**SCIENTIFIC TERMS FOR SAIL BOATS**

**- THE UPWARD FORCE OF A**

__BUOYANCY__FLUID

**- THE DOWNWARD FORCE OF AN**

__GRAVITY__OBJECT

**- AMOUNT OF MATTER IN AN**

__MASS__OBJECT

**- GENERAL TERM FOR THE SUBSTANCE OF**

__MATTER__WHICH PHYSICAL OBJECTS CONSIST

**- THE**

__VOLUME__AMOUNT OF SPACE MATTER TAKES UP (L X W X

H)

**- HOW MUCH MATTER CAN FIT IN A**

__DENSITY__SPECIFIC PLACE (D=M/V)

__How do sailboats stay afloat?__**Buoyancy**- The upward force of a fluid, which opposes the weight of an immersed object.

- The buoyant force comes from the pressure exerted on the object by the fluid.
- The buoyant force is present whether the object sinks or floats

**Archimedes Principle-**This principle explains the concept of buoyancy and states that in order for an object to float, it must displace an amount of water equal to its weight.

- As a sailboat's weight pushes downward and displaces water beneath it, an upward force equal to that weight holds the boat up.
- Water displacement

**Density**-

**Density**

**is how close together the molecules of a substance are or how much**

**mass**

**a substance has in a given space.**

- To displace enough water to remain afloat without becoming submerged, a boat must have an average density less than water (Density of water = 1G/ML)
- The denser the object, the deeper it will be in a fluid.
- If the object's density is greater than the density of the fluid, the object will sink.
- If the density is less than the fluid's, the object will float.
- If the fluid and the object have the same density, the object will not sink to the very bottom.

**- the total area of an object's faces and curved surfaces.**

Surface Area

Surface Area

- More surface area gives an object a better chance to displace enough water to offset its own weight