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Questions tagged [projectile]

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

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1answer
45 views

If you throw a rock and drop an identical rock, at the same speed, which one makes a bigger splash?

I'm not so sure how I can solve this problem: I stand on a bridge and throw a rock at 7.5 m/s upwards. I then throw an identical rock with the same speed downwards. In each case, I release the rock ...
8
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3answers
855 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 ...
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2answers
73 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, ...
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0answers
36 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 ...
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0answers
31 views

Over the pipe (analytical mechanics) [on hold]

The problem is relatively simple: A frictionless cylindrical pipe with radius $r$ is positioned with its axis parallel to the ground, at height $h$. What is the minimum speed at which a ball must ...
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1answer
53 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 ...
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0answers
45 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
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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 ...
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0answers
8 views

Why is the distance covered of two efflux, from holes in a container, equal in certain cases?

So, as I was trying to figure out the distance covered by efflux at the bottom and at the top of a container (Height: N=10 m), I took two not-very-random points, one being n=2.5m and the other 7.5m (N-...
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votes
3answers
181 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 ...
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0answers
15 views

Body moving in a Projectile [duplicate]

Equation of trajectory of projectile is given by $y =(-g x^2)/2$ (taking vertically upward positive $y$). Speed of projection is?
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1answer
46 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 ...
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0answers
22 views

Modeling projectiles ( Complex)

How do we model a projectile with a non constant value of acceleration due to gravity As acceleration is a function of the y value (+Rad of earth) and the y value is a function of (acceleraiton,t) ...
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1answer
35 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
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3answers
243 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 ...
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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 ...
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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 ...
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1answer
48 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
69 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=...
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1answer
27 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.
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5answers
66 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
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2answers
43 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 ...
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1answer
40 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
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5answers
107 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 ...
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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(\...
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1answer
55 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
40 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
52 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 ...
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votes
2answers
61 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. ...
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4answers
72 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 ...
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2answers
98 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 ...
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votes
2answers
38 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 ...
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1answer
43 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 ...
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1answer
68 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 $$X(t) = (1/2)gt( T- t).$$ ...
0
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0answers
49 views

How does Earth's rotation affect long range shooting trajectory? (Coriolis and Eötvös effects)

I know that this has been a well discussed topic on the internet and I read a lot about it, and yet, I still have some doubts. I'm talking about Coriolis and Eötvös effect. Let's start with Coriolis ...
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2answers
238 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
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2answers
78 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 ...
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votes
1answer
41 views

Calculating angle of projectile motion with constant initial velocity [duplicate]

The following question was asked by someone few years ago but the question was answered a bit superficially. Previous question: Calculating angle of projectile motion I want to calculate an angle $\...
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votes
1answer
365 views

Is projectile motion a free fall motion? Is the vice versa also true?

We know that in ideal case a projectile will be acted upon by only the gravitational force and hence can it be considered a free fall motion? An object dropped from a height will be under free fall ...
0
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1answer
46 views

How significant is the material in drag force calculations?

I went to Wolfram's "Drag Force Calculator" and received 4900 newtons for a cone that has a radius of 3 meters and a height of 3 meters, moving through air at a standard pressure, 15 celsius, at a ...
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votes
4answers
68 views

Why does bullet falls on the earth if shooter moving back at same speed of firing? [closed]

My friend told me if a shooter moving back at same speed of firing, so when he fires then bullet comes out of the gun and falls on the ground without hitting the target. I am amazed by this ...
1
vote
1answer
92 views

Coefficient of restitution for bouncing ball

If I throw a bouncy ball at the ground very hard, it may rebound to a height greater than that from which it was thrown. The coefficient of restitution is given by $$e=\dfrac{\text{speed of ...
2
votes
1answer
105 views

What is the physics behind the movement of the split-finger fastball in baseball?

A split-finger fastball, or a splitter, is a baseball pitch thrown like a fastball with an v-shaped split finger grip. When thrown correctly, it moves like a fastball, straight in the air, but ...
0
votes
1answer
60 views

While throwing a ball up in the air it doesn't hurt but when it comes back at same altitude it hurts why?

While throwing a ball up in the air it doesn't hurt but when it comes back at same altitude it hurts why? Well have the same amount of momentum in both of the cases. Then why does it hurt when it ...
0
votes
1answer
57 views

Are there two roots for time in projectile equation because the projectile ascends & descends? [duplicate]

Question We can take the kinematic equations for constant acceleration and apply them to projectiles in free fall. One of the equations then reads: $$\Delta y=(v_0\sin \theta )t-\frac{1}{2}gt^2$$ ...
2
votes
1answer
53 views

Abrupt changes in direction and loss of energy [duplicate]

In the picture that I drew above, I was thinking that there is definitely loss of energy when the ball rotates off of the inclined plane to the small section of horizontal plane. However, I do not ...
3
votes
1answer
38 views

Does rotation affect impact of a falling ball?

Let's assume a bowling ball is falling to the ground. It will have a certain impact when hitting the ground. Is that impact only depending on the height it's falling from and the weight of the bowling ...
1
vote
1answer
51 views

Calculating penetration given mass and velocity [closed]

Long story short, I'm trying to design a bullet for a story I'm writing, and trying to work out the math for it myself. The best source I could find was this: http://panoptesv.com/RPGs/Equipment/...