquid and the volume of the drowned part of the body, but does not depend on the depth of diving (if the body is completely in water).
A
= ρ
cf
·g·V.
02
Laboratory work No.9 Conditions of navigation of the body
Objective: To verify the conditions of navigation of the bodies.
Proceedings
Prepare bodies of different density: cork, wood, paraffin, aluminium, steel
♪ I'm gonna drop it in the water, watch the behavior ♪
Write: drown / swim on the surface / swim inside
Compare
Body
c/
Water
= 1000 kg/m3
Check the rule:
t
< ρ
cf
♪ Swimming ♪
t
> ρ
cf
♪ drowning
🍃
Virtual Basin — Navigational Conditions
IV-031L9 · Selection of material · Navigation/inclusion observation
Body material:
Conclusion
The body swims if the density is less than the density of the liquid. The body drowns if the body is larger. Equality — The body hangs in the thicker.