Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [projectile]

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

0
votes
2answers
52 views

How far can you pee on the moon vs. mars? [on hold]

Let's suppose you are at Elon Musk's Future Mars colony and you drank too much beer, how far can you pee on Mars if you can pee one meter on earth? If the next day you get on the shuttle to the ...
0
votes
0answers
25 views

Reverse engineering Newton's approximation of impact depth

I recently learned about Newton's approximation of impact depth, Depth = (Projectile Density / Target Density) * Length of the projectile. Where length and depth is measured in meters, and density is ...
0
votes
1answer
35 views

When a particle moves perpendicularly to it's projection direction [on hold]

Could anyone please help me with the following: This is concerning the flight of a projectile. Specifically the point in it's flight at which it's velocity vector becomes perpendicular to its initial ...
1
vote
1answer
33 views

Projectile motion launched at an angle and landing higher than start [on hold]

If a projectile is launched from the floor, and lands at an elevated height how would one find the initial velocity given only (angle of launch, angle of ending elevation, total distance, and gravity?
-2
votes
1answer
47 views

Simple Kinematics question [closed]

So this is a pretty simple kinematics question I was working on but I completely skipped over a derivation. Here's what I did to solve for the first part: I'm wondering if there is anyway to solve ...
0
votes
1answer
35 views

Graph for Vertical Velocity of an airplane

I'm a fresh Calculus $1$ student struggling to make this graph somehow, I've been studying Chapter $1$ from James Stewart's single variable Calculus early transcendentals. Excercise $1.1$ is easy up ...
1
vote
1answer
56 views

Distance Travelled by a Projectile [closed]

I was trying to find the distance travelled by a Projectile during its time of flight, $t=\dfrac{2u\sin \theta}{g}$. I used the Equation of the Path i.e. Trajectory and built up the Arc Length ...
1
vote
2answers
26 views

Projectile Motion with Horizontal Variable Acceleration?

I am a High School Student and I've started to learn about Projectile Motion. One of the Assumptions made in the text is that the horizontal acceleration must be $0$ for the Equations of Projectile ...
0
votes
0answers
37 views

Varying Gravity and Air Resistance in projectile motion

Salutations, I have been trying to approach a case about projectile motion considering variation of gravity acceleration and air resistance: A spherical baseball with mass "m" is hit with inclination ...
0
votes
2answers
52 views

Range of a projectile

My notes say that the range of a projectile is equal to $$\sin(2\theta)(V_0^2/g) .$$ This equation implies that a ball shot at $0$ degrees has zero range but this isn't true is it? If I kick a ...
0
votes
1answer
25 views

Falling object and the side wind

I don't have a big knowledge on Physics so I'm sorry in advance if it doesn't make sense.. If a brick is falling from 100m tall-building when there's the side wind of 30m/s, is there any way I can ...
0
votes
2answers
72 views

How to calculate materials ability to resist penetration

I would like to ask you this question which I struggle to answer. If I have a plate of some material X to which I am shooting at with a tank main gun with ammunition parameters: weight $= 10\text{kg}...
1
vote
2answers
90 views

Equations for an object moving linearly but with air resistance?

If F be the independent force acting on the object and D be the velocity dependent force acting in the opposite direction of F. The net force accelerating the object is; $$F − D = ma$$ where $D = \...
1
vote
2answers
65 views

Speed of a falling object

When an object is dropped, does it accelerate to terminal velocity? or is it at terminal velocity immediately?
2
votes
1answer
45 views

Does the projectile motion equation work if the initial height and final heights are different?

Hi just a quick question here. Does this equation work if the initial height and final height for the projectile is different? Suppose you throw a ball off a cliff and you want to find the vertical ...
1
vote
1answer
16 views

Projectile Motion | Modify results so the projectile peak would be constant with other trials [closed]

Context Imagine, for my experiment I throw a basketball up and forward, creating a parabolic shape. Let's say that I know I applied 2 N (force), the peak of the parabolic shape from the ground is 1 m ...
-1
votes
1answer
37 views

Kinematic Equations contradicting each other [closed]

For example, there is an object that is being thrown into the air, and we need to find the time it takes for it to reach its maximum height. Here are the variables: a = -9.8 m/$s^2$ $v_i$ = 300 m/s $...
8
votes
3answers
891 views

Gravitational advantage of outer planets in war

The Expanse books cover a lot of aspects of war in a situation where humans inhabit many planets and moons of the solar system. The author makes the point that, in a war situation, the outer planets ...
1
vote
2answers
82 views

Does free fall ever occur on the surface of Earth?

According to the definition of "Free fall", which is "Downward movement under the force of gravity only.", free fall only occurs when gravity is the only force acting on an object. But here on Earth, ...
1
vote
0answers
37 views

Rotational Motion, Kinematics, Air Resistance

When a body is thrown of height in a practical situation ( air is present ) considering air resistance is applying constant opposite force, we could calculate its speed by calculating acceleration ...
0
votes
1answer
68 views

Calculate launch angle of object moving away from view

I'm writing image processing software and my goal here is to take an image of a projectile moving away from the camera and determine the launch angle. What I already know is: The actual size of the ...
1
vote
0answers
48 views

How to accurate scale start velocity in projectile motions? [closed]

I have projectile motion where the angle $\alpha$ is $45^\circ$, and the start velocity is $45\ \rm{m/s}$. We can then expect it to land about $206.422\ \rm m$ away; however, if I were to change/...
11
votes
1answer
2k views

Is there a way to calculate the time taken by a falling object to reach terminal velocity? [duplicate]

I know it is possible to calculate terminal velocity using air density, mass, and drag coefficient, but is there any way to calculate the time taken until that speed is reached (assuming air density ...
5
votes
3answers
243 views

Extracting the 3D coordinates of a moving object from a video

Take a look at these two pictures, which are stills from a video which demonstrates magnus effect in football: I want to extract the coordinates of this ball in 3D space from this video. These are ...
0
votes
1answer
60 views

Does the drag equation only apply to turbulent flow

I am doing an analysis of the motion of an object in air and so I'm first finding whether the flow is laminar or turbulent. From my research, I'm still a bit confused as to whether the drag equation ...
0
votes
1answer
45 views

If two identical objects (A and B) are dropped from the same height, and B has protective packaging, why is B less likely to be damaged?

I know this question has to do with impulse and collision, and if it were in numbers, I could give an answer to it, but how can I explain this in words? Both object A and B are identical, however, ...
0
votes
1answer
50 views

If I push an object underwater, how long before it stops?

If I were to push an object that is completely submerged in water with a know force, how would I go about finding the distance it travels before coming to a stop given that I know the drag coefficient ...
3
votes
3answers
250 views

Falling - is the gain in KE linear? [closed]

When a ball falls from a high place, it experiences a gravitational force. Forces make objects accelerate (in this case, it is constantly increasing the velocity). Because $KE = \frac{1}{2}mv^2$ this ...
0
votes
1answer
27 views

Why does the initial bounce distance (from origin of release) for a ball increase with mass of the ball?

I have completed an experiment on the effects of the wetness of a ball on its trajectory when projected. What the data I collected says that the more wet a ball is (determined by the mass of the ball ...
1
vote
0answers
31 views

Projectile Motion (inclined to an axis) [closed]

A target is fixed on the top of a pole 13 metre high. A person standing at a distance of 50 metre from the pole is capable of projecting a stone with a velocity 10√g m/s. If he wants to strike the ...
1
vote
1answer
56 views

Finding initial speed $v_0$ of a projectile given horizontal ranges measured at various launch angles

A spring-gun projects a small rock from the ground with speed $v_0$ at an angle $\theta_0$ above the ground. You have been asked to determine $v_0$. From the way the spring-gun is constructed, you ...
1
vote
3answers
76 views

Can average acceleration be exactly determined from discrete points separated by equal time intervals? [duplicate]

I am using the American dialect of the English language. The following definitions distinguish my question from the similar, previously asked question: https://ahdictionary.com/word/search.html?q=...
1
vote
1answer
50 views

How does density of paraffin wax change with temperature in a solar heater? Is there any equation?

I need to know what is the relation between density of paraffin wax and temperature in a solar water heater. I need to know the equation of density in terms of temperature.
1
vote
5answers
90 views

Which ball will hit the ground first?A ball simply dropped or a ball thrown across the room?

I've read that gravity doesn't affect an object's horizontal motion or vice versa, and some people told me that both balls will reach the ground at the same time. How is this possible, isn't that when ...
0
votes
2answers
48 views

Calculus - Equation for rocket max height

I made myself a question involving calculus and physics just for fun but can't figure it all out. A rocket with mass $1000kg$ launches with a net force of $5000N$ for $5s$. Find the maximum height ...
-2
votes
1answer
53 views

2-D motion Question [closed]

A bottle dropped from a balloon reaches the ground in 20 s. Determine the height of the balloon if (a) it was at rest in the air and (b) it was rising with a speed of 50 m/s when the bottle was ...
2
votes
5answers
112 views

Instantaneous velocity

So here’s a question I’ve been thinking of for a while. Suppose we say, “an object is having an instantaneous velocity along a particular direction ( say 10 m/s along the $x$-direction)” . Is it fair ...
-2
votes
1answer
67 views

Kinematics Issue w/ negative Velocity [closed]

Given: $$Y = v\sin(\theta)t-\frac 12 gt^2$$ $$D=v\cos(\theta)t$$ Thus: $$\frac{D}{v\cos(\theta)} = t$$ Substituting we get: $$Y=v\sin(\theta)\frac{D}{v\cos(\theta)}-5\left( \frac{D}{v\cos(\...
0
votes
1answer
64 views

Why we ignore the negative value of time?

solving a quadratic equation we get two values of $x$ in calculating time for different numericals. a positive and a negative value comes.why we ignore the negative value? some logical answer except ...
2
votes
1answer
48 views

Why does the axis of rotation of a thrown football rotate downwards as it travels along its trajectory?

When a quarterback throws a pass, the football is angled upwards relative to the surface of the field, but progressively rotates downwards along it's path of travel. When initially released, I can't ...
0
votes
1answer
59 views

Soccer parabolic trajectory problem [closed]

I'm in my first college year and we've been given some HS style Physics problems to refresh our knowledge. There is one of the problems which I'm almost sure lacks necessary information. A soccer ...
40
votes
10answers
15k views

When you hit a baseball, does the ball ever travel faster than the bat?

It seems impossible, yet I'm thinking that maybe because the ball compresses against the bat a bit it acts a little like a spring, and DOES travel faster than the bat? EDIT: This is just a ...
-3
votes
2answers
63 views

Understanding relation between work and energy [closed]

Consider you are travelling on a board in the space moving with 5m/s velocity. There is no force acting on it. Now consider you have 2 stones of 1kg in your hand. So the stones also had 5m/s velocity. ...
1
vote
4answers
77 views

Why is it much more difficult to horizontally throw a toy balloon than a football?

If you horizontally throw a sphere of radius $R$ it will feel, in this direction, a drag force due to air. Assume the drag is given by Stokes law, $F_D=6\pi\eta R v$, where $\eta$ is the air viscosity ...
1
vote
2answers
103 views

Sign problem in projectile with drag

So recently, I've been playing around with the variables in projectile motion with drag to see how the trajectory changes. I had my ODE and solved it using separation of variables but the equation ...
-3
votes
2answers
42 views

Drag force equals weight

we are doing lab in mechanics class.The task is find terminal velocity of drop of coffee filter and drag force 's constant $B$ in graphically as equation like $mg = Bv^2$ so basically drag force ...
1
vote
1answer
45 views

Why do we use $m\frac{dv}{dy} = -b(v-v_{ter})$ while determining how the terminal velocity is changing for an object falls down in linear drag force?

Why do we use $$m\frac{dv}{dy} = -b(v-v_{ter} )$$ while determining how the terminal velocity is changing for an object falls down in linear drag force . I was Jr Taylor's classical mechanics. In the ...
0
votes
1answer
72 views

What equation describes the path of a ball tossed in the air?

I am trying to understand a lecture on stationary action and got stuck right from the beginning. The professor says if he tosses a ball in the air it will be described as $$X(t) = (1/2)gt( T- t).$$ ...
1
vote
2answers
401 views

Conservation of energy when dropping a ball [duplicate]

If we drop a bowling ball from one meter above the earth's surface, we are converting its gravitational potential energy to kinetic energy. When it hits the floor, it transfers its kinetic energy to ...
0
votes
2answers
128 views

Work done by air resistance

How can air resistance do work on a freely falling body on earth. then it's displacement is only due to gravity. I think Air resistance doesn't displace the body falling. So what is the meaning of ...