1. What is the volume of a cylinder that has a radius of 3 cm and a height of 10 cm? Volume = πr 2 x h V= 3.14x (3cm x 3cm) x10cm V=282.6 cm 3 3cm x 3cm = 9cm 2 9.0cm 2 X 3.14 28.26 cm 2 x 10 cm 282.6cm 3 r= 3cm h= 10cm

2. Aim – Why do things float or Sink?

3. Buoyancy Buoyancy is the force in a liquid or gas that pushes upwards. The opposite of gravity! Buoyancy Gravity A Nun Buoy

4. Matter can have Positive buoyancy - it floats Negative buoyancy – it sinks Neutral buoyancy – it “Flinks”

5. Positive Buoyancy The force of buoyancy is greater than the force of gravity!

6. Negative Buoyancy The force of gravity is greater than the force of buoyancy!

7. Neutral Buoyancy The force of gravity is equal to the force of buoyancy!

8. Fluids with Different Densities (fluids include liquids and gases) 1.0 g/cm 3 13.5 g/cm 3 0.00018 g/cm 3

9. Sink or float in Water (1.0 g/cm 3 )? 1.Silver……………………….10.40 g/cm 3 2.Douglass fir……………….0.56 g/cm 3 3.Submarine ………………. 1.0 g/cm 3

10. Sink or float in Water ? 1.Salt………………………….2.200 g/cm 3 2.Maple………………………0.69 g/cm 3 3.Ebony……………………..1.20 g/cm 3 4.ZBT ………………………….1.00000009 g/cm 3 5.XBT …………………………0.99999999 g/cm 3

11. Sink or float in Gasoline (0.72 g/cm 3 )? 6. Balsa………………………0.12 g/cm 3 7. Maple………………………0.69 g/cm 3 8. Ebony……………………..1.20 g/cm 3 9. White Pine…………………0.43 g/cm 3 10. ABT …………………………0.72 g/cm 3

12. A sphere has a volume of 38.2 cm3. If it flinks in water, what is its mass?