What is Projectiles: Definition and 195 Discussions

A projectile is any object thrown by the exertion of a force. It can also be defined as an object launched into the space and allowed to move free under the influence of gravity and air resistance. Although any object in motion through space (for example a thrown baseball, kicked football, fired bullet, thrown arrow, stone released from catapult) may be called projectiles, they are commonly found in warfare and sports. Mathematical equations of motion are used to analyze projectile trajectories.

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  1. B

    Projectiles launched at an angle, neglecting air resistance

    Homework Statement 2 Problems that I am unable to solve: 1.) projectile launched at an angle 35 degrees, just clears a wall 20m high at a distance of 130m from launch. Solve for initial velocity, time it takes the projectile to reach the wall, and the velocity components + speed of the...
  2. F

    When/where will two projectiles converge

    Homework Statement Two projectiles, projected at the same time with the following attributes: Object 1: Traveling 7 feet/per sec, accelerating -.25 feet/per sec Object 2: Starting projected position is 80 feet ahead of object 1, traveling 4 feet/per sec, accelerating -.45 feet/per sec. How...
  3. Gannet

    How fast are the projectiles from a supernova?

    I was wondering for the majority of the projectiles from supernova what would be roughly their velocities. Has anything been determined or theorized? Thanks in advance
  4. R

    Projectiles question: acquiring initial velocity from force+mass

    Hello, this may be a rather simple question but it's beginning to irritate me: If I were launching a marble of, say, 10g (0.010 kg) from a marble launcher with a force of 5N (tell me if this is realistic or not) at an angle of 15 degrees then how would I go about finding the initial velocity of...
  5. A

    Calculating the energy in projectiles from burst pressure vessels

    Hi everyone, I'm writing a safety case for pressure testing equipment using gaseous nitrogen (hydraulic pressure testing in this case is impractical) and I am trying to estimate the energy transferred to a projectile in the case of something bursting so I can sensibley mitigate against this...
  6. O

    What is the vertical acceleration of the projectile?

    Homework Statement Find the vertical acceleration of the projectile using the following points of data: y-axis: 33.37 32.87 31.72 30.02 27.8 24.8 21.05 16.7 11.85 6.5 0.6 each value is 0.10s from each other in the x-axis (a mark is was made on the plot every 0.1s) I...
  7. A

    Minimum distance b/w projectiles

    The problem is regarding two projectiles whose distance of separation is known.Their initial velocities and angle of projection are known, plus these angles are complementary and velocities are known to be equal.It is also known that the two projectiles do no colllide. We are required to find...
  8. J

    Question involving projectiles in motion.

    Homework Statement Now I'm pretty much an idiot, but the question to this is "Use information from the figure to find the initial speed of the grasshopper." Now I know that I need time, but this is where I'm having a problem. How would I calculate time without velocity. If I had some...
  9. W

    Projectiles and conservation of energy (water slide problem)

    Homework Statement The water slide shown in the figure ends at a height of 1.50 m above the pool. If the person starts from rest at point A and lands in the water at point B, which has a horizontal distance L = 2.58 m from the base of the slide, what is the height h of the water slide? (Assume...
  10. F

    Are AP Physics B Exam Projectile Problems More Complex Than Honors Physics?

    Hello guys. I remember some basic projectiles problems from Honors Physics last year, but I have a feeling they don't involve some of the same complicated concepts of projectiles problems that appear on the AP exam. This Friday my teacher is going to give the class a single question from I...
  11. J

    Solve Spring & Projectile Homework: Find d

    Homework Statement A spring haveing a force constant k is compressed a distance a frots its natural length, then used to launch an ice cub of mass m up a ramp of length l oriented at an angle theta to the horiaontal. The cube starts form rest at ground level, slides without friction up the...
  12. L

    Projectiles Problem - hardest physics problem I have ever faced

    Ok, here are the last 2 problems of my practice packet. I honestly, have no clue on the face of Earth how to even get started. If someone can guide me through a procedure. Tell me what to do, I can complete it myself. Honestly right now, i have no clue how to even start this problem. There are 2...
  13. C

    Projectiles, 2D Motion, displacement and average velocity

    Homework Statement A bird watcher meanders through the woods, walking 0.30 km due east, 0.65 km due south, and 2.25 km in a direction 37.0° north of west. The time required for this trip is 3.00 h. Determine the magnitude and direction (relative to due west) of the bird watcher's (a)...
  14. C

    Projectiles, 2D Motion, Bullet falling

    Homework Statement From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.48 m, and x = 6.0 m.) Using...
  15. J

    Looking for in-depth book(s) about the physics of projectiles?

    Hi, I am currently on the 3rd year of a 4 year physics degree, and I have a project for the semester entitled "The Physics of Projectiles". I am in need of suggestions for textbooks where I can get some good info on this topic. It is going to involve making things like catapults, crossbows...
  16. S

    Determine Initial Velocity of Rocket: Range 300 km, Height 100 km

    The question is A rocket has the range of 300 km and the max. height of 100km. Determine the initial velocity. How do I figure this out? I know you have to find out vertical and horizontal componets but I don't think I know how to do that.
  17. M

    Projectiles in rotating frame help

    Homework Statement At apparent latitude 45◦N a shell is fired due North at an inclination of 45◦ to the horizontal with initial speed V . Show that, neglecting the curvature of the Earth, the shell will hit the ground at a point a distance \frac{2 \omega V^3}{3g' ^2} East of the line of...
  18. L

    Projectiles and the Kepler problem

    Homework Statement Within the gravitational field produced by a celestial body of mass M we want to send a projectile of mass m from (x1,y1) to (x2,y2). The M mass is placed at the origin of coordinates. If the flight time is T, what is the initial velocity vector that we have to give to the...
  19. X

    Help with Projectiles shot horizontally problem

    I am in an introductory physics class and doing one of these problems, and though it probably isn't too difficult it has stumped me, mainly due to the fact that it asks for vi instead of d or something like that. Anyway, I'm just going to paraphrase the question: Suppose a basketball player...
  20. Mentallic

    Understanding of projectiles from physics

    I was unfortunate enough to have sports on the days of my mechanics classes so I've basically missed most if not all of the basics of this topic, and a test is coming up shortly. What I need is a crash course on this topic. Extension 2 mathematics (Australian high school) on mechanics...
  21. L

    How Fast Was Randy Barnes' Record-Setting Shot Putt?

    Q1. A world record for the shot putt of 23.12 m was set by Randy Barnes in Los Angeles in 1990. Estimate the speed at which the shot had to be projected to reach this distance, assuming that the shot was released at 45 degrees to the horizontal from a height of 2.2m above the ground. (The ground...
  22. D

    Force & Free Fall Projectile Homework Help

    Homework Statement 1)A 3.0kg chair at rest is pulled across the floor by a 20N force.If the co-efficient of friction between the floor and chair is 0.25, calculate: a)the net force on the chair. answer=13N b)the displacement of the chair after 2.0sm answer=8.4m...
  23. Q

    Rail guns for launching projectiles to space

    What can you say about using the rail gun technology, which works under the principle of electromagnetic propulsion, in sending projectiles to outer space? Is it possible in the mere future? How can it help our soceity?
  24. L

    Solving Projectiles: Kinematics Equations & Variables for Grade 12 Physics 12 BC

    Hi I am a grade 12 student in Physics 12 in BC, and I was wondering for projectiles, what equations you use, and what variables you use to solve. For example, in our notes our teacher gave us and example and completed it for us, but I don’t get why he used the equations he did. I do know that...
  25. P

    Physics 20-1 Final Review: Projectiles

    Homework Statement A student is standing on the top of a building and he throws an object into the air with a speed of 16 m/s at an angle of 25 degrees above the horizontal. If the building is 75 m tall, how far from the base of the building will the object hit the ground? Homework...
  26. P

    Physics 20-1 Final Review: Projectiles

    Homework Statement This question is something we got in our review booklet and I HATE projectile motion. An object is thrown horizontally with a velocity of 18 m/s from the top of a cliff. If the object hits the ground 100 m from the base of of the cliff, how high is the cliff...
  27. A

    Projectiles launched at an angle

    Homework Statement A baseball is hit over a 7.5-m-high fence 95 m from the home plate. What was the minimum speed of the ball when it left the bat? Assume the ball was hit 1 m above the ground and its path initially made a 38 degree angle with the ground. Homework Equations...
  28. A

    Projectiles launched at an angle not sure if i posted this already?

    Homework Statement A diver pushes off horizontally from a cliff 35 m above the water, and they must clear rocks that extend 5 m from the base of the cliff. (a)What minimum pushoff speed is necessary to clear the rocks? (b)How long are they in the air? Homework Equations for (b)...
  29. I

    How Do You Calculate Displacement and Time of Flight When Sliding Off a Roof?

    Homework Statement On a snowy winter day, you decide to slide off the roof of your home. The roof has an angle of inclination equal to 25.0 degrees. Given that you leave the edge of the roof with a velocity of 5.36m/s and the edge of the roof is 9.25m above the ground level. Determine...
  30. F

    Height, angles, and projectiles

    Homework Statement A spring-loaded gun can fire a projectile to a height h if it is fired straight up. If the same gun is pointed at an angle of 45 degrees from the vertical, what maximum height can now be reached by the projectile. 1. h _ 2. h / 2\/2 3. h / 2 _ 4. h / \/2 5. h...
  31. A

    Need help with projectiles launched at an angle

    Alright, I get how to get projectiles launched horizontally, but today our teacher wasn't even there and for some reason without going over the lesson he assigned us homework... so here I am. I just need to basicly know how to do this. I have 3 example problems from my homework. if you can do...
  32. G

    What is the maths behind projectiles (including air resistance)?

    E.g. A football of mass 1kg is thrown with a speed of 10m/s at an angle of 30 degrees from a horizontal plane. Take air resistance (in Newtons) as 1/15 th of the speed of the ball in the exact opposite direction that the ball is traveling. How long is the ball in the air? and how far...
  33. S

    What Is the Required Launch Angle to Clear a Wall in Projectile Motion?

    Homework Statement Suppose a very narrow, very tall wall of height H stands between two children who are trying to play catch. The wall is a distance x[SUB][wall] from the thrower, and the catcher is distance X[SUB][F] from the thrower. In this problem you will calculate the lunch angle...
  34. S

    Projectile Motion: Finding Distance to Clear a Wall

    Homework Statement A ball is thrown at 60deg with v(subzero) = 20 meters/sec to clear a wall that is 2 meters high. how far away is the wall? Homework Equations h=((v(subzero)*sin(theta))^2)/g The Attempt at a Solution I tried inserting my givens into the height equation and came...
  35. S

    How Is Time Calculated for Angle Reduction in Javelin Throw Projectile Motion?

    4.In the javelin throw at a track-and-field event, the javelin is launched at a speed of 30 m/s at an angle of 33° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to...
  36. P

    The Force Behind a Curve Ball: Spin and Projectiles

    The other day, my professor mentioned projectiles have a force on them due to their spin. The example he gave is how a baseball curves because of the spin of a curve ball. What's the name of this force?
  37. M

    Orbits & Projectiles: Why the Difference?

    Hello everyone, Why is it that in projectiles we learn that a mass launched horizontally will always fall towards gravity regardless of its horizontal velocity but in orbiting satellites this does not happen? Thanks!
  38. K

    Projectiles and effects on gravity

    Neglecting air resistance on Earth and regardless of how fast or slow a projectile's initial horizontal velocity is when fired from the same fixed height, they will all fall at the same time. Is this because regardless of the horizontal motions, the vertical motion is the same? Can someone clear...
  39. L

    Flight of projectiles from a rifle

    Hello all We at work have been discussing the flight of projectiles from a rifle. So here is the discussion. Firstly a rifle is fired at 500m to a target on a horizontal range. After some adjustment the centre is hit consistently. Termed a bulls eye. Then The target is placed on a hill...
  40. T

    Projectile Motion Problem: Finding Velocity Before Impact

    [SOLVED] Help With Projectiles Problem Homework Statement A car rolls down a slope at 30° to the horizontal, and reaches 40 m/s just before plunging off a cliff 180m high. What is its velocity just before hitting the bottom? Homework Equations U_H = vcos\theta U_V = vsin\theta...
  41. P

    How Does Gravity Affect the Trajectory of an Artillery Shell?

    Hey, I'm doing a math project on projectiles (I think) and I was wondering how to determine how let's say... an artillery shell would act after it leaves the barrel. I was wondering when the forces of gravity would overcome the initial propulsion force and begin to bring the shell down. I know...
  42. M

    Differential equation: projectiles

    Homework Statement A projectile of mass m is projected vertically upwards with speed U. In addition to its weight it experiences a resistive force mkv^2, where v is the speed at which the projectile is moving and k is a constant. Derive the equation of motion of the projectile: dv/dt =...
  43. D

    Can rotational force of the earth have any effect on flying projectiles?

    Well we know guys that the Earth spins to the east. So i was thinking, if you launch projectiles (lets say golf balls) of equal speed and angle to the east and launch some to the west, will the ones thrown to the east land farther from the launching point compared to the ones thrown to the west...
  44. E

    Solve Projectile Motion: Baseball Player Hits 180m Home Run with 21.3m Height"

    baseball player hit a home run that was estimated to have landed 180 m from home plate and to have reached a height of 21.3 m. a. how long was it in the air? b. what was the initial vertical velocity? c. what was the initial horizontal velocity? d. what was the initial velocity of the...
  45. E

    Projectiles 3D. Working with forces like wind

    Hello! I'm doing a research work about projectiles and i thought of crossbow system. I am currently studying using these articles: http://ciencia.hsw.uol.com.br/framed.htm?parent=crossbow.htm&url=http://www.stortford-archers.org.uk/medieval.htm and...
  46. H

    Basic Mechanics - Projectiles Q's having problems

    Homework Statement In a film stunt a car is driven over a cliff at 15ms^-1, the ground at the top of the cliff being level. The wreckage is 45m horizontally from the foot of the cliff. What is the vertical height that the car has fallen? Homework Equations Im not sure but I am...
  47. K

    Projectile Problem Help: Find Maximum Distance and Collision Point - g=10m/s2

    1. A ship is approaching a cliff of height 105m above sea level. gun fited on ship can fire shots with 110m/s. Find the maximum distance frm the foot of cliff from where the gun can hit an object on the top of cliff. g=10m/s2 2. 2towers AB and CD are situated a distance 'd' apart. AB is 20m...
  48. G

    Supposedly very easy questions dealing with projectiles, equilibrium, etc.

    please help me with these problems! even if you only have time to do one, i'd really appreciate it! A ball is thrown with an initial speed of 15 m/s at an angle of 53 degrees above the horizontal from the top of a 35 m building. if g = 9.8 m/s^2 and air resistance is negligible, then what...
  49. H

    What are some tips for understanding projectiles in physics?

    Hi there, I am doing physics as level and i am finding it very difficult especially the projectiles. I am unable to say when u=0 or v=0 and i am not sure how to analyse the situation vertically and horizontally! Some one please suggest me a good revision guide. I am following the edexcel...
  50. A

    Projectiles launched at an angle.

    Homework Statement In 1991, Doug Danger rode a motorcycle to jump a horizontal distance of 76.5m. Find the maximm height of the jump if his angle with respect to the ground was 12.0?. Homework Equations Initial Velocity= ?g?x/2(sin ?)(cos ?) ?t= ?x/vi(cos ?) ?y= vi(sin ?)?t+1/2g(?t)^2 The...
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