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Questions tagged [projectile]

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

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0answers
21 views

Quarterback Question [on hold]

Quarterback passes football at 8.00m/s at angle of 31.5 degrees above horizontal. How far does it travel horizontally (assuming it is caught at the same height it is thrown)?
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votes
1answer
79 views

Can a projectile bullet kill? [on hold]

Today, I was watching a movie, in which a person shot a gun in air. The bullet went high in sky, became stationary for a moment and dived back and killing a non-innocent person by hitting him in head ...
2
votes
3answers
93 views

How do you actually find the path of least action?

Reading up on Lagrangian mechanics, it's fascinating. Entirely different view, one single rule, a complete alternative to Newton's laws. But how do you actually find the path of least action? Let's ...
2
votes
2answers
147 views

With drag, why does it take longer for an object thrown upwards to fall back down than it does for it to reach its highest point? [duplicate]

Why does it take longer for an object thrown upwards to fall back down than it does for it to reach its highest point? We can draw a free body diagram for when the object is falling down and for when ...
1
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4answers
55 views

Conceptual question regarding velocity in projectile motion vs. up a ramp

I have a question regarding conservation of energy in regards to two different scenarios: In the first case I was told that a ball with an initial velocity, V, was launched at an angle, $\theta$ and ...
1
vote
1answer
38 views

How to calculate air resistance? [closed]

What is the best way to calculate or take into account air resistance? I have an assignment which goes as: Drop an object by itself and with a parachute, calculate air resistance for the parachute. ...
2
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0answers
15 views

Boomerang problem, can't figure out the angular acceleration?

Here is the problem: A boomerang is thrown with an initial linear velocity of 5 m/s at an angle of 30 degrees vertically. The initial angular velocity is $2\frac{revolutions}{s}$At its peak, it has ...
0
votes
2answers
79 views

Is there a minimum range for an Intercontinental Ballistic Missile? [closed]

To be more concrete: Would it be possible to fire a ICBM Minuteman III from Malmstrom Air Force Base in Montana (USA) to hit Helena (the capital of Montana) about a hundred kilometers away? If not, ...
0
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2answers
17 views

Confusion on Horizontal & Vertical Components of a Parabolic Motion

This was a question I found about projectile motion, the question was what's the bike's speed when it took off. Using $S=ut + 0.5at^2$, the time taken to reach the ground is $0.505 s$, they used ...
1
vote
2answers
31 views

How do I determine the components of a cinematic jump, for vertical and horizontal velocity?

I have been tasked with determining the feasibility of The Rock's jump in the movie 'Skyscraper' I am using projectile motion equations to determine it, but have gotten stuck whilst calculating my ...
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0answers
40 views

Why do 2 objects, when dropped, reach the ground at the same time? [duplicate]

2 objects of the the same volume and dimensions but with different weights are dropped from a sufficient height in which said objects can reach terminal velocity. Galileo's finding was that both ...
1
vote
2answers
151 views

Locus equation of a projectile in terms of $\tan\theta$

This is the locus equation of a projectile projected from the ground at an angle $\theta$, with an initial velocity $u$ : $$ y = x\tan\theta - \frac{gx^2}{2u^2\cos^2\theta} \tag{1} $$ I just read ...
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1answer
40 views

Can radar detect dumb bombs in freefall mode? [closed]

Can gravity bombs dropped from an aircraft be detected by radar and intercepted with a missile to prevent detonation on ground impact? Is there currently such a system? Edit: Its a military/defence ...
0
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0answers
13 views

The effect of mass on the optimum angle of a projectile, taking into account air resistance

I know that air resistance causes projectiles to have an optimum angle that is below 45 degrees, however, when we compare projectiles of different masses, for example a golf ball and a ping pong ball, ...
0
votes
1answer
36 views

Is gravitational force different from centripetal force in projectile motion?

This has always confused me, in a projectile motion, like a cannon shooting an object, the only force acting on the body is gravitational force, which is facing downwards or more precisely, ...
0
votes
1answer
20 views

Throwing a projectile down towards the ground at a larger downward angle

Suppose a particle is projected initially at speed $u$ downwards towards the ground at an angle $\alpha$ beneath the horizontal at a point $P$ above the ground. Let $O$ be a point on the ground, ...
0
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1answer
31 views

Applying one of the Kinematic formulas to a 2D projectile question failed [closed]

I started learning Kinematics for fun at Khan Academy, and so far it's quite interesting. Anyway, I was reading about 2D Projectile Motion, and was trying to solve the second example myself. You can ...
48
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2answers
9k views

How do we get supersonic bullets?

I recently answered a question on the WorldBuilding forum about grenades and bullets. One of the things that came up was that I argued smokeless powder in a rifle round could detonate, but was ...
0
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1answer
44 views

Resistance in fluids

Is atmosphere depth important in reaching terminal velocity in terms of slowing down an object. For instance, if a meteor was dropped from height $h_1$, would it hit the ground with the same velocity ...
0
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3answers
51 views

Velocity and theta sign [closed]

I'm doing the following problem: A castle on a cliff has a cannon 300m above sea level. The cannon can shoot a 10kg iron ball with a velocity of 400 m/s . If the cannon is raised to an angle ...
-2
votes
2answers
53 views

Why is my height negative if I'm pointing upwards?

I'm solving this typical problem of finding the height I have to aim my crossbow in order to get to a distance. The maths are OK but since gravity is negative my height is also negative. What am I ...
0
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0answers
28 views

Measuring Impact Force

My daughter is doing a project for school measuring the difference in impact force in softball with a mask vs without a mask. The systems I've looking into purchasing cost $1000. Please advise on how ...
0
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2answers
57 views

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

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
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0answers
45 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 ...
1
vote
1answer
43 views

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

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?
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1answer
51 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
42 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
67 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
42 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
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0answers
44 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
56 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
33 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
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2answers
73 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
91 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
66 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
47 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
17 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 ...
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votes
1answer
41 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
896 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
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0answers
40 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
72 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
249 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
94 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
49 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
51 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
254 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
29 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 ...