# Questions tagged [projectile]

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

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### Finding the angle required to hit a stationary target

Ignoring air resistace, I have that the height of our canon is $8.2$m and the height of the target is $6.34$m. And that our initial veocity $v_0=18$m/s. I have to determine a way to find the angle ...
44 views

### What equation should I use if I am estimating the distance of a rocket's landing point to the point it was launched from?

I am trying to figure out how to estimate how far (in meters) that a solid fuel model rocket will land from its launching point. To do this, I have figured out I will need to estimate the maximum ...
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### Doubt in resolved vectors in SUVAT equations

In the (ii) part of this question, I have used s = ut + 1/2 at^2 and also tried v = u + at In the answer, the velocity is taken as the vertical component of the velocity. Why is this? Why can't we ...
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### How to estimate time to fall with air drag and variable density?

I would like to estimate the time that it takes for an object to fall if it is there a quadratic drag force and a variable density. In a vacuum, the falling time $t_\mathrm{vacuum}$ has a simple ...
86 views

### How do I calculate where a solid fuel rocket will land if the rocket is launched at a 45 degree angle?

Let's say I was launching a model rocket at a 45 degree angle to find the distance between the rocket's landing site and the rocket's launching site, but before launch I wanted to try and calculate ...
33 views

### Minimum velocity required to reach the top of the rollercoaster using conservation of energy [closed]

A rollercoaster (assuming to be a point particle) is encountering a circular track of radius R. What is the minimum speed required for the rollercoaster to reach the top of the obstacle? Assume the ...
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### How does changing track diameter change ball velocity [closed]

For an experiment; A ball is rolled down a ramp and drops off a table The theoretical and practical horizontal distance of the ball is compared. Adjustments are made to reach the initial distance I ...
2k views

### What does “Just before” and “Just after” really mean in physics problems?

So I'm stuck in a dynamics problem that asks what is the acceleration of a body just after A, where A is the point that separates the motion of the body from a curvilinear path to projectile motion. ...
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### What does $d$ stand for in this formula?

Context: I am building a tennis ball machine and am having trouble interpreting the following formula for the flight path of the ball. I know all of the other values in the formula but the source I am ...
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### How much weight do I need to lose to grab the basketball rim?

I am 195 pounds, 71" tall, standing reach of 92”. Currently, I can jump to touch 115" in height (finger tips). I'd like to jump to 123" in. to grab the basketball rim. (Note: 10ft/120&...
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### Using air resistance (drag) in Python calculation

I am simulating a free fall with a function that needs to calculate the time it takes for a particular object to reach the surface, I got this program working without accounting for air resistance.. ...
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### Angle of releasing a pendulum and the speed of the ball hit by it

I have conducted the experiment. My independent variable is the angle of releasing the pendulum and my dependent variable is the speed of the ball that is hit by it. I know the following quantities: ...
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### Which cases $g$-force is negative $(g=-9.81m/s^2)$?

A stone was dropped into an empty well. It takes 10 sec to hit the ground. What was the velocity of the ball? So since I have to use the formula $v=gt$ I'm quite confused if g=$-9.81m/s^2$ or not? ...
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### Solving for Initial Velocity [closed]

A ball is dropped from the building 150 m high at the same instant a second ball is thrown upward from the ground. If the two balls pass each other at a point 60 m above the ground, solve the initial ...
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### Vertical+Horizontal Throw [closed]

From the top of a cliff, a stone is thrown vertically upwards with a speed of 21.8 m / s. From the same height, a second stone is dropped 3 s later. Both stones hit the ground simultaneously. Under ...
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### Relationship between payload weight to the range of a ballistic missile

is it possible to talk about how much extra range a ballistic missile gets if its warhead were to shrink by say 10x?? that is without knowing other details about the missile. For example: Iran claims ...
51 views

### Forces on a spinning ball

The drag force opposes the direction of velocity, and the lift force is perpendicular to both the drag force and the rotation direction. So if a tennis ball is rotating clockwise and moving to the ...
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### How is the energy dissipated by drag split between sound waves and turbulence?

Consider an object of radius $R$ traveling at a constant, slightly subsonic or supersonic speed through a homogeneous fluid, in conditions of very high Reynolds number. Because the object experiences ...
42 views

### Trouble with Equations for 2D projectile motion WITH air resistance? [closed]

My AP students are learning 2D kinematics, and it got me in the mood to play around with projectiles WITH air resistance, just for fun because we always neglect it, and so that I can maybe show them ...
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### How Would Projectile Motion Be Described in Non-Euclidean Space?

If I and a friend found ourselves in a world described by spherical geometry (as simulated in this linked video https://youtu.be/yY9GAyJtuJ0 ) how would the kinematics equations need to be augmented ...
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### Kinematics Physics Toy

A toy was rolled off the table at 10 m/s and landed 5 m from the table. The same car is rolled off the same table at 15 m/s. Would the time the car was in the air increase, decrease or stay the same?...
50 views

### Difference between horizontal and oblique projectile motion

I have been studying kinematics and I am stuck with understanding what is oblique projectile and what is horizontal projectile and what is the difference between them? Can someone please explain them ...
56 views

### How many forces are acting on a projectile when it is passing through the highest point in the trajectory if air resistance is ignored?

This is a projectile motion question and the question basically states that an object is launched at $45$ degrees with an initial velocity of $28m/s$ east. So, how many forces are acting on a ...
51 views

### Laws of motion and Forces [closed]

Explain with the use of equations why a pistol fired from the clouds 10km away is capable of killing a person on the ground compared to when it is fired horizontally over same distance.
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### Kinematics: rest and motion [closed]

A ball is dropped from a height of 19.6 m above the ground. It rebounds from the ground and raises itself up to the same height. Take the starting point is the origin and vertically downward as the ...
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### Can we Predict the Trajectory of a hypersonic missile?

I read in a newspaper that we can't predict the trajectory of a hypersonic missile and this property makes the missile undetectable. But I couldn't understand why can't we predict it's trajectory? ...
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### Angle for max range from general range equation

Problem: Show that if a projectile is shot from a height $h$ with speed $v_0$ the maximum range obtains for launch angle $\theta = \arctan(\frac{v_{0}} {\sqrt{2gh+v_{0}^{2}}})$. I'm able to derive ...
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### (BASIC) How do I solve this free falling question?

If someone could just show me how to solve part A, I think I can try the rest on my own. Here is the question: A model rocket is launched straight upward with an initial speed of 47.0 m/s. It ...