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Questions tagged [projectile]

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

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40 views

Equations of motion in a free fall with friction [on hold]

I treat this problem in 1D. Let $F_G=mg$ be the gravity force and $F_F =-\lambda \dot{z}$ be the friction force with $z$ the vertical position. I try to find velocity and position as a function of ...
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How to find the initial speed on the y axis while only having $Dy$, $Dx$, angle, and acceleration? [on hold]

Is it possible to find the initial speed of a projectile on the y axis while only having $D_y$ (distance on the y axis), $D_x$ (distance on the x axis), the angle and $a_y$ (acceleration on the y axis)...
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Can someone explain what is the force the ball will exert?

If a ball is falling under free fall then the force exerted by the ball on the ground would be $mg$. But that's not the case in real life ball would hit with more force. But when i draw free body ...
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PYTHON, project tile motion with air resistance [on hold]

On October 24, 2014 Alan Eustace, a Google executive, lifted himself in a helium balloon to an elevation of 41,420 meters above sea level. At that height he separated from the balloon with an ...
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Question is in description [on hold]

If a volleyball gets served at a height of 2ft at 15m/s from one side of a 60ft court over a 7ft net, what angles will make the ball travel the whole court exactly?
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Projectile landing at different elevation [closed]

A ball is kicked at an angle of 30 degrees from the horizontal from point A and lands at Point B which is located 15 ft horizontally ahead and -9 ft vertically. There is also an equation provided, $y=-...
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1answer
32 views

Why don't all the bodies accelerate as all of them are brought into motion through a force?

Like in a Projectile, why isn't there an acceleration in the horizontal direction? I've seen things like there isn't any force acting (in the horizontal direction) but for the body to move there must ...
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1answer
109 views

What would happen if you drop two objects of the same shape and size but different mass in Earth's atmosphere?

The question of letting two objects fall in vacuum and the effects on gravity is discussed on this site including questions like the gravitational pull of the objects towards each other, the Earth's ...
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Help With a Projectile Motion Problem [closed]

So I have what seems to be a fairly easy projectile motion problem that I just can't solve, I believe I am using the wrong idea and am requesting help! The problem is as follows: A boy on the edge ...
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Finding initial velocity of balls [closed]

Ball A is released from rest at height h above the ground. At the same time, ball B is projected vertically upward with initial velocity u. After some time, two balls are at the same height above the ...
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1answer
58 views

Analyzing Velocity vs time graph

So I did an experiment on conservation of momentum, where two carts with different mass start at rest and get accelerated and we measure the speed. What I observed was that after the acceleration, ...
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1answer
44 views

About stoke 's formula

Why does the acceleration decrease whereas velocity increase for a freely falling spherical body inside a viscous liquid
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Derive ballistic equation using conservation of energy, stuck with (dx/dt)^2 [closed]

When observing a falling particle, it's easy to derive the trajectory using the following reasoning: the particle is subject to one external force mg and by taking ...
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21 views

Trajectory of a projectile in 3d coordinate knowing the angle, the target position and with possible height offset

I'n not that good in math and physics sadly but I want to understand one problem I'm facing right now. I am in a situation with a projectile shoot from a random height on direction of a target with ...
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2answers
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1D falling object, and terminal velocity

I'm simulating a very simplified scenario of a missile falling to earth after being deployed at altitude. Currently I'm evaluating 1D only assuming the missile has already turned and is in a stable ...
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Why does a spinning disc turn before it fades?

I have recently gotten into disc golf, and an interesting phenomenon happens when you throw a disc hard. If you throw a disc right hand back hand, so that the disc spins clockwise, at high velocities ...
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48 views

Should not the acceleration acting on the stone being dropped be $a$ as well along with $g$?

the question is: A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is (a) a upward (b) (g-a) upward (c) (g-a) ...
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How and why the acceleration of the ball during contact is different from $g$?

The Q is: My teacher said that the acceleration of the ball during the contact will be different from 'g' and therefore we have to treat the downward motion and upward motion separately . My ...
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1answer
36 views

Projectile Motion, solving for initial velocity [closed]

I'm stumped on a projectile motion launched from a cliff at an angle. The only known values that are given are the height of the cliff $h$, The total horizontal distance covered $d$ and the incline of ...
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31 views

How can I find the initial velocity of a projectile from its range, when accounting for air resistance?

I'm trying to find the initial velocity of a projectile based on it's range. I know how to use kinematic equations to do this when air resistance is ignored, but I'm not sure how to take into account ...
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1answer
53 views

Does changing mass change projectile speed? [closed]

If a projectile is fires from a pistol with 10g mass, and somehow during flight it's mass is increased to 1000g, how does this affect it's projectile speed? (This is a DnD hypothetical question). I ...
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2answers
36 views

simple work and kinetic energy problem (baseball)

problem says: A baseball player throws a ball with a mass of $0.150kg$ with a speed of $40.0 m/s$ and an angle of $30$ degrees. What is the kinetic energy of the ball when it reaches the highest ...
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Turning of arrow towards earth when it comes back after throwing at some height [duplicate]

When an arrow goes in an upward direction and when it comes back after reaching some height, it changes its direction and its head moves towards Earth now. My question is why it does so related to ...
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1answer
45 views

How to locate where a ball hits the ground? [closed]

I want to locate a small ball when it hits the ground before it rolls or bounces. Consider a robotic gun fires a plastic pebble at an angle like artillery. The ball flies in the air about 0.5 seconds ...
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1answer
60 views

Projectile with linear drag [closed]

A particle with mass $m$ travels with speed $v_0$ and angle $\theta$ compared to the horizontal ground. Air resistance given as $F_R = -m \alpha v$, where $v$ is the particle's speed, is working ...
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1answer
80 views

Free fall movement with air resistance [closed]

For small free-falling particles in the atmosphere, the air resistance is proportional to the velocity (orienting the y axis vertically downwards, is of the form $-\rho y'(t)$, with $\rho > 0$. ...
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1answer
51 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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1answer
74 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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2answers
33 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
130 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
43 views

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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79 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
106 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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63 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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1answer
37 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
115 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
88 views

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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1answer
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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
64 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
42 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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2answers
37 views

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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2answers
104 views

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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0answers
29 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
83 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
74 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
90 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
69 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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42 views

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
137 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.