Free fall Definition and 486 Threads

Let there be an obj. which is made to fall from a certain height in a gravitaitonal field. where a= 10 metre per second squared Say it falls for 1 second. v(final velocity)= 10 metre per second. How much distance does it cover in that 1 second? distance = speed x time = avg...

Homework Statement a. Is the downward acceleration value of gravity in Winnipeg acceptable anywhere on Earth? why or why not? How could you test this theory using common technology (no computers)? b. Does the temperature of air affect the drag on an object? Why or why not? c. When you drive...

A Person in "Free Fall" Newton's 2nd Law Homework Statement An 80kg aviator is in free fall and acquires a velocity of 60 m/s and then opens his parachute. After falling an additional 30m, his velocity has been reduced to 20 m/s. What is the average acceleration of the aviator while his fall...

Homework Statement Within this lab I was supposed to perform a virtual experiment and find the rate a ball dropped on the moon, mars, and earth. I have recorded all of my results in the table below. My problem is that my average velocity on Earth ended up as 8.9 m/s, and I thought that the...

free fall equations ...Sky diver Felix :) need some help please hi :) OK..i tried to use the equations below to evaluate the distance or the time at which felix will reach the speed of sound ...but i failed ..i need some help: here what i did: first i neglect the air resistance , but the...

If you push an air filled ball down to the bottom of a bucket of water an acceleration is caused by the buoyant force being greater than the force of gravity, so you have a net force up. I was wondering if you tried this on the ISS where water becomes a floating sphere. How does the ball...

I have this excerise to do: A boy is standing on the tower o height h. He shot with his slingshot a rock vertically up with velocity v0, gravitational acceleration equals g. After what time t the rock has fallen? Answer is t = (v0 + sqrt((v0)^2 + 2gh))/g but how to get to it...

Homework Statement If an object travels half its total path in the last second of its free fall, from rest, find: (a) the time, and (b) the height of the fall Homework Equations I'm not sure at all what equations to use The Attempt at a Solution The only thing I can think of...

Homework Statement (Yes this is a question about Batman.) To escape from Batman, 4 villains on motorcycles drive horizontally off the edge of a parking garage, landing in a pile of sand. The riders all have different initial speeds: v0A = 14m/s, v0B = 24m/s, v0C = 18m/s, and v0D = 19m/s...

This isn't so much a H/W question, but we have 2 sets of values, TMax and Tmin. Δ is the difference between them. We are told to get Δ/2 and get the %uncertainty of this. Why do we halve Δ?

Homework Statement A package is dropped at time t = 0 from a helicopter that is ascending steadily at a speed vi. What is the speed of the package in terms of V_{i}, g, and t? Homework Equations V (t) = V_{o} + -9.8 t The Attempt at a Solution I thought it was the same as the...

Homework Statement An arrow is fired upward with an initial speed of 38 m/s. What is it's maximum height? How long does it take to return to the ground? How high is it at 1.3 seconds? How high at 3.8 seconds? Homework Equations x = Vo*t + .5*a*t^2 y = .5gt^2 etc. The Attempt at a...

Homework Statement A certain object is falling in free fall down a building. The object falls the last 30 meters in 1.5 seconds. What was the total height it was dropped at. Homework Equations s=(1/2)(g)t^2 The Attempt at a Solution I've tried setting the total height to x+30...

Homework Statement A ball is dropped from the top of a cliff. If time taken for half of the descent is 3s, then what is the time taken for the rest of rest of the descent? Take g=10m/s2 Homework Equations T=√(2h/g) v=u-gt s=ut-gt2/2 The Attempt at a Solution T=√(2h/g) h=T2g/2=45m...

Hi, As I understand, the distance covered by an object in free fall is described as d = \frac{1}{2}gt2 or d = 5t2 on earth. Objects accelerate at 10 m/s2. Using the first equation, if an object has fallen for 5 seconds then it has covered a distance of 125 meters. If objects, however...

Hi, In a demonstration that was shown in class, two paper cups were dropped from different heights. The first was dropped from two meters and the other was dropped from one meter. Both landed on the ground at the same time. Why is this so? Would it be reasonable to say that if I dropped one...

So here is the scenario: an adult male 80kg, 6ft tall, slim build free falls into the open ocean feet first, hands locked into the groin. Speed at entry can be 200km/hr. We can assume the water is perfectly stile in reference to the surface tension. and for the body we can estimate some factors...

Hi people! I have a real life problem that i can't solve...Im trying to figure out the tangencial speed or angular velocity of a hatch at the moment it is about to close (initially it was closed). The hatch has been accelerating due to gravity. It looks much as a pendulum to me. But, it gets...

An object is thrown vertically up from the top of a tower with an initial velocity of 29.4m/s. Four seconds later another object is drop from the top of the tower. How many seconds will the two be at the same level? I'm trying to solve it for a day already. Sorry, I suck at this :P

in free fall without air resistance what is the force that causes the constant acc? Is it the object weight ? And in free fall with air resistance what is the applied force ? Is it the weight of the object and the resistive force is the air resistance? And the net force is the one that causes...

Hello. For free fall to occur, does the rate at which you fall have to equal the gravitational field strength at that point above the surface? If I'm in an airplane and accelerate towards the ground at an acceleration of 9.8ms^-2 equal to that of the Earth's gravitational field, then I...

A small steel ball is hot vertically upward from vertically upward from the top of a building 25 above the ground with an initial velocity of 18 m/s . 1 ) In what time it will reach the ground ? 2 ) compute the velocity with which it will strike the ground and the total time it is in the...

Homework Statement A small piece of Styrofoam packing material is dropped from a height of 2.00 m above the ground. Until it reaches terminal speed, the magnitude of its acceleration is given by a = -g + bv. After falling 0.500 m, the Styrofoam effectively reaches terminal speed, and then...

Lets say I am in free-fall towards some massive body and I have 2 mirrors and photons bouncing in between them. Now as I fall closer to the massive body the light should get blue-shifted right? And let's say that the frequency of light that I started with is x. As I fall closer I put a jar of...

hello every body. I have a high school problem a straight horizontal wire is falling freely in a homogeneous horizontal magnetic field, perpendicular to the wire and i want to find the inductive voltage. I said E= Blv=Blgt But I can also say E=ΔΦ/Δt=BΔΑ/Δt=Βl1/2gt [t][2]/Δt=1/2Blgt why...

we are in weightless condition because there are no resultant force between Earth and me,at this instant, Earth and me are in the opposite direction moving toward each other,will Earth oso can consider weightless? when i free falling p/s : beg pardon at 1st typing massless ,typing error ==

Hi, An object is falling near the surface of the Earth. We assume there is a drag force acting on it due to the air molecules. It's initial conditions are such that it rotates and is in a chaotic motion. Will the object will fall in the end in such a way to minimize air drag? And if yes -...

A ball of mass m is released from rest at x=0. Air resistance is expressed as R = kv2 , where k is a positive constant and v denotes velocity. Derive an expression for the speed in terms of the distance x that it has fallen. Identify the terminal v. I know I have to start with ma = mg -...

Homework Statement Consider the system below. The 2.50 kg mass compresses the spring (k = 805 N/m) a distance of 0.230 m from equilibrium. The mass is then released from rest. It slides a total distance of 1.20 m on the table top where it feels a force of kinetic friction of 5.60 N before it...

Homework Statement A rock is thrown vertically upward with a speed of 17.0 from the roof of a building that is 60.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? Homework Equations I used v^2 = vinitial^2 + 2a(y - yinitial)...

Homework Statement The problem is to find the velocity as a function of time, given the following; the object is in free fall and its initial velocity is zero. The formula given for the air resistance is: a = g - kv, where g is acceleration d/t gravity, k is a constant, and v is velocity...

Hi everyone, I am doing a lab report about free fall, but I have to find the terminal velocity for the balloon, but I don't know if I can use the formula velocity = Distance / Time because I have 10 measures from free fall ( 0.2 m - 2 m) , and I have the time that it took to hit the ground...

[b]1. Wondering if there are any different equations out there for free fall drop. [b]2. The only one I received was H=1/2gt^2 [b]3. I don't know if there are any others, someone said ΔX=ViTf+1/2aTf^2, but I don't think that's for free fall?

Does a falling object hit the ground with a force of its mass times "a" of gravity? Hi, When an object is falling through the air and in free fall with no air resistance, the applied force is the net force on the object: the object's mass times the acceleration due to gravity (or...

Homework Statement A ball is thrown horizontally at 16m/s from a clifftop 65m above the sea level. Find the time to land Homework Equations distance = Vi*t + at^2/2 The Attempt at a Solution I separated x and y components. And tried to plug them in this formula. I thought...

Wgat would a "light clock" measure in free fall? I've read in a couple of different books that the similarities between acceleration from gravity and rockets or whatever is only local. Both books said one of the reasons is because with acceleration from gravity two objects in free fall starting...

Homework Statement A particle of mass m falls from rest from height h above the ground. The retarding force per unit mass due to air resistance is kv^2 where k is a constant and v is the velocity of the particle a) write and simplify the equation of motion for the particle b) find an...

Homework Statement Well, that's all, my mid-term exam came a question that asked me: if a body with mass of 50 kg was weighed on a scale that is inside an elevator in free fall, how much will it weight? I supposed that the same it would weight on the surface, since gravity never stops...

Would anyone know how to determine the area that a drag shield would have to be to allow an object above not to experience no more then .001 Gs? The drag shield that I was thinking about is just a flat sheet attached to the bottom of the top object by a string. Would this even be possible?

Homework Statement A juggler throws a ball just so it reaches the ceiling at 3.0 meters. (3m above hand) How do I solve for initial velocity? Homework Equations The Attempt at a Solution

does a person feel weightlessness or any differences when he make a free fall under gravity of different values say 10m/s^2 or 25 m/s^2. Also it is said a person float in empty space is similar to a free fall. Free fall means it speed accelerates, then it would reach an infinite speed if it...

Homework Statement when g = constant , time = v / g if g varies how do I get t ? One electron is at rest at r0, 3600 km from surface of Earth (r), 10.000 km from center. g(r) = 9.8 m/s^2 , g(r0) = 4, Δ PE = 2.25 x 10^7 1) If it fell in a vacuum, after how many seconds...

Homework Statement A scaffolding is rising at 1.0 m/s when at a height of 50.0 m , then the man on the scaffolding drop a can. determine: a. the time needed for the can to reach the ground . b. what is the final velocity ?Homework Equations note: g=-9.8 m/s the letter o in the equation...

Hello, I was wondering under what conditions does free fall need to comply to in order to take effect? I am pretty certain that for an object to be in free fall it needs to be void of any friction, but what about air resistance? Or is air resistance a form of friction? Thank you in advance.

Homework Statement Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.00m. The stones are thrown with the same speed of 9.00 m/s. Find the location (above the base of the...

Homework Statement A test of the prototype of a new automobile shows that the minimum distance for a con- trolled stop from 100 km/h to zero is 41 m. Find the acceleration, assuming it to be constant as a fraction of the free-fall accel- eration. The acceleration due to gravity is 9.81...

Homework Statement During the second world war the Russians, lacking sufficient parachutes for airborne operations, occasionally dropped soldiers inside bales of hay onto snow. The human body can survive an average pressure on impact of 30 lb/in2. Suppose that the lead plane plane drops a...

Hi, This is from "3000 solved problems in physics". Yes, I have the solution but I still have a question. a ball is thrown vertically upward with a velocity of 20 m/s from a top of a tower having height of 50m. On its return it misses the tower and finally hits the ground. What time t elapses...

Hi all, I have a GR exam on tuesday and getting a bit confused as to how to find the metric for an observer in free fall a distance two schwarzchild radii from a black hole. I know this is a bit of a basic question but I am just wondering if I am correct to substitute r=2rs and dt=d(tau)...

I was told i have till wednesday to do a project on physics I've never done before in class, this being a regular high school physics class. So i decided to figure out how a parachute affects free fall and the calculations and stuff to show this. So far I've found an Air Resistance formula...