1. Jeopardy
Grade 8 Science

2. The shop
Buoyancy
Density
Fluids
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500

3. D = all of the above. None of the
Which has no buoyancy in air:
Water
Rock
Life vest
All of the above
D = all of the above. None of the
Items float on air!
Row 1, Col 1

4. Is buoyancy an upward or downward force?
Buoyancy is an upward
force
1,2

5. Yes the ball will be buoyant Because it is less dense
A ball with a density of 0.9 g/ml is put in a bowl of maple syrup. The syrup has a density of 2.5 g/ml. Will the ball have buoyancy?
Yes the ball will be buoyant
Because it is less dense
Than the syrup.
1,3

6. What type of buoyancy would a fish have that is’nt at the bottom of the lake and is’nt at the top of the surface?
Neutral buoyancy
1,4

7. The amount of mass per unit Packed the molecules are.
Define the term Density
The amount of mass per unit
Of volume. How tightly
Packed the molecules are.
2,1

8. What is the Math Formula to calculate Density of a substance.
Density = Mass / Volume
2,2

9. Calculate the density of a substance that has a volume of 10ml and a mass of 20g.
D = m/v
= 20g/10ml
= 2 g/ml
2,3

10. The density of a substance will Decrease. Molecules spread out
Explain what happens to the density of a substance that is heated.
The density of a substance will
Decrease. Molecules spread out
And takes up more volume. The
Mass stays the same.
2,4

11. What tool is used for the purpose of drill a hole?
The Drill Press
3,1

12. Tape the pieces together and cut
What should you do if you are cutting several pieces of wood to the same length?
Tape the pieces together and cut
Them at the same time.
3,2

13. What tool would you use to ensure that your angles are 90 degrees?
The framing square or
Combination square.
3,3

14. What is added to structures to increase the strength of all joints?
Trusses
3,4

15. Yes. It flows and fills the shape Of the container it is in.
Is air a fluid?
Yes. It flows and fills the shape
Of the container it is in.
4,1

16. What term describes the resistance of a fluid to flow?
Viscosity
4,2

17. What terms describes the attraction of a fluids molecules to other substances?
Adhesion
4,3

18. What term describes the time it take for a reaction to occur within a pneumatic system?
Lag time
4,4

19. Gravity is opposite the force Of buoyancy
What force is the opposite of Buoyancy?
Gravity is opposite the force
Of buoyancy
5,1

20. You have 1 minute to answer this question
You have 1 minute to answer this question. The water collected after a lead ball was dropped into a full 100ml beaker was 25ml. The mass of the ball is 200 grams. What is the density of the lead ball?
D = 200g/25ml
=8g/ml
5,2

21. What computer application could you use to draw an accurate and scaled sketch of a structure?
Geometer's Sketch Pad
5,3

22. The molecules of a liquid are Close together so there is very
Explain why a hydraulic system has very little lag time
The molecules of a liquid are
Close together so there is very
Little room for compression.
Therefore you get a reaction
Almost immediatly
5,4