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. J-dizzal

    Projectile motion velocity question

    Is the x component of the initial velocity equal to the velocity of the projectile at max height? v0cosθ0i = vmax heighti
  2. D

    Projectile Motion - Skier & Ramp

    Homework Statement A ski jumper acquires a speed of 119.0 km/hr by racing down a steep hill. He then lifts off into the air from a horizontal ramp. Beyond this ramp, the ground slopes downward at an angle of θ = 45 degrees. Homework Equations Assuming the skier is in free-fall motion after he...
  3. K

    Projectile motion of a fired cannon ball

    1. A cannonball is fired toward a vertical building 400 m away with an initial velocity of at 36.9° above the horizontal. The ball will hit the building in A. 4.0 s. B. 5.0 s. C. less than 4.0 s. D. more than 5.0 s. 2. If the cannonball in the previous question is fired horizontally from a...
  4. S

    Spring constant, find height of projectile

    Homework Statement A 48 gram dart is shot vertically upwards from a catapult with a spring constant of 350 N/m. The catapult is initially stretched from the equilibrium point by 21 cm. What is the height above the starting point reached by the dart?Homework Equations KE=PE, rearranging to find...
  5. W

    Projectile height formula based on distance?

    If a projectile shot from the ground were shot at a target located at a specified height above the ground, and would hit the target, is there a known formula to find the projectile’s height on its trajectory a specified distance (measured along the flat ground) from the target’s base or from the...
  6. A

    Projectile Force and Velocity?

    Hi guys, Please, someone can help me to solve some simple equations? I Need to shoot a projectile with 20 grams at 15 meters and 15°. So, I'm triyng to calculate the velocity and Force and what I will need to make this succesfull. My Calcs...
  7. M

    Projectile motion with air resistance

    Homework Statement This is a standard projectile motion problem, the mass is m, the drag is F_r = - alpha *v, where alpha is a positive retarding coefficient. The origin is the ground and at time t = 0 the horizontal and vertical velocities are positive a) Write down Newton's second law for...
  8. V

    Projectile Motion/ Air Resistance Question

    I actually have 2 questions that I am getting stuck on around the same point.. Question 1) An arrow with a mass of 80g is fired at an angle of 30 degrees to the horizontal. It strikes a target located 5 m above the firing point and impacts the target traveling at a speed of 20 meters/sec. If...
  9. nusaiba mustafa

    Projectile motion sample problems

    Can i get a link or numerical problems on projectile motion Actually its so confusing
  10. P

    Projectile Motion- Incline vs. Horizontal Surface

    Homework Statement Two identical metal blocks, H and A, are placed at equal heights on frictionless ramps as shown above. The blocks are released at the same time, travel down the ramp, and then slide off their respective ends of the table. Block H leaves the table from a horizontal surface...
  11. Glenboro

    Projectile Motion of a Cannonball: Calculating Velocity, Height, Time, and Range

    Homework Statement A cannonball is fired with a velocity of 125 m/s at 25.0° above the horizontal a) Determine the horizontal and vertical components of the initial velocity. b) Determine the maximum height the cannonball reaches in its path c) Determine the time it takes to reach maximum...
  12. M

    Projectile motion and SUVAT equations

    Attempting a projectile motion question where initial and final speed is given but angle of elevation isn't. Need to find an equation for the vertical distance H travelled. I got the right answer using v^2 = u^2 + 2as substituting s=H and a=-9.8. However the mark scheme states that this...
  13. N

    Optimal distance to accelerate projectile

    Hi! I am recently involved in a project with a friend. We are trying to build a mass accelerator and thus, I figured that I need to know the optimal distance to place the coils and the winds on the coil. My thought was that if we place the coils too close, the coils wouldn't accelerate the...
  14. Hesham Zwayyed

    Using accelorometer and gyroscope in projectile motion

    I'm working on a project to make a SmartBall that can detect the velocity(km/h) , spin(degrees per second) and flightpath(trajectory) of the ball using Intel Edison with the 9DOF block (LSM9DS0 : 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer) & the battery block, I'm reading...
  15. anandzoom

    Projectile motion sand bag drop

    sand bag is dropped...i can understand that vertical acceleration is 9.8m/s^2...so vertical velocity increases in a.p (9.8, 19.6... m/s)...but this book says horizontal velocity of sandbag is constant and same as that of hot-air balloon (i.e., 12m/s)...I think the horizontal velocity should...
  16. A

    What is the Optimal Position for a Spanner to Achieve Balance and Stability?

    The attached file contains a question my brother asked me solve. But this problem might have some problem of its own. I feel like every position of the spanner is a probable one. Can someone please help. p.s. i know the answer but avoiding giving it to avoid getting biased.
  17. J

    Re-entry Projectile Analysis Program

    Hi all: I'm writing a program based on simple re-entry physics and can't quite get the algorithm to match the theoretical results. A little background: The equations I'm comparing this to are derivations from the equations of motion and the Sutton-Graves equation for peak heat flux at the...
  18. J

    Projectile Motion: Minimum Velocity for Overcoming an Obstacle

    Homework Statement A projectile needs to be launched over a fence of width d, and height y. Find the minimum velocity needed. Homework Equations Projectile Motion etc.. The Attempt at a Solution [/B] x(t) = v0xt y(t) = -½gt2+voyt Setting: x(T) = L y(T) = h
  19. gracy

    Projectile from certain height

    Formula for time of flight in projectile motion is 2usin theta/g but I think it is only applicable for when object is launched from ground i.e in the case below But when it is launched from certain height this formula is no longer in use.
  20. gracy

    Typical projectile problem

    Homework Statement There is a projectile which is launched at point "o" and land at "B".It was thrown with 20m/s with angle of 53 degree.Take g=10 m/s^2 sin theta=0.8 and cos theta=0.6 Find the time at which magnitude of x component of velocity of projectile is twice the magnitude of y...
  21. bongobl

    Projectile motion trajectories differing from 45 degrees

    Hi guys, I am stuck with a problem here. First, It is given that for 2-dimensional projectile motion, a trajectory of 45 degrees will yield the greatest range. However, how do I show that angles that differ from 45 degrees by the same amount will yield the same range? For example, the range of...
  22. AlephNumbers

    Maximizing range of projectile on a wedge

    Homework Statement A greasy spud is launched off of the top of an infinitely large frictionless wedge. The angle that the wedge slopes down at is 30 degrees. Find the launch angle that maximizes the horizontal range of the spud.Homework Equations [/B] x = x0 + vxt + (1/2)at2 The Attempt at a...
  23. G

    Differential equations: applying force to projectile

    Homework Statement The following series of differential equations represents a projectile's path when solved (g=9.81): Modify this series of differential equations to account for an additional force F with vector components a and b acting on the projectile. Here is a sample plot of this...
  24. T

    Projectile Motion here then simulated in a different gravity

    So I'm working on an experiment where I do a projectile motion simulation here on Earth and want to know how it will fair in a low gravity environment such as in the moon with one common parameter in between, Force. Imagine, here on earth, I have a mass that I push up with a force(F) for it to...
  25. L

    Projectile Motion on a Slope: Calculating Distance Traveled

    Homework Statement An archer standing on a 15 degree slope shoots an arrow 20 degrees above the horizontal. How far down the slope does the arrow hit if it is shot with a speed of 50m/s from 1.75m above the ground? Homework Equations [/B] ##y = x##tan##\theta## - ##\frac{gx^2}{2v^2...
  26. N

    Projectile Motion- magnitude of final velocity

    Homework Statement Consider a cannon on a 50m high cliff. The cannon shoots a cannonball with an initial speed of 200m/s at an angle of 30°, causing the cannonball to land 41m away from the cannon. What is the magnitude of the velocity of the cannonball the instance just before it hits the...
  27. S

    Uniform Circular Motion and Projectile All-in-One

    Homework Statement \[/B] Joey spins a laptop then he releases it, at an angle. Assuming no wind resistance, the laptop (has a rubberized case) hits the concrete and drags across the concrete for 5.3 seconds. What is the coefficient of friction between the rubber and concrete and what distance...
  28. N

    Path of a Projectile in Polar Coordinates

    Homework Statement A projectile is launched from a mountain at a given angle and velocity (which is large). Using polar coordinates find the position of the particle at time t. I'm ignoring drag (for now). Homework Equations I tried using the polar kinematic equations...
  29. HueHue

    How Do You Calculate Time of Flight and Range for a Rocket Launched at an Angle?

    Homework Statement A rocket is launched at an angle of 36.87º (sin=0.6 cos=0.8) with an acceleration of 30m/s² for 20s (fuel runs out). Find a) total time of flight b) horizontal range. Homework EquationsThe Attempt at a Solution for the first 20 seconds: v= 30 * 20 = 600m/s d=30 *...
  30. V

    Projectile motion, finding initial speed

    An object fired at an angle of 30° above the horizontal takes 2.5 s to travel the last 12 m of its vertical distance and the last 10 m of its horizontal distance. With what speed was the object launched? (Note: This problem does not stipulate that the initial and final elevation of the object...
  31. C

    Projectile motion finding distance

    Homework Statement King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, 12m above the moat. The rock is launched at a speed of 27m/s and an angle of 39∘ above the horizontal. How far from the castle wall does the launched rock hit the ground...
  32. T

    Height and horizontal distance of a projectile

    1. The problem: I need to find the height and horizontal distance reached by a projectile given only the vertical and horizontal velocities. Vv=120m/s Vh= 30m/s this is for an algebra based physics class, I'm very new to this stuff.Homework Equations : V=at+Vo X=1\2at^2 + Vo + Xo...
  33. J

    Projectile on Inclined Plane: Finding Angle of Inclination

    Homework Statement A projectile is thrown from a point A on an inclined plane field of unknown slope α, and hits the field on a point B. We know the angle between the initial velocity and the field: θ. We know the magnitude of the velocity: V. We know the the acceleration of gravity: g. We...
  34. C

    Finding initial velocity of a projectile

    Homework Statement A football is kicked at an angle of 60 degrees to the horizontal and travels a distance "R" before hitting the ground A.) find the initial speed of the football Homework EquationsThe Attempt at a Solution : [/B] I would presume I would need to find initial velocity of X...
  35. Femme_physics

    Calculating Projectile Motion for Cannon and Window Scenario

    Homework Statement A cannon has to fire a ball through a window in the wall. The window is 10 meters at the Y axis, and 8 meters (away from the cannon) at the X axis. The window is just slightly bigger than the ball (let's suppose that the dimensions are negligible). Find the required launching...
  36. M

    Solving Projectile Motion Problems: Intersecting Balls at Different Heights

    Homework Statement The top of a 10-storey building (42 m) , someone throws a ball (A) down with a initial speed of 2.5 m / s. You are on the second floor (8 m window above the ground) and You throw a ball (B) upward with an initial speed of 22 m / s. a) If both balls are thrown together after...
  37. J

    Projectile motion basketball ball shot help

    Homework Statement So I am given the height of a basketball player (2.00m tall) and the height of a basketball net (3.05m tall) and the distance at which the player stands from the net (10.0m away). The player shoots the ball at an angle of 45.0 degrees. What must the initial velocity be to...
  38. S

    Projectile (Which Statements are true?)

    Hi everyone, , I just want to make sure if I have done the statements right. Thank you. :)
  39. H

    Find unknown angle of Projectile

    I don't need the solution solved for me, but I need help with the method to find the solution. 1. Homework Statement A projectile is launched from an unknown angle and expected to hit a target at a lower altitude. The values given are the initial velocity, and the distance of the target from...
  40. Elvis 123456789

    Projectile Motion balloon question

    Homework Statement A 124-kg balloon carrying a 22-kg basket is descending with a constant downward velocity of 23.5m/s A 1.0-kg stone is thrown from the basket with an initial velocity of 14.8m/s perpendicular to the path of the descending balloon, as measured relative to a person at rest in...
  41. C

    Projectile launcher theory. ideas?

    Heres a design I put together a year ago and it got figured out to the point i might be able to make a prototype. What are some design flaws you guys might be able to point out, or some advice you think I could use.
  42. B

    Differential equations and escape velocities

    Homework Statement Good day all! I'm stumped on a question: If I fire a bullet straight up what will be the initial velocity such that the bullet doesn't come back down? I need to model a differential equation (it will be first order) some how! Also, Gravity is not constant, but rather, the...
  43. W

    Finding the initial velocity and time period of a projectile

    Homework Statement In the Fig. What should be the initial velocity (magnitude and direction) of the arrow? Also calculate the time of flight. Homework EquationsThe Attempt at a Solution I have formulated 2 equations: v*cos(theta) * t = 20 and 3 = (v * Sin(theta) * t) + (9.81 * t^2)/2 when...
  44. B

    Grade 12 physics projectile concept question

    I had a physics lab that is introducing Potential and Kinetic energy into are unit on projectiles. The first question was solve for the impact speed of a projectile launched horizontally at a 13m/s, this impact speed is -14.36m/s. The next question was find the impact speed of the same...
  45. M

    Projectile motion- solve for initial velocity

    Homework Statement A ball is thrown upward at an angle of 30degrees to the horizontal and lands on the top edge of a building that is 20m away. The top edge is 5.0m above the throwing point. How fast was the ball thrown? Homework Equations x=v0t+(1/2)at2 vf2=V02+2ax vx=v0cosθ vy=v0sinθ The...
  46. Poetria

    Maximum kinetic friction-combined with a projectile problem

    Homework Statement A cannon at ground level is shooting emergency packets to people stranded on the roof of a flooded building of height H=125 meters. The corner of the building is located a distance D=50 meters from the cannon. It is desired that the incoming packets are flying tangent to the...
  47. W

    Calculate the Pitch of a projectile with moving destination

    Hi all. I am not quite sure if this is the right forum to place this question but for me there are several forums that would fit with my situation :D I am making a game where I have to throw/shoot a projectile through a 3 dimensional space which has to land on a specific object. There are...
  48. G

    Proportions Projectile Motion Problem

    Homework Statement A projectile on level ground is launched with a certain speed vi and has a downrange distance of Δx. What is Its new downrange distance if it is launched with a speed of 4vi instead? Homework Equations Δx=vi*t (I think) The Attempt at a Solution Since it says speed in the...
  49. R

    Horizontal Projectiles. Degree or Radian mode in calculator?

    Homework Statement It's a worksheet with questions like : A pelican flying along a horizontal path drops a fish from a height of 5.4 m. The fish travels 8.0 m horizontally before it hits the water below. What is the pelican's initial speed? Homework EquationsThe Attempt at a Solution [/B] So...
  50. R

    Acceleration question -- Deceleration of a baseball being caught by a player

    1. A baseball is traveling at +18 m/s and is caught by a player. The ball is brought to rest in 0.5 s. What is the acceleration of the ball?Homework Equations Maybe vf=vi+ at ?The Attempt at a Solution This is under a Horizontal Projectiles worksheet by the way...I'm not sure what to do on this...
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