Density
Buoyancy
Properties of Water
Engineering et al.
Archimedes' Principle
100
What is density?
The amount of matter in a given space or volume.
100
What is buoyancy?
The ability of an object to float.
100
What is the density of water?
1 g/mL
100
Why is it important to prototype during the engineering process?
So flaws can be assessed and remedied.
100
How can you measure the volume of an object using water?
The amount of water displaced is equal to the volume of the object.
200
What is the formula for density?
Density = Mass / Volume
200
Explain this image:
The object is floating because the buoyant force is equal to the force of gravity, ergo no net force is acting on this object, so it is floating.
200
What is fluidity?
the ability of a substance to flow easily.
200
Why is it important to blueprint prior to building or prototyping?
To ensure that all dimensions of what you are building are already decided on and it can be accurately built.
200
According to Archimedes' principle, why would an object sink?
The mass of the object is greater than the mass of the water it displaces.
300
If you have an object with a mass of 55 grams and a volume of 15 mL, what will be its density?
3.67 g/mL
300
What causes and object to sink?
An object sinks when the downward force of gravity is greater than the upward force of buoyancy. This can happen when the object is denser than the fluid it's in.
300
What is viscosity? How does viscosity affect the ability of an object to move through it?
Viscosity is the measure of a liquid's fluidity. The more viscous a liquid, the slower an object moves through it.
300
What Design Cycle Criterion asks the developer to create blueprints for their prototypes?
Criterion B: Developing Ideas
300
What does Archimedes' principle state about floating objects?
The mass of a floating object is equal to the mass of the water it displaces.
400
If you have an object with a mass of 75 grams and a volume of 8mL, what will be its density?
Round to the nearest hundredth.
Density=9.38
400
When does an object float?
An object floats when the upward force of buoyancy is equal to the downward force of gravity. This can only happen when the object is less dense than the fluid it's in.
400
What is surface tension? How does it work?
Surface tension is the extra force of attraction between surface molecules in water. Water molecules have cohesive forces between them; at the surface, they have no molecules above them, ergo they are extra attracted to the molecules around them. This causes surface tension.
400
Provide an example of the Design Cycle being used in every day life.
Answers vary
400
Why does a metal boat float?
Even though metal is denser than water, the hollow design of a boat creates a large volume filled with air, lowering the overall density of the boat below that of water
500
If you have an object with a mass of 25 grams and a volume of 3 mL, what will be its density?
Density: 8.33
500
What is neutral buoyancy?
When an object's density is equal to the density of the liquid it is in.
500
How does viscosity impact a boats ability to float...or does it?
While not directly affecting buoyancy, viscosity can influence how smoothly a boat moves through the water. Higher viscosity creates more resistance, potentially affecting the boat's maneuverability and stability, especially when navigating shallow waters.
500
Name all four parts of the Design Cycle.
A: Inquiry and Research
B: Developing Ideas
C: Creating the Solution
D: Evaluating the Solution
500
How do boats work?
They spread mass over a larger area, displacing a greater amount of water, allowing them to float.