Free fall Definition and 486 Threads

Hello I have a projectile project. we throw an object with variable speed but about 80 mps and about 90 degrees from Earth level. our goal is to find maximum height that is usually between 250 to 350 meters by means of 3 axis accelerometer and 3axis gyro ( MEMS technology ). In fact we use...

Centrifugal force due to rotation of the Earth has among its effects the deviation towards the equator of a ball falling from height ##h## vertically on Earth. I do not understand what is the inertial explanation of this phenomenon. Once the ball is released there is no centripetal force that...

Homework Statement A balloon is ascending at an speed of 13 m/s. At 300 m from the ground a ballast is drop from the balloon. Find the maximum height the ballast reach. My doubt is: When the ballast is drop ¿it starts falling inmediately?. The solution of the problem implies that the ballast...

I. Free Fall Motion A mass m = 544 g is thrown straight up with an initial speed of 3.50 m/s from a height of h = 2.50 m Neglecting a drag force, determine: 1. The acceleration of the object while it moves up. 2. The acceleration of the object at the highest point. 3. The maximum height...

Homework Statement Two students are on a balcony a distance h above the S street. One student throws a ball vertically downward at a speed vi ; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of vi, g, h, and t...

Homework Statement a stone is dropped from a cliff 200m high.if a second stone is thrown verticall upwards 1.50seconds after the first was released.strike the cliff base at the same instant as the first stone.with what velocity was the second stone thrown 2. Homework Equations Xf=xi +vt +...

Homework Statement A stone is dropped from rest from the roof of a 100-m high building; 2.00 s after that, a second stone is thrown straight down with initial speed v0, and the second stone passes the first stone 21.6 m above ground. (a) When are the stones at the same height? (b) What was the...

Homework Statement A stone is thrown vertically upward from the top of the tower with a velocity of 15m/s. Two seconds later a second stone is dropped from the top of the tower.if both the stone strike the ground simultaneously find the height of the towerV1i=15m/s V2i=0m/s t=2s h=? Homework...

Homework Statement An inquisitive physics student and mountain climber climbs a 50.0m high cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.00 m/s. (a) How...

in science shows , an airplane made to fall freely under gravity has its passenger floating in mid air i understand weightlessness is due to 0 normal reaction by floor on person but since both passenger and plane have same aceleration due to gravity what might be reason for relative separation...

Two objects thrown from a cliff. One with + vinitial (upward) One with - vinitial (downward). Does the one with + vinitial not reach a greater height and thus have a larger vf upon hitting the ground since it falls farther and therefore is subject to gravity longer?

Homework Statement Write a C program to simulate a falling object. The program should ask for the initial height of the object, in feet. The output of the program should be the time for the object to fall to the ground, and the impact velocity, in ft/s and miles/hour. Your program should use...

So I have to calculate the initial velocity of an object I dropped from 2.195 meters that took .96 seconds to hit the ground, given that the Earth's gravitational pull is 9.81m/s^2. What direction/step should I first take in order to solve this? I'm not asking for the answer just a step or two...

Homework Statement Using Newtons second law, if an object with mass M is free falling (the only F acting upon it is its own weight), calculate the object's acceleration. What would happen to its acceleration should its mass duplicate? Homework Equations F=ma The Attempt at a Solution So...

Homework Statement Calculate the length of time it would take for an object to fall 10.0m if g were one sixth the value of Earth's g. g=1/6(-9.8)= -1.633333333 m/s^2 a=-1.633333333m/s^2 displacement=10.0m[down] Homework Equations Maybe one of the big 5 kinematics equations? Or maybe...

how two objects hit the ground at same time regardless of their weight of masses. what is the reason of Acceleration is always constant via gravitational force for both of them. F=mg F1/m1=F2/m2

Homework Statement While parachuting, you dropped your sun glasses at a height of 1400m and it took 15 seconds for the glasses to fall onto the ground. What is your descend speed after you dropped your sun glasses? Homework Equations Y = VoT + 1/2at^2 The Attempt at a Solution My thought...

Homework Statement The Drop Zone drops riders 27m from rest before slowingthem to a stop. How fast are they moving before they start slowing down? vf=? vi=0, di=27m[up], df=om, displacement=27m[down], acceleration=9.8m/s^2[down] Air resistance is negligable Homework Equations...

Homework Statement I am analyzing free fall motion in my computer code class. We haven't really discussed much about air resistance and it is a bit of a foreign topic for me. I am searching the internet as much as I can for information on it, but would really appreciate talking to someone here...

Homework Statement I'm using ROOT (c++) to graph a numerical representation of the equation of motion. For simplicity, I am using initial velocity = 10 and initial height = 10. change in time = 0.05 so we find velocity by V_n = V_(n-1) -9.81*0.05 For some reason, this code is not giving me a...

Homework Statement I am tasked with coding some graphs regarding free fall motion. I am unclear what the professor means regarding the following, so I am looking for incite here. Problem: Solve numerically free fall velocity equation (problem 1.1), compare with exact solution (1.1) dv/dt =...

Homework Statement Can free fall acceleration be determined by dropping a marble through a single photogate? The CPO timer attached to the photogate can measure the time it takes for the marble to pass between the arms. Knowing the diameter of the marble enables one to calculate the speed. If...

The facts are that the person is 183cm, 82kg, meaning his center of gravity is about at 105cm, he was running towards a railing of a balcony that is 108cm high, and allegedly hit the railing then fell over. Is this physically possible?

Homework Statement Doing this from a memory of a final exam question from freshman physics that I could not solve 45+ years ago. A coin of radius R is poised at the top of another (fixed) coin of radius 2R. If it rolls with no slip, at what point will the top coin leave the lower coin. (I...

Homework Statement A 84.0-kg bungee jumper steps off a bridge with a light bungee cord tied to her and to the bridge. The unstretched length of the cord is 15.0 m. The jumper reaches reaches the bottom of her motion 38.0 m below the bridge before bouncing back. We wish to find the time interval...

Hi I'm trying to explain how this cartoon is physically impossible I know its impossible from common sense, but i don't know how to explain it using physics terms So my questions are: 1) Does the air resistance force have to be much greater than the Fgrav to make you land safetly? If so...

Suppose you have a weightless rod with at the endpoints two masses. This is a special rod whose length varies in time as a function L(t). If I consider this rod in free fall my intuition is that this rod will rotate for suitable L(t). However, I want to write down the equations of motions for...

Hi I'm confused about what an accelerometer actually measures. I downloaded an app that reads out the data of the accelerometer in my phone in all three dimensions. If I lay it flat on a table, it says something around 9.81 in the z direction and something around zero in the x and y directions...

Hi guys, I'm working on my project with accelerometer. I know that accelerometer measure specific force or proper acceleration in general by deflection of proof mass. Proper acceleration is relative to free fall which could be analogy that proper acceleration is the relative acceleration...

I am confused about whether objects when a nonuniform mass density experience net torque during free fall. If you take a rod that is heavier on one end and lighter on the other, should it not experience a net torque and angularly accelerate? But at the same time, the acceleration by gravity is...

Homework Statement A hockey puck slides off the edge of a table with an initial velocity of 20 m/s. The height of the table above the ground is 2 m. At what angle below the horizontal does the puck hit the ground? Homework Equations d=Vi(t)+(1/2)at^2 a^2+b^2=c^2 The Attempt at a Solution...

Homework Statement So there is a falling object, you have to take into account the boyant force, the pull of gravity and the drag force A time dependent distance equation is what we're looking for Homework Equations Fd=CdApav2/2 Where Fd is the drag force Cd is the drag coefficient A is the...

Why is gravity negative in certain equations, such as y = yi + vi t + (1/2) ( − g ) t^ 2 , but positive in others like vf^2 =vi^2 +2gh ?

Homework Statement A rock is thrown straight down with an initial velocity of 10.5 m/s from the Verrazano Narrows Bridge in New York City. The roadway of this bridge is 70 m above water. Take upwards to be the positive direction. Calculate the displacement and velocity at a time of 1.0 s. The...

The acceleration of free fall at the equator is not equal to the acceleration of free fall at the poles.explain?

Homework Statement Assume a ping pong of mass 3g is falling, and it has fallen 1m and is now traveling at 5 m/s. If the air resistance force is half its weight, how far will it travel in the next 0.1 seconds. [Hint: you may want to sketch a velocity-time graph) Homework Equations Understanding...

Homework Statement Object A has VA =20m/s going downwards, Object B has VB=20m/s going upwards. Only gravity is given and they are traveling along a straight line vertically. What is the Δt when they meet and what Δd for object B. Homework Equations 5 Kinematic equations + v=Δd/Δt,a=Δv/Δt...

Homework Statement Whenever I solve a free-fall problem and it asks for the time, I never am sure what the time represents once I solve for it. I understand when you throw a ball in the air and it comes back down, the time it takes to ascend up, is the same time it takes to descend down...

Homework Statement A ball (m=0.7kg) is dropped from a height (h=30m). The air resistance force is given by the formula F=kv^2 where k=0.0228 and v is the ball's speed. The ball bounces after a perfectly elastic collision. Calculate the maximum height the ball reaches after the collision...

Homework Statement This is a 'random discussion' that I had today with a student; it is not out of a textbook, nor does the solution carry any weight at all (pls excuse pun).[/B] A simple pendulum is happily swinging back and forth attached to a pin in the wall of the lift, where the pin is...

Normally in a free fall , there will be gravity acting to your body but when we free fall , we don't really feel the force , we feel weightless ( ignoring air resistance ) , ( not in contact with anything). Why?

1. "An object is in "free fall" when the only force acting upon it is gravity". 2. Is gravity in this case singular or plural? Is the acting gravity the resultant force of all bodies in the universe? 3. In theory, my own bodys gravitational force is acting on the object and thus it's not...

I had a though last night that kept me awake trying to figure out what I was trying to understand. I have been out of school many years now so I have forgotten much.. Here is my question. Lets imagine there is a 30 meter diameter hole (complete with a vacuum) in my front yard that goes through...

When you have a metallic ball hanging from a electromagnet and you disconnect the electromagnet, there is a delay between the moment you unplug the machine, and the ball starts falling. Why does this happen?

When a Vessel of water is under free fall and there is a hole in the side of the vessel, why does no water come out of the vessel? (its given in my textbook that pressure exerted on sides of vessel is zero. But what does the horizontal force have to do with the vertically acting force due to...

If an object is dropped from height, h, then gravitational energy is E = mgh, but kinetic energy when object hits the ground is E=(1/2)mv^2. Conservation of energy states that E(g)=E(k). Why does kinetic energy not depend on height object was dropped?

Homework Statement In this problem I don't know the release point/origin of a dropped ball. I do however have a stroboscopic photograph of it moving through my frame of reference. In my frame of reference it moves 2.0m in 4 seconds. Now, I am suppose to figure out how far above the first...

Homework Statement Equation for the time of a free fall with an initial velocity? Homework Equations √ (2 ⋅ h / a ) The Attempt at a Solution Is it √ (2 ⋅ h / via )Thanks for the help :)

Homework Statement I'm trying to show that any tunnel through the Earth (not necessarily through the center) will have a free-fall time that is the same. I heard this was true somewhere. Homework Equations acceleration of free-fall = GM / r^2 where r is changing I believe this involves trig...

Homework Statement A freely falling water drop continually evaporates. Assuming that the net momentum carried away by the vapor vanishes, calculate the velocity of the drop as a function of time. (Assume that the rate of evaporation varies as the surface area)[/B]Homework Equations dA/dr =...