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Questions tagged [projectile]

This tag is for questions relating to projectile, object moving through space due to the exertion of a force. The path of a projectile is called its trajectory.

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Draw the angle graphically [closed]

Hi everyone (sorry for the "unclear" title), I'm having trouble graphically representing the point of this: A stone is thrown from the top of a tower with $h = 50\text{m}$ and with a ...
Pizza's user avatar
  • 11
-2 votes
5 answers
105 views

When an object is thrown towards the sky it starts to gain potential energy, why?

I didn't think so because when an object is thrown towards the sky it already has kinetic energy and it looses it's energy due to the gravitational force of the earth. When the object looses all of it'...
Priyanka Bahadur's user avatar
0 votes
1 answer
48 views

Issue with simplifying the equation related to non-uniform acceleration

I am exploring how the cross sectional area of a drogue chute affects its velocity after travelling a set distance. I got this equation: $$m_1 a = m_2 g - \frac12 c_d \rho A v^2,$$ This covers the ...
Melon's user avatar
  • 1
30 votes
2 answers
3k views

Error concerning projectile motion in respected textbook?

In the textbook Fundamentals of Physics by R. Shankar of Yale Open Courses, appears the following assertion pertaining to a car driving off a cliff, which seems correct: This is exactly how long it ...
Trever Thompson's user avatar
0 votes
0 answers
35 views

If a human falls upright into water, from air at terminal velocity of approx 80m/s, what could be an estimate for their velocity just entering water? [closed]

If a human falls upright into water, from air at terminal velocity of approx 80m/s, what could be an estimate for their velocity just entering water? Like just when they become submerged by the water
Yifan YIN's user avatar
0 votes
2 answers
49 views

For an objective falling, reaching terminal velocity and then hitting the ground, how can I find the force it exerts on the ground? [closed]

For example object with v=tanh(0.1213)t/0.01236. m=69kg. I thought I had to use F=mv/t but that just gives the net force of the object while falling. I don't know how to find the force impacting on ...
Yifan YIN's user avatar
-1 votes
3 answers
57 views

Different results of Range of a projectile [closed]

My question is from the Range of a projectile. Range is displacement of the projectile through X-axis. We all know the formula for the range $R$ of the projectile is $$R=\frac{v_0^2\sin(2\theta)}{g}$$ ...
Riju Mandal's user avatar
0 votes
2 answers
42 views

How to find the resultant speed component, and finding the angle in which the trajectory had hit the ground?

When having a trajectory traveling over a projectile, both the vertical and horizontal velocity components must be obtained in order to calculate the resultant velocity. The question is: Why the ...
Mohammad Osama's user avatar
0 votes
0 answers
51 views

Rocket equation non-constant gravity

I am currently trying to teach myself differential equations and wondered about the following problem. You have an object (a rocket of constant mass $m_r$) and initial velocity $v_0$ that tries to ...
Imago's user avatar
  • 253
2 votes
1 answer
43 views

Trajectories of projectile based on different speeds of projection [duplicate]

So my teacher was teaching gravitation and an interesting fact that he mentioned was the trajectory of a projectile projected from Earth at a speed equal to escape velocity, is parabolic. Also, he ...
NPC's user avatar
  • 21
1 vote
2 answers
138 views

Vertical trajectory of a projectile with quadratic drag

I was wondering is there is an equation (or function) that can predict the apogee time and height of an object given its current acceleration and the usual constants ( mass, drag coefficient, cross ...
Frontiers Aerospace's user avatar
11 votes
1 answer
1k views

Why does the cross section of a metal after a hypervelocity impact look like that?

Look at this image of a cross section of a piece of (I assume) metal after a hypervelocity impact: I understand where the crater shape comes from, but what puzzles me is the cavity near the bottom: ...
paulina's user avatar
  • 1,906
1 vote
1 answer
62 views

What happens to $\frac{d}{dt}\left(\hat{v}\right)$ at the highest point a projectile reaches when launched vertically upwards?

Acceleration is given by $\dot{\vec{v}} = \frac{d}{dt}\left( v \hat{v}\right) = \dot{v} \hat{v} + v \dot{\hat{v}}$. What happens to $\dot{\hat{v}}$ when the direction of velocity flips by $180^o$? E....
Anis Manuchehri-Ramirez's user avatar
0 votes
1 answer
79 views

General solution for the motion of a 1D particle with drag

Consider a particle of mass $m$, with equation of motion $$m\ddot{x}=-U'(x)-f(\dot{x})\dot{x}.$$ I am trying to find an equation of the form $v=g(x)$ so that we can reduce this to an integral of the ...
Don Al's user avatar
  • 1,092
2 votes
2 answers
206 views

Need help regarding projectile motion

While studying motion in 2D, I came to know that when an object, projected with some initial velocity, making angle $0°$ with the horizontal, will have zero range. Its a bit confusing. The object has ...
Ishaan's user avatar
  • 517
-1 votes
1 answer
44 views

Components of velocity in projectile motion [closed]

I came across this question in my physics textbook (Gr12) and I was hoping someone could explain the solution to me A ball is thrown horizontally off a building at $8.2\,\text{m}/\text{s}$. At a ...
Nathan's user avatar
  • 3
0 votes
3 answers
71 views

Is it necessary that a particle attains terminal velocity?

In a viscous medium, consider a ball travelling under the influence of gravity and viscous force. Is it always necessary that during its time in air, the ball attains terminal velocity
Kampann's user avatar
  • 151
0 votes
2 answers
38 views

Question regarding projecticle in freefall disregarding air resistance [closed]

This question is regarding the following problem A stone is thrown up from the top of a tower 20 m with a velocity of 24 m/s at an elevation of $30^\circ$ above the horizontal. Find the horizontal ...
koiboi's user avatar
  • 173
0 votes
1 answer
42 views

How can we measure the kinetic and potential energy of a horizontal projectile?

Say a baseball is shot from a batting machine in a straight line (I don't know much about baseball, but hopefully this makes sense). Normally, when demonstrations on kinetic and potential energy are ...
user386598's user avatar
1 vote
2 answers
67 views

Is the $y$-component of projectile motion independent of the $x$-component or not?

In projectile motion, it is said that both the $x$ and $y$ components are independent of each other but according to the equation of the trajectory, $$y = x \tan\phi - \frac12 g x^2/(u^2\cos^2\phi)$$ $...
Sai Varun 's user avatar
0 votes
2 answers
44 views

Equations of motion for constant acceleration

I read that the equations of motion for a constant acceleration can be represented in a scalar form as well as a vector form, but what's the need to do them in vector form what extra can we do by ...
Manish's user avatar
  • 51
0 votes
1 answer
44 views

Terminal velocity gravity against first-order drag force

Let's say that we have a falling object with two forces acting on the object: gravity $F_g = mg$ and a first order drag force $F_d = kv$. Terminal velocity will be reached when gravity is equal to the ...
Stallmp's user avatar
  • 665
1 vote
2 answers
41 views

Setting $u$ = escape velocity when calculating the maximum height of a thrown object

So, if I throw an object at some velocity $v$ at an angle θ, the maximum height reached by the object is $\frac{v^2\sin^2{\theta}}{2g}$ but, I know this isnt true. clearly in a weird way, the height ...
uggupuggu's user avatar
  • 129
1 vote
2 answers
82 views

Dropping a stick down with an angle

Let's say that we drop a stick down with an angle, meaning that the stick is not parallel to the ground. Assume there is only gravity. Is it correct that the orientation of the stick will not change ...
Stallmp's user avatar
  • 665
0 votes
2 answers
31 views

Relative trajectories of two projectile [closed]

Two balls are launched with different initial velocities and at non-coplanar angles (meaning they could be in entirely different planes).Not Considering the effects of air resistance, describe the ...
user avatar
-2 votes
2 answers
162 views

How to Measure the depth of a Hole by Dropping a Rock? [closed]

Let's say I have a rock and a stopwatch. I am standing on the edge of a deep hole or canyon, and can see the bottom. How would I go about measuring the depth of the hole?
Arrow's user avatar
  • 101
2 votes
3 answers
50 views

Constant speed (at terminal velocity) and zero $g$

I have read the question What would a person experience in a free-falling elevator in a shaft long enough to reach terminal velocity? here and the answer was that you feel exactly the same if the ...
sirzento's user avatar
  • 129
3 votes
2 answers
210 views

Why will a cylinder tend to freefall on its side?

In a video I saw about the U.S. military’s idea “Rods from God”, it said a uniform steel cylinder will tend to freefall in the air on its side if not corrected. It won't freefall vertically if left to ...
Wyatt's user avatar
  • 275
7 votes
7 answers
3k views

How do objects reach terminal velocity?

I understand the basics of this principle: the force of gravity acting downward on an object becomes equal to the air resistance acting upward on the object because as the object speeds up, air ...
user386598's user avatar
0 votes
1 answer
14 views

Resisted vertical projectiles

My textbook writes this equation for the vertical acceleration of a particle undergoing 2D resisted projectile motion (the resistance is linearly proportional to velocity). The situation is simply the ...
Percival the caterpillar's user avatar
0 votes
1 answer
73 views

Why do objects with more mass fall at a faster rate (factoring in air resistance)? [duplicate]

My class had to do an online simulation about the different free fall times of objects, both on Earth and in a vacuum. In it, I noticed that in an atmosphere, objects with greater mass fell faster ...
user386598's user avatar
0 votes
1 answer
35 views

Is is possible to design a cup lid that doesn't alter the trajectory of the cup when thrown?

First, some context to my question. Second, I do not have a background in fluid dynamics/engineering. Liberal Arts major FTW. I've been running observational experiments with my 14 year old to ...
Adam Robinson's user avatar
0 votes
1 answer
53 views

Doubt in Kleppner classical mechanics chapter 1

So I know that I can approach it by first finding $H_1$ which is height till time $T_A$ and then I can find Height till B measured from origin $H_1= \frac{1}{2} g(T_A)^2$ and then $H_2= \frac{1}{2} g(...
Alam's user avatar
  • 3
0 votes
0 answers
44 views

Parabolic(?) projectile orbits as an approximation to elliptical orbits given a rotating Earth

Why is projectile motion a parabola given that the Earth rotates and a parabola is an approximation to an orbit. My current thought is that projectiles don't travel in a parabola because if the Earth ...
Steven Dorsher's user avatar
2 votes
1 answer
126 views

Ball trajectory in the game of pétanque - unexpected drag results

Context A classmate and I (about college level, not physics majors)need to evaluate the different physical factors at play during a game of pétanque. We thought about estimating the importance of air ...
François Mortier's user avatar
0 votes
1 answer
76 views

Calculating jumping distance?

I'm trying to figure out how to calculate the jumping distance of a person or animal based on body weight and initial speed, but I can't seem to find any relevant information online about this. Is ...
Papa Solen'ya's user avatar
1 vote
3 answers
88 views

How does a mass ejected at escape velocity keep moving till infinity?

I've studied that if a mass is ejected from the surface of the Earth at 11.2 km/s (or at any point above the surface at a lower Ve), it 'escapes' to infinity. Does that not imply a violation in the ...
Mel's user avatar
  • 133
2 votes
0 answers
61 views

Why is it so much easier to kick a basketball when it is just bouncing back from the ground?

A basketball coach showed me that when you bounce a basketball back from the ground, it is much easier to kick it far away (actually it shoots out like a rocket), but when you want to kick it like a ...
Árpád Szendrei's user avatar
1 vote
1 answer
65 views

Would a black hole be slowed down as it passed through a large solid object?

Say I get careless and drop a black hole. It falls through the Earth, passes through the core, and comes out on the other side. Idealised as point masses, the black hole would reach an equal height on ...
spraff's user avatar
  • 5,148
0 votes
1 answer
75 views

Why are NASA etc so good at hitting tiny targets in tiny time windows?

NASA have a tendency to arrive at targets that are so far away, within seconds of ETA, and statements like " it's like throwing an object from New York and having it hit a particular key on a ...
Rabbi Kaii's user avatar
0 votes
0 answers
20 views

Height of weight dropped vs launch distance

Say you have a system where a weight drops on an air source, which blows on the ball, launching it. Are there any relations or formulas between the forces at work here? For instance, would there be an ...
Astrovis's user avatar
  • 187
0 votes
1 answer
34 views

How does moving the launch area forward impact the area of impact?

If we launch an object in some way, and it lands at distance x, if we move forward the launching mechanism y units forward or backwards, will the landing distance also move forwards or backwards y ...
Astrovis's user avatar
  • 187
2 votes
2 answers
582 views

A ball was thrown horizontally but it has zero horizontal initial velocity? [closed]

A question I faced reads "A ball is thrown horizontally from a height of 25m and hits the ground with a speed that is 4 times its initial speed. What is the initial speed?". It said the ...
petit beauté's user avatar
-1 votes
3 answers
73 views

Why catching a ball of high trajectory easier in Cricket match? [closed]

my question is related with Projectile motion, it describes about the high velocity of ball on its trajectory. it asks about the conditions of height, time of flight, range as well.
Farheen's user avatar
0 votes
1 answer
34 views

Spin velocity in table tennis

I have read on papers that argued, when flying, we have constant spin velocities $\omega_x, \omega_y, \omega_z$, that primarily depend on the initial spin setting e.g., topspin, bottom spin and ...
a piece of something's user avatar
4 votes
1 answer
59 views

Time taken for ball to reach down is more? [duplicate]

If we consider a practial situation, where air resistance exists, why does a ball/object take more time to come down than to go up? This seems contradicting to me at the first glance, but I am pretty ...
bobby76's user avatar
  • 45
0 votes
1 answer
69 views

How optimal launching angle is affected by mass?

I'm writing a code to calculate the maximum optimal angle for motion under linear drag and how it's affected by mass. It appears that for the most part this angle is independent of mass and not of ...
KatJ11's user avatar
  • 1
1 vote
2 answers
137 views

Would an object stop if the only force acting against it is air friction? [closed]

This question has bothered me for some time couple of years ago, so here is the main problem: Suppose that an object of mass $m$, is thrown with horizontal velocity $v$ on a horizontal, frictionless, ...
CuriousCrypto's user avatar
1 vote
1 answer
109 views

Projectile of an object thrown from rotating planet

Last night I couldn't sleep for some time because of thinking this problem. The starting point of this problem was actually "If we were to jump perfectly vertically on earth, would we land on the ...
CuriousCrypto's user avatar
0 votes
0 answers
48 views

Problem on orbital motion

Let's say an object is thrown from Earth with a speed of v at an angle $\theta$. An ellipse is formed with the center of Earth as its foci(given in the figure). We know that $v_x^2=2GM(\frac{1}{r_x}-\...
Star Gazer's user avatar

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