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The density of water is about one gram / cc. We will probably agree that if I throw something into water that is less dense than water, such as something made of most woods, it will float. If on the other hand I throw something in made of a material like iron, which is more dense that water, it will sink.
Now, for simplicity, let's consider cross sections of things we might put in water. If I throw a wooden Baseball bat in water it will float and its cross section will be circular. If I throw a closed book on the surface of water (and it stays closed) its cross section will be more or less rectangular. I hope this is clear.
Now suppose I consider a tin can. It's made mostly of iron (is spite of the name) so on the basis of my experience with nails I might expect it to sink. But you and I know it will float. Take its cross-section which is something like a 'U'. If I consider this shape I see that part of it is made up of iron-and part of it is air! So the overall density of this cross-section is less than that of iron because air is so 'light'. In fact, the density of this cross section is low enough that it is lower than the density of water and it floats.
How can we apply this? The simplest way would be to examine any object of interest a slice at a time from one end of it to the other. For each slice work out its density and compare that with the density of the water that would fit in the same space.
You now have the basics.
What else can I help you with?
How does changing the shape of an object affect its mass?
Changing the shape of an object does not affect its mass. The mass of an object remains constant regardless of its shape because mass is a measure of the amount of matter present in an object. Changing the shape may affect the object's volume and density, but not its mass.
How does mass affect the shape of an object?
Mass does not directly affect the shape of an object. The shape of an object is determined by its structure and composition. However, the mass of an object does affect its weight, which can influence how the object interacts with other objects or its environment.
Why does the shape of an object not affect its velocity?
The shape of an object does not affect its velocity because velocity is determined solely by the object's speed and direction of motion. The shape of an object may affect other factors such as air resistance or aerodynamics, which can influence how quickly the object slows down or changes direction, but it does not directly affect its velocity.
Why does changing the shap of an object have no affect on the density of that object?
Changing the shape of an object does not affect its density because density is determined by the mass and volume of an object, not its shape. As long as the mass and volume of an object remain the same, its density will remain constant regardless of its shape.
A force can affect the of an object?
A force can affect the motion of an object by changing its speed, direction, or shape. It can cause the object to start moving, stop moving, or change its current state of motion.
How does changing the shape of an object affect its mass?
Changing the shape of an object does not affect its mass. The mass of an object remains constant regardless of its shape because mass is a measure of the amount of matter present in an object. Changing the shape may affect the object's volume and density, but not its mass.
How does mass affect the shape of an object?
Mass does not directly affect the shape of an object. The shape of an object is determined by its structure and composition. However, the mass of an object does affect its weight, which can influence how the object interacts with other objects or its environment.
Why does the shape of an object not affect its velocity?
The shape of an object does not affect its velocity because velocity is determined solely by the object's speed and direction of motion. The shape of an object may affect other factors such as air resistance or aerodynamics, which can influence how quickly the object slows down or changes direction, but it does not directly affect its velocity.
Why does changing the shap of an object have no affect on the density of that object?
Changing the shape of an object does not affect its density because density is determined by the mass and volume of an object, not its shape. As long as the mass and volume of an object remain the same, its density will remain constant regardless of its shape.
Does the shape affect the way an object falls?
In air, yes. In vacuum, no.
Will a shape of an object affect how fast it falling?
In air, yes. In vacuum, no.
A force can affect the of an object?
A force can affect the motion of an object by changing its speed, direction, or shape. It can cause the object to start moving, stop moving, or change its current state of motion.
Does the shape of an object affect the rate of it's fall?
In air, yes. In vacuum, no.
What 2 principal factors affect the force of air resistance on a falling object?
The shape of the object and the density of the gas that the object is falling through.
Why doesn't changing an object's shape or size affect it's density?
Density is determined by the mass of an object and its volume. Changing the shape or size of an object alters its volume but not necessarily its mass, so the density remains constant. The distribution of mass within the object may change, but overall density remains the same.
What effect does size or shape have on the density of an object?
Size does not affect density, as density is a property that only depends on the mass and volume of an object. However, shape can impact density if the shape affects the volume of the object. A more compact shape will have a higher density compared to a more spread-out shape with the same mass.
What freature of an object does not affect air resistance?
The internal composition or material of an object does not affect air resistance. Air resistance is mainly determined by an object's size, shape, and speed when moving through air.
