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Questions tagged [projectile]

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

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Is Verlet method suitable for to solve projectile motion with quadratic drag?

Consider the following non-dimensional equations of projectile motion in presence of air resistance, I understand it can be numerically solved using the mid-point method, but can I also use Verlet ...
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1answer
48 views

Projectile with air resistance from a given hight

Objects take same time to fall a given height independent of their horizontal speed when air resistance is ignored, is this also true when air resistance is not ignored? In presence of air resistance, ...
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1answer
28 views

Maximum distance of a body in projectile motion from origin [duplicate]

Suppose a body is in projectile motion then what will be the maximum distance it can attain from origin? Also in what case the range will be the maximum distance from the origin compared to other ...
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Horizontal Free Fall

Let's say you are launched out of a canon at a $0^\circ$ degree angle 5 feet off of the ground. Normally, from my basic understanding of free falling, you have to be move unimpeded with no force ...
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5answers
98 views

Couldn't you use a spring to increase energy?

When I was a kid I had a BB gun and when it was cocked it would compress a spring, then when you pulled the trigger, the spring would be released and fire a BB out at high velocity. I was thinking, ...
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1answer
46 views

How did Carnevale et al. could argue mass in a ballistically aggregating systetm evolves as $t^{2d/(d+2)}$?

I am trying to understand this paper but I am not able to do it. Please help. See the paper here. First of all how could they write collision time $t_0$ as given there?. I am not able to get it even ...
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0answers
29 views

Which bench will be hit a ball projected at an angle (benches are at different heights)? [closed]

Question: The benches of a gallery in a cricket stadium are $1$ $m$ wide and $1$ $m$ high. A batsman strikes the ball at a level $1$ $m$ above the ground and hits a mammoth sixer. The ball starts ...
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0answers
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Charge projectile emanating Electric field [closed]

Two point changes +q and -q are separated by distance d .A particular electric field line emanating from charge +q at an angle of 60° attains maximum height h above line AB as shown. IF h = ((√x.)(d))/...
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80 views

What should be the speed of my bullet be to punch a nice round hole through a paper sheet?

If my bullet travels faster will the amount of damage done to the paper be lesser? Due to inertia of the paper can the bullet make bullet shaped holes instead of making a big hole as the speed ...
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4answers
121 views

Can we do a thought experiment to prove that the horizontal and vertical motion of a projectile are independent of each other?

It seems really hard for me to grasp the idea that horizontal and vertical motion of a projectile are independent of each other. Intuitively I feel that they should affect each other. How can it be ...
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2answers
43 views

Do faster moving projectiles make larger penetration holes? [closed]

When it comes to shooting guns, a bullet of a certain size will make a certain size hole in the paper or wood target. A $.22$ bullet makes a pea size hole regardless of if its shot out of a pistol ...
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1answer
68 views

Projectiles with unequal initial velocities, purely horizontal

If projectiles $A$ and $B$ are projected horizontally with different initial velocity from the same height, then both $A$ and $B$ possess the same vertical component of velocity, at any instant. ...
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7answers
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Why does the Earth follow an elliptical trajectory rather than a parabolic one?

I was taught that when the acceleration experienced by a body is constant, that body follows a parabolic curve. This seems logical because constant acceleration means velocity that is linear and ...
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1answer
67 views

The phase space trajectory of a single particle falling freely from height is? [closed]

The phase space trajectory of a single particle falling freely from height is? Phase space is a plot between momentum and position, and since kinetic energy increases the momentum must increase with ...
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5answers
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What happens when the drag force exceeds the weight of an object falling into earth?

Let's say a meteor is coming towards earth. It's not accelerating, but it does have an initial velocity. This meteor is shaped so it has an insane amount of drag, enough to even exceed its weight (not ...
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6answers
63 views

How is speed affected (or not affected) by acceleration by gravity?

I am a new physics student and I was reading a question posted on here earlier: Which Sphere is Fastest? It posits that three spheres thrown with the same speed at the same point (one thrown ...
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3answers
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Which sphere is fastest? [closed]

I was doing a physics problem, and it seemed simple at first, but now it doesn't at all, and I need help. Here it is. Three identical spheres are thrown from the same height above the ground. Sphere ...
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0answers
62 views

Bouncing of tennis ball [duplicate]

Some one posted this question but didn't give the entire details. I request that any one with the question post it for me. Iam interested in the detailed question, in other words the first part of the ...
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3answers
101 views

Why can I throw a larger stone farther than a smaller stone?

Recently I was throwing stones(don't ask me why) when I noticed that there seems to be an optimum weight of stone so that it travels the farthest. If I generate the same amount of force each time(and ...
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2answers
50 views

Throwing/Dropping an Object

When we throw or drop an object while moving, do we impart it our acceleration or velocity or both? Say i throw a ball at 5 m/s (relative to me) while at say, 30° to my direction of motion, then will ...
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0answers
27 views

Is Bernoulli's equation the correct explanation of a curved soccer ball? [duplicate]

I saw a lot of materials supposing that the Bernoulli's equation explains the curvature of a soccer ball: since the ball is spinning, two sides of the ball would experience different velocities, and ...
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1answer
51 views

Why doesn't the coriolis force cancel out when a ball is thrown up?

The question is to calculate the lateral displacement of a ball due to the coriolis force once thrown up and allowed to come back down. The initial equation to work with is $\ddot{x} = -2\omega \dot{...
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At what speed in air would a solid object turn to plasma?

Just curious, friction can heat up what ever is moving. The faster something moves the quicker it heats up. Is it possible in the perfect scenario to turn a speeding solid object to plasma through ...
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0answers
41 views

Significance of differentiation of the equation of trajectory of a projectile with respect to different variables [closed]

The original question was: A fighter plane is flying horizontally at a height of 250 m from ground with constant velocity of 500m/s.It passes exacily over a cannon which can fire a shell at any ...
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2answers
72 views

Question About Gravity vs. Earth’s Rotation [duplicate]

If a bullet was fired perfectly straight up (assuming a windless environment) such that the peak of its trajectory was just shy of orbit, would it fall back to Earth in the same spot, or would Earth’s ...
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5answers
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Why do I get negative height?

A baseball is thrown from the roof $50.1^\circ$ above the horizontal. The initial velocity is $11.5\ \mathrm{m/s}$. I'm trying to find how high the ball goes. I choose positive direction upwards. $$...
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2answers
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Free fall ellipse or parabola?

Herbert Spencer somewhere says that the parabola of a ballistic object is actually a portion of an ellipse that is indistinguishable from a parabola--is that true? It would seem plausible since ...
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2answers
42 views

The force of wind on baseball

Does anyone know of an equation that I would be able to use for the force of wind acting upon a baseball? I am working on the projectile motion of a baseball with air and wind resistance. I have the ...
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0answers
38 views

Wind Force of a projectile

I am currently working on a program that models the projectile motion of a baseball with air resistance and wind acting upon it. However, I cannot find the equation to calculate the force of the wind, ...
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1answer
95 views

Can a projectile bullet kill? [closed]

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 ...
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3answers
102 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 ...
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2answers
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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 ...
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4answers
62 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 ...
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1answer
41 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. ...
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0answers
23 views

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

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 ...
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2answers
91 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, ...
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2answers
28 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 ...
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2answers
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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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2answers
171 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
45 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 ...
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0answers
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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, ...
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1answer
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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, ...
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1answer
23 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, ...
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1answer
38 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 ...
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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 ...
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1answer
45 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 ...
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3answers
52 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 ...
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2answers
57 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 ...
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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 ...
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2answers
61 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 ...