What is Projectile: Definition and 1000 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. A

    Aeroplane Projectile Homework: Determine Velocity

    Homework Statement A windscreen is dirty and a bird dropped something which hits perpendicular your windscreen (Which has an inclination angel 40°). By comparison with the height of your house you know the flight height of the bird quite well. 10 m above your car. Determine the Horizontal...
  2. CaptainSensible

    Projectile Motion Equation Problem

    Hi Everyone, I hope someone can help me, I am attempting this projectile problem, but I keep coming unstuck. Could anyone point my in the right direction? I have attempted to break down the initial velocity into its component forces etc, but as I do not know the initial velocity, final...
  3. Q

    How to find initial velocity without being given time

    Homework Statement a projectile is launched at an angle of 26.5 above the horizontal at a height of 1.11m. the range is 2.331m. find the initial velocity and time given that acceleration due to gravity is 9.8m/s^2. The Attempt at a Solution first, I split the velocity into its components...
  4. J

    Stone being tossed from mountain Uni Physics with Calc

    Homework Statement A stone is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of 45◦ . With what speed was it thrown? Homework Equations g=9.8 projectile motion is symmetric The Attempt at a Solution I got the answer 277.539 by treating this is a...
  5. 2

    Projectile Motion With Unequal Launch And Landing Height

    Homework Statement Below is screen shot of the problem. My friends book was ripped so some of the problem was cut off. Using the diagram I need to find d. The answer is supposed to be 7.42x10^4m. Below the problem is my attempt at the solution. Can someone tell me where I went wrong. As you can...
  6. joeyoung1996

    Kinematics Projectile Motion Problem

    Homework Statement A ball launched from ground level lands 2.85s later on a level field 48 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ignore any effects due to air resistance.) Homework Equations...
  7. S

    Projectile Motion: How tall is the building?

    Homework Statement A ball thrown horizontally at 12.4m/s from the roof of a building lands 20.2m from the base of the building. How tall is the building? Homework Equations I think I'm supposed to use these: horizontal motion: x=x0+vx0t vertical motion: y=y0=+vy0(t)-.5at^2 The Attempt at a...
  8. Archit

    Help me calculate the speed of the basketball

    Here is the picture for you to understand it better. Please help me calculate the velocity required for the ball. I have already tried it with the formula: displacement = initial velocity(time) + (acceleration)(time2)/2 but cannot since I do not know the initial velocity and the time Please...
  9. Archit

    How do you put force in a projectile equation

    Hi. I need to put the formula F=ma into the projectile formula displacement =(initial velocity)time+acceleration(time2)/2 I've already tried it but can't. Please help me Thanks.
  10. RJLiberator

    Assumption about Projectile Motion in this Question

    Homework Statement A test rocket is launched, starting on the ground, from rest, by accelerating it along an incline with constant acceleration a. The incline has length L, and it rises at theta degrees above the horizontal. At the instant the rocket leaves the incline, its engines turn off and...
  11. T

    Mastering Projectile Motion Equations: A Comprehensive Guide

    I was recently doing a few projectile motion equations and noticed that the formula used changes depending on whether or not a given initial position. Am I correct, or am I misinterpreting the situation and manipulation of the equation? Also, can someone provide a file or pdf for all the...
  12. P

    At what angle do you shoot a projectile so height=range?

    And does the answer depend on gravity? In other words would it be the same angle on the moon?
  13. D.Man Hazarika

    Projectile problem -- How much to increase Vi to reach a farther target?

    Homework Statement A missile is launched from the ground making 45 degree with the horizontal to hit a target at a horizontal distance of 300 km. If it is required to hit a target at a horizontal distance of 675 km launched at same angle with horizontal, find the percentage change in its...
  14. R

    Projectile motion of a flying object

    Homework Statement an object is thrown horizontally off a cliff with an initial speed of 7.5m/s. The object strikes the ground 3 sec later what is the horizontal velocity after 1.5 sec Homework EquationsThe Attempt at a Solution i don't know how to start this problem without an angle given
  15. Feodalherren

    Kinematics - projectile with acceleration that depends on V

    Homework Statement A ship is traveling across the sea when its engines are cut. The ship slows down by a = -kV2. The ship gradually slows down from 5 knots/h to 12 knots/h over 20min. Determine the distance traveled in nautical miles. One knot is 1 nautical mile per hour.Homework Equations...
  16. R

    Projectile Motion in an Electric Field

    Homework Statement In the figure, a uniform, upward-pointing electric field E of magnitude 5.00E3 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm (0.04 m) and separation d = 2.00 cm (0.02...
  17. T

    Projectile motion -- launched 60° above the horizontal

    Homework Statement A projectile is launched at an initial speed of 30 m/s at an angle of 60° above the horizontal. Calculate the magnitude and direction of its velocity (a) 2s and (b) 5s after launch Homework Equations x=v*t in the x dimension x= x+vt+(1/2)at^2The Attempt at a Solution I...
  18. R

    Why is my answer wrong? Projectile Motion

    Homework Statement An airplane with a speed of 70.6 m/s is climbing upward at an angle of 40.0 ° with respect to the horizontal. When the plane's altitude is 814 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...
  19. A

    Projectile question with no time or velocity or range

    Homework Statement A fly ball just clears a 10.0 meter fence on the way down at a 45 degree angle, and strikes the ground 8.0 meters beyond the fence. Calculate the speed of the ball when it left his bat (at ground level). since it lands at ground level dy=0 a=9.81m/s2 since it is the only...
  20. A

    Projectile Problem: Find y, vy0, vy Impact, & Velocity Mag/Dir

    you launch a projectile with an initial velocity of at an angle of 30 degrees and it hits a target .4 secpmds after it is launched at a horizontal distance of .4m a. what is the y coordinate of the target b. what was its intial velocity c.what is the y- components of it s velocity just before...
  21. A

    Supposedly easy physics problem =( [projectile]

    You launch a projectile with an initial velocity of 4 m/s at an angle of 60 degrees and it hits a target at a distance of 1.0 m in the horizontal direction. a. what is the y coordinate of the target b.how long does it take for the projectile to hit the target c.what is the y- component of its...
  22. C

    Accelerating projectile force needed

    Homework Statement I need to accelerate a 0.2 gram projectile to 300 m/s within 80cm. How much force (N) do I need? Homework Equations E = F * S The Attempt at a Solution
  23. C

    Projectile acceleration in barrel

    Another gun-related question: I'm building a pneumatic airgun and I'm trying to find out what pressure/barrel length I have to use for a given muzzle velocity. I've done a bit of number crunching but I keep coming up with insane barrel lenghts, and that's not even considering any friction...
  24. F

    Help! Physics Problem: Find Theta for 1000m Target

    http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=4836&context=ujmm Ive been awake for thirty six hours and I don't know differential equations. Im trying to find the angle (theta) over the horizontal axis that is needed to hit a target that is 1000 meters away they are basically...
  25. J

    Projectile Motion Using Conservation of Energy

    Homework Statement Exam review question concerning 2 dimensional motion, the professor did not hand out an answer key and I am just looking for an answer check. A car launches at an angle of 30 degrees above the horizontal, off a cliff (50m), moving at an initial speed of 10m/s. Find the...
  26. S

    Projectile Motion: Calculating Initial Speed for Arrow at 30° Angle

    1. An arrow is shot upward at a 30 degree angle compared to horizontal in order to hit a target that is 100 meters away. What was the initials peed of the arrow if it hits the center of the target?2. This is the hardest question on my sheet, can someone please walk me through how to do it?3...
  27. M

    How do you do projectile calculations, but with drag force?

    And how do you find the drag force?
  28. S

    Projectile Motion - Solving for initial velocity w/o time

    Homework Statement A motorcyclist wants to jump 20 cars placed side-by-side, making the jump 30m long (coming back to the initial height). Assume that the ramp is placed at an angle of 30 degrees from the horizontal. a. Calculate the initial velocity required to make the jump. b. Assuming the...
  29. E

    Projectile Motion of a Football Problem

    Homework Statement A football is kicked from the ground toward a 3.2 meter tall goal post 30 meters away. The ball leaves the ground with a velocity of 18 meters/sec at an angle of 50 degrees from the ground. How high off of the ground is the ball when it reaches the goal post? Does the kicker...
  30. gracy

    Projectile motion helicopter

    A helicopter on a flood relief mission flying horizontally with a speed vo at an altitude H, has to drop a food packet for victims standing on the ground. At what 'distance from the victims should the food packet be dropped'?the victims are standing in the vertical plane of the helicopter. In...
  31. T

    Projectile Motion ball is launched

    Homework Statement A ball is launched with initial speed ##2\sqrt{}gh## such that it just clears two walls of height 'h' separated by a distance 2h .What is the time taken by the ball between the two walls ? Ans: ##2\sqrt{\frac{h}{g}}## Homework EquationsThe Attempt at a Solution...
  32. B

    What factors affect the trajectory of a soccer ball in projectile motion?

    Homework Statement A soccer ball is kicked 27.43m away from the goal and 9.15m away from the defensive line with a initial velocity of 36 m/s, when the ball reaches the goal is 1.92m from the floor [/B] I'll leave a little diagram of the problem, thanks for your time. P.D: I apologize for my...
  33. M

    Projectile motion with a few variables

    Homework Statement Assume uniform acceleration. The projectile is released at a height 1m above the ground traveling at angle 60 above the horizontal. It hits the ground 60m away from the launch position. Calculate acceleration of the particle in acceleration phase.[/B]Homework Equations...
  34. J

    Projectile Motion: Finding the Angle

    Homework Statement A toy gun uses a spring with a force constant of ##\small{300 N/m}## to propel a ##\small{10.0\!-\!g}## steel ball. If the spring is compressed ##\small{7.00\ cm}## and friction is negligible: At what angles above the horizontal may a child aim to hit a target...
  35. B

    Need Help Projectile Motion - Hitting Target with toy gun

    Hey, I need help with a lab I'm doing in class. The goal is to hit a target on the ground by shooting a bullet from a toy gun. Our distance from the target will be assigned to us by our teacher and I need to calculate the initial velocity of the gun and then hit the target by only changing the...
  36. L

    Displacement in Conversation of Energy on Incline vs Projectile

    How come when I do a conservation of energy up an incline the displacement is the distance up the incline, but when I do a conservation of energy from a projectile the displacement is not the resultant of the x and y displacements (instead, it's only the displacement in the y-direction)? Thank-you
  37. E

    Projectile angle that considers canon length

    Greetings, Most projectile problems are presented from the muzzle of a cannon; however, how do we solve the problem if the velocity is known at the muzzle; but the angle is controlled at the base of the canon. The issue is that, when the canon angle changes, so does the muzzle location! The...
  38. Smit

    Shape of Projectile: Elliptical Equation

    Can we derive the equation of a projectile to be elliptical.
  39. Y

    Projectile Motion: Method of finding initial velocity in a lab

    Homework Statement Determine the exit speed(initial velocity) of a marble exiting a launcher shot from a table. The height of the table, distance of the x component and the time can be measured. t=? Vi=? Vix=? Homework Equations d= vi * t + 0.5*g*t^2 Vi^2=Vix^2*Viy*2 The Attempt at a Solution I...
  40. G

    How Far Does Dave Johnson's Center of Mass Move Up During the High Jump?

    Dave Johnson, the bronze medallist at the 1992 Olympic decathalon in Barcelona, leaves the ground at the high jump with vertical velocity component 6 m/s. How far does his center of mass move up as he makes the jump?
  41. A

    Calculating Time and Distance for a Tram with Sinusoidal Velocity

    Homework Statement The velocity of a tram traveling on a straight line between two stops is given by: v = 16sin(pi(t)/30) m/s find the time lapse between stops the distance traveled between stops the maximum velocity of the tram and when it occurs Homework Equations Displacement = x...
  42. A

    Simple projectile motion question

    Homework Statement A missle is fired vertically up from a ground with an initial velocity of 20m/s. The acceleration at any time is given by dv/dt = -10 + t/2 m/s^2. Find the height of the missile after two seconds Find the height after four seconds the direction the missile is traveling when t...
  43. K

    Projectile Motion: Deriving 2g^2

    Homework Statement Show that for a projectile d^2 (v^2)/dt^2 = 2g^2 Homework EquationsThe Attempt at a Solution Since we are only dealing with the y component for this. 2nd derivative would be 2. But since gravity acts on it then d^2 (v^2)/dt^2 = 2g. I don't get how to get to 2g^2. Can someone...
  44. A

    Projectile Motion - Time in Air

    Homework Statement What angles should an arrow be launched if it leaves the bow @ speed of 60 m/s and is trying to hit a target that is 150 m away? Assume target is same height as bow. Suppose the arrow is fired at an angle of 30 degrees & misses the target & hits the ground 1.8 m below from...
  45. D

    What am I doing wrong? Simple Projectile motion calculations.

    Ok, I have used every calculator I can find, typed it in several different ways for the past three hours and at this point I am giving up and asking for help. 1. Homework Statement A rock is thrown from the edge of a 14 meter high cliff with a velocity of total magnitude of 7m/s. Find the...
  46. PsychonautQQ

    Deriving projectile motion result

    Homework Statement A gun can fire an artillery shell with a speed v_0 in any direction. Show that a shell can strike any target within the surface given by: (gr)^2 = (v_0)^4 - (2gz)*(v_0)^2 where z is height and r is horizontal distance the target is from the gun. Homework Equations Some...
  47. M

    Cube Projectile Motion: Air Resistance & Cross Sectional Area

    We have a solid cube with some mass that we fire as a projectile at some angle. The cube is launched in such a way that two of the faces are perpendicular to the initial velocity vector. Assuming there is air resistance, would the cube change its orientation while it flies, even if the mass is...
  48. L

    Need help on this projectile motion problem

    Homework Statement A cannonball is fired from the top of a sheer cliff that towers over the valley fllor below. The angle of the initial velocity is 20 degrees above the horizontal. The cannonball remains in the air for 3.50 seconds before hitting its target on the valley floor, a distance of...
  49. F

    Calculating force from distance traveled and initial speed of projectile

    Homework Statement Estimate the average force exerted by a shot-putter on a 7.0-kg shot if the shot is moved through a distance of 3.0m and is released with a speed of 10m/s . Homework Equations F=ma Maybe the Five Equations for constant acceleration? The Attempt at a Solution So my guess is...
  50. C

    Finding the angle of the velocity vector of a projectile at moment of impact

    Homework Statement A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 16.0 m/s. The cliff is h= 41.0 m above a flat horizontal beach h=41 g=10m/s vi=0m/s vf2=vi2+2gh vi=28.64 h=vi+vf/2xt 41=28.64/2xt 14.32 t=2.86 28.64x28.64, 16x16 Square...
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