Examining Density's Impact on Projectile Motion

In summary: It is an object that follows a curve that is similar to the shape of a female breast. The amount of departure from parabolic depends on the ratio of air density to projectile density and the drag coefficient. The rocket's acceleration during the burn phase and its deceleration due to gravity after the burn affects its motion. The rocket's design may also play a role in its non-parabolic path to prevent it from becoming a dangerous projectile. Additionally, the drag is directly proportional to velocity and mass does not have a significant impact on it.
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apiche
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I'm still new to the field of physics and have undertaken a project in furthering my understanding of projectile motion. Can density affect the parabolic shape of a projectile especially concerning the tail end of its motion?
 
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  • #2
Density of the medium it's traveling in or density of the object? Density of the medium would definately affect it. This is called drag and it's why skydivers reach a terminal velocity. The center of gravity of an object follows normal projectile motion no matter what spin the object has. I have no idea what you mean by the tail end of it's motion.
 
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Let me clarify. When launching bottle rockets, I've noticed that they typically start off strong and then have the tendency to "fizzle out" and almost float down to the ground instead of following a more parabolic motion. Does the density of the actual rocket affect that motion?
 
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You are quite right. A projectile follows a curve that is sort of like the shape of a female breast. (I forget the technical name.) The amount of departure from parabolic depends upon the ratio of air density to projectile density. It also depends upon drag coefficient.
 
  • #5
As the bottle rocket is in it's burn phase it's accelerating. As soon as the burn is over it slows down due to gravity. The reason why the bottle rocket doesn't follow a parabolic path on the way down is because it's pretty much an empty carboard tube and has major drag. If you were on the moon it would follow a parabolic path after the burn phase. I'm willing to bet if you fix some weights on the rocket it would follow that path as well. It was probably desiged like that anyway so rockets don't come back as deadly projectiles.


edit: forgot to say that the drag is directly proportional to the velocity and has mothing to do with the mass. so objects with more mass are unaffected by the miniscule drag where as less massive objects are greatly affected by it.
 
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apiche said:
Let me clarify. When launching bottle rockets, I've noticed that they typically start off strong and then have the tendency to "fizzle out" and almost float down to the ground instead of following a more parabolic motion. Does the density of the actual rocket affect that motion?

A bottle rocket is not a projectile.
 

FAQ: Examining Density's Impact on Projectile Motion

What is density and how is it measured?

Density is a measure of how much mass is contained in a given volume of a substance. It is calculated by dividing the mass of an object by its volume. The unit for density is typically grams per cubic centimeter (g/cm3) for solids and liquids, and grams per liter (g/L) for gases.

How does density affect the motion of a projectile?

Density can affect the motion of a projectile in several ways. A more dense object will have a greater mass, which means it will require more force to accelerate it. This can impact the distance and speed at which a projectile travels. Additionally, the density of the medium through which the projectile travels can also affect its motion, as denser mediums can provide more resistance and slow down the projectile.

What is the relationship between density and gravity in projectile motion?

Density and gravity are both factors that can influence the motion of a projectile. The density of an object can affect its mass and therefore its gravitational force. In addition, the density of the medium through which the projectile travels can also impact the force of gravity acting on the object. For example, a projectile will experience less gravitational force when traveling through a less dense medium like air compared to a more dense medium like water.

How is projectile motion affected by air resistance?

Air resistance, also known as drag, is a force that opposes the motion of an object through air. It is affected by the density of the air, the shape and size of the object, and the speed at which it is moving. In the case of projectile motion, air resistance can slow down the projectile and change its trajectory, making it more difficult to accurately predict its path.

How can density and projectile motion be applied in real-life situations?

Understanding density and projectile motion can be applied in many real-life situations, such as designing projectiles for sports or understanding the motion of objects in space. Density is also important in determining the buoyancy of objects in water, and can be used in industries such as construction and engineering to determine the strength and stability of structures. Projectile motion is also used in fields such as ballistics and aerospace engineering to design and predict the trajectory of projectiles.

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