Questions tagged [projectile]

Object moving through space due to the exertion of a force.

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1answer
40 views

Coriolis force versus other effects that deflect an objects falling on earth from its vertical path

I am studying accelerating reference frames and I have solved the famous problem of finding how the Coriolis force deflects the trajectory of a falling object on Earth, the answer being $$ x_{east} = ...
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64 views

Will arrow from traditional longbow will be dangerous if it is falling from above?

Let's imagine commonly seen in movies and video games "rain of arrows". Archers shoot up to hit enemies behind the obstacles, for example. As Brittanica states: “The best longbows were made of ...
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What are the underlying concepts in the Strength regime vs Gravity regime graph in Impact cratering? [on hold]

So I am trying to write a research paper (about 3700 words) for high school about the topic in the title or something similar. I have found the following information which I am struggling to ...
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2answers
29 views

Resolve Drag into Vector Components

Assume you have a sphere travelling at a velocity of $30$m/s, at angle $30^\circ$ relative to the local horizontal plane. For the purposes of the below equations please ignore more complicated ...
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4answers
121 views

A man with a rifle shoots bullets at a speed [closed]

Hello all So I was doing this question. I had a doubt that, initially as both the (man and rifle ) system and the bullet were at rest we put 0 instead of m1u1 + m2u2 in equation of conservation of ...
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1answer
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Projectile motion problem with only angle and distance given [closed]

I have a cannon that shoots a projectile at an angle of 30°, the projectile hits a wall at 2.5m and it does so when the velocity only has a an horizontal component. I need to find the initial speed, ...
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68 views

Maximum range of a projectile (launched from the cave) [closed]

A cannon located under a cave forms an alpha angle with the horizontal launching a series of projectiles. The cannon is at point A, at a distance L from the base of the cave (point B). If the initial ...
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2answers
103 views

How do you correctly apply $a=v\cdot\text dv/\text ds$? [closed]

I know that $a=v\cdot\text dv/\text ds$ can be deduced by simple algebra and calculus and is correct. But once I was analyzing the motion of a ball projected straight up in free gravity. If I apply $...
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61 views

Ballistic with friction - what is wrong with my reasoning?

I consider a ballistics problem with friction: Here is a graphical representation of it: I know from the textbook that the solution is: Which is different from what I found. Here was my ...
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29 views

Trajectories of a thrown object (with bumps considered)

Assume that I stood at the boundary line of a football / baseball / cricket ground(without any turf/pitch/grass in it) - just a plain ground - like play ground. I have a ball that can bounce when ...
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2answers
106 views

Why do we subtract the velocity of the gun barrel to find the velocity of bullet in classic gun barrel problems?

The very subtle conceptual problem I'm having is that assuming the gun barrel is at rest...and then it fires the bullet by means of an mini explosion of gunpowder let's say then it is delivering the ...
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1answer
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An exploding projectile [closed]

A mass $3m$ is thrown with a velocity of $20\sqrt3$ m/s at an angle of $30^{\circ}$ to the horizontal from a point, say $A$, on level ground. After reaching a certain height, $h$, it explodes into two ...
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Features of a Jet of Water

Having created a water rocket that operates with compressed air forcing water out through a bottle's nozzle, I was interested in the some of the features of the jet of water that can be seen using ...
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2answers
58 views

Flight time of spherical bullet fired horizontally versus dropped vertically / effect of crosswind on spherical car

Would a spherical bullet fired horizontally from a musket stay aloft longer than a spherical bullet dropped from the same height? I know two similar questions have been asked (Will a bullet dropped ...
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1answer
34 views

Bouncing ball physics

Do we generally ignore energy loss in kinematics when the ball ,falling under gravity , is bouncing back.Because below graph shows that Ball got the maximum velocity with which it was thrown earlier,...
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Why is the velocity in the horizontal direction constant for 2D projectile motion?

For 2D projectile motion, why is the velocity in the horizontal direction constant? I learned that we neglect air resistance, but why? And isn't there horizontal acceleration at the beginning when ...
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Why does a torpedo travel farther than a bullet underwater?

We know that to move in water we require more energy. Even shooting a gun, the bullet travels a very small distance. But how could torpedoes move so fast inside the water? If they have such an energy ...
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Ambiguous angle for projectile

A projectile is launched with at an angle $\theta$ to the horizontal with speed $v_o$ along an incline of $\alpha$ to the horizontal. Find the angle of projection that maximizes the distance traveled ...
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26 views

Under what angle should we kick a ball at the foot of a hill in such a way that it falls back to us? [closed]

Under what angle should we kick a ball situated at the foot of a hill with incline $\varphi$ so it falls back to the starting point? Find the solution for the first rebound. Under what angle should ...
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1answer
66 views

Muzzle Velocity of a Bullet out of a Barrel

We want to know the speed of a bullet, in feet per second, for a given round. We know the weight of the bullet, volume of the casing, amount of gun powder, length of the barrel, and diameter of the ...
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1answer
72 views

Dropping a stone velocity

I'm asked to calculate a stone being dropped from rest to hit the water it takes 2.7s I found the final velocity to be 26.46m/s
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1answer
86 views

High velocity mushrooms?

So y’all know meteoroites burn up in our atmosphere I’m looking for an equation or something that will allow me to calculate how fast a substance can move before it starts to burn up. Specifically I’m ...
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1answer
62 views

Use of direction of downward velocity in equation of motion

[NOTE: I am not asking anyone to solve the question below but to point out where I might be wrong] Q- A skier jumps from a horizontal track and lands on a steeper track with a launch angle of ∅=11.3°(...
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Propelled projectile motion

I have a problem with understanding how a propelled projectile (a projectile with rocket thrusters) would act. I'm building a simple simulation for projectiles (something like: https://en.wikipedia....
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2answers
125 views

How fast will bullet hit the ground if it is shot vertically?

The bullet can be normal AK-74 or M4 bullet. I am just interested to know how much speed it loses due to friction.
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1answer
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What happens to a medium when it is impacted by a projectile whose velocity is higher than the respective medium’s speed of sound

From my understanding, the speed of sound in a medium is the rate at which energy can be conferred from one constituant particle to another (whether this be an atom, or molecule). So if a projectile ...
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23 views

Projectile Motion Components of Velocity and Speed

In kinematics, I am told that the vertical velocity at the apex of projectile motion is 0. There is still a constant horizontal velocity. Given this, are we not allowed to generalize and say that at ...
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2answers
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Basis of 2D motion analysis

The basic argument for analysing 2D motion is that if we have a projectile we can break its 2D motion into 2 1D motions along 2 perpendicular axes. The motions along these axes and their corresponding ...
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1answer
68 views

Projectile, the focus of its parabolic path, and the circle drawn through the focus

Consider any projectile O and its path. Assume that drag or any other type of non-conservative or resisting force doesn't exist and that only that gravitational pull of the earth exists. Note: Let the ...
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7answers
86 views

Why we take only the vertical component of a projectile's velocity while calculating the “Time Of Flight”?

when we calculate the time of flight for projectile with no drag we use second equation of motion i.e. $$S=V_i t + at^2/2$$ further, we put $V_i=V_i\sin\theta$ and $a=-g$ i.e.: $$S=V_i t\sin\theta - ...
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1answer
67 views

Is Verlet method suitable for to solve projectile motion with quadratic drag?

Consider the following non-dimensional equations of projectile motion in presence of air resistance, I understand it can be numerically solved using the mid-point method, but can I also use Verlet ...
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2answers
77 views

Projectile with air resistance from a given hight

Objects take same time to fall a given height independent of their horizontal speed when air resistance is ignored, is this also true when air resistance is not ignored? In presence of air resistance, ...
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1answer
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Maximum distance of a body in projectile motion from origin [duplicate]

Suppose a body is in projectile motion then what will be the maximum distance it can attain from origin? Also in what case the range will be the maximum distance from the origin compared to other ...
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1answer
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Horizontal Free Fall

Let's say you are launched out of a canon at a $0^\circ$ degree angle 5 feet off of the ground. Normally, from my basic understanding of free falling, you have to be move unimpeded with no force ...
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5answers
110 views

Couldn't you use a spring to increase energy?

When I was a kid I had a BB gun and when it was cocked it would compress a spring, then when you pulled the trigger, the spring would be released and fire a BB out at high velocity. I was thinking, ...
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1answer
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How did Carnevale et al. could argue mass in a ballistically aggregating systetm evolves as $t^{2d/(d+2)}$?

I am trying to understand this paper but I am not able to do it. Please help. See the paper here. First of all how could they write collision time $t_0$ as given there?. I am not able to get it even ...
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1answer
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What should be the speed of my bullet be to punch a nice round hole through a paper sheet?

If my bullet travels faster will the amount of damage done to the paper be lesser? Due to inertia of the paper can the bullet make bullet shaped holes instead of making a big hole as the speed ...
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4answers
133 views

Can we do a thought experiment to prove that the horizontal and vertical motion of a projectile are independent of each other?

It seems really hard for me to grasp the idea that horizontal and vertical motion of a projectile are independent of each other. Intuitively I feel that they should affect each other. How can it be ...
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2answers
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Do faster moving projectiles make larger penetration holes? [closed]

When it comes to shooting guns, a bullet of a certain size will make a certain size hole in the paper or wood target. A $.22$ bullet makes a pea size hole regardless of if its shot out of a pistol ...
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1answer
71 views

Projectiles with unequal initial velocities, purely horizontal

If projectiles $A$ and $B$ are projected horizontally with different initial velocity from the same height, then both $A$ and $B$ possess the same vertical component of velocity, at any instant. ...
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7answers
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Why does the Earth follow an elliptical trajectory rather than a parabolic one?

I was taught that when the acceleration experienced by a body is constant, that body follows a parabolic curve. This seems logical because constant acceleration means velocity that is linear and ...
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1answer
139 views

The phase space trajectory of a single particle falling freely from height is? [closed]

The phase space trajectory of a single particle falling freely from height is? Phase space is a plot between momentum and position, and since kinetic energy increases the momentum must increase with ...
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5answers
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What happens when the drag force exceeds the weight of an object falling into earth?

Let's say a meteor is coming towards earth. It's not accelerating, but it does have an initial velocity. This meteor is shaped so it has an insane amount of drag, enough to even exceed its weight (not ...
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6answers
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How is speed affected (or not affected) by acceleration by gravity?

I am a new physics student and I was reading a question posted on here earlier: Which Sphere is Fastest? It posits that three spheres thrown with the same speed at the same point (one thrown ...
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3answers
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Which sphere is fastest? [closed]

I was doing a physics problem, and it seemed simple at first, but now it doesn't at all, and I need help. Here it is. Three identical spheres are thrown from the same height above the ground. Sphere ...
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3answers
108 views

Why can I throw a larger stone farther than a smaller stone?

Recently I was throwing stones(don't ask me why) when I noticed that there seems to be an optimum weight of stone so that it travels the farthest. If I generate the same amount of force each time(and ...
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2answers
51 views

Throwing/Dropping an Object

When we throw or drop an object while moving, do we impart it our acceleration or velocity or both? Say i throw a ball at 5 m/s (relative to me) while at say, 30° to my direction of motion, then will ...
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Is Bernoulli's equation the correct explanation of a curved soccer ball? [duplicate]

I saw a lot of materials supposing that the Bernoulli's equation explains the curvature of a soccer ball: since the ball is spinning, two sides of the ball would experience different velocities, and ...
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1answer
72 views

Why doesn't the coriolis force cancel out when a ball is thrown up?

The question is to calculate the lateral displacement of a ball due to the coriolis force once thrown up and allowed to come back down. The initial equation to work with is $\ddot{x} = -2\omega \dot{...
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At what speed in air would a solid object turn to plasma?

Just curious, friction can heat up what ever is moving. The faster something moves the quicker it heats up. Is it possible in the perfect scenario to turn a speeding solid object to plasma through ...