# Density/Buoyancy Quiz

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1. What is the formula for Density?
D = M/V
2. What is the fomula for Mass?
M = D*V
3. What is the formula for V?
V = M/D
4. What units are used for V?
ml or cm3
5. What units are used for D?
g/cm3
6. What units are used for Mass?
g
7. Are digits other than 0 always sigdig?
How many sigdig in:
967
61.4
0.52
• Yes
• 3
• 3
• 2
8. If a "0" is placed after a decimal is it a sigdig?
How many sigdig in:
4.7200
82.0
• Yes always
• 5
• 3
9. Is a "0" between 2 other sigdig significant?
How many sigdig in:
5.029
306
• Yes always
• 4
• 3
10. Are "0" used solely for spacing the decimal point sigdig?
How many sigdig in:
7000
0.00783
• Yes always as they arre only placeholders
• 1
• 3
11. What is the sigdig rounding rule for addition and subtraction of decimals?
ex. 677 + 39.2 + 6.23 =
• There may only be as many sigdig as the number that contains the LEAST number of decimals places
• ex. real answer 722.43 but ROUND to 722 because the least number of decimal places in the equation is 3
12. What is the sigdig rounding rule for multiplication and division of sigdig?
ex. 49.6000/47.40
• In multiplication and division the answer may only contain as many sigdig as the number with the LEAST amount of sigdig.
• ex. the real answer is 1.0464135 but it would be rounded to 1.046 because the least amount of sigdig that the equation has is 3
13. What is the definition of mass?
Mass is the amount of matter that an object has
14. What is the definition of volume?
• Volume is how much an object can hold
• (think of things like sand in a sandbox & H2O)
15. What is the definition of density?
• Density is how closely packed matter (mass) is in a certain space (volume).
• (Think of the D formula)
16. What happens to the density of an object when the volume remains constant (K) but the mass is changed ?
The density increase as the mass increases and decreases when the mass decreases but the volume remains constant (K)
17. What happens to the density of an object when the volume is changed while the mass remains constant?
• The density increases as the volume decreases and the density decreases as the volume increases while the mass remains constant
• D+V-M(K)
• D-V+M (K)
18. What is the water displacement method for finding the volume of an object?
Starting with a certain amount of water you drop the object to be measured in and record the new level of water then take the starting amount of water away to find the object's volume
19. What is the formula for finding volume and what units are used?
• V = L x W x H
• units3
20. If the density of an object is less than the density of water (1.00 g/cm3) it will _________?
float
21. If the density of an object is greater than the density of water (1.00 g/cm3) it will ________?
sink
22. If the density of an object is close to the density of water (1.00 g/cm3) it will________between the ______and the_____of the container?
stay suspended somewhere between the surface and the bottom of the container
23. What 3 things do you need to include when asked to "show all work"?
• formula
• set-up with units
• answer rounded to the proper number of sigdig
 Author: carrieross ID: 47698 Card Set: Density/Buoyancy Quiz Updated: 2010-11-08 00:02:40 Tags: density buyancy science physics 8th gr Folders: Description: Flashcards using N-1, N-2, HW-1, HW-2, HW-5, L-1, L-2, CP-3, CP-3A, Cp-3B, CP-4 Show Answers: