Force of gravity Definition and 101 Threads

By what factor does the force change if a. The mass of the 10-kg ball is doubled? b. The mass of each ball is doubled? Fg=(Gm1m2)/r sqrd i know i can find the anser by using this but i don't know hoe to do it for (a) i don't have the masse of the second obj. so double of 10 is 20...

Homework Statement ok this is the scenario: just supppose you had a block of ordinary ice on a frozen lake. Of course, it is free from all friction. Now, suppose some continuous, constant force acts on the block in a horizontal direction. after some time, the force is stopped so the speed of...

During construction of the Canada pavilion in Vancouver, a wrench fell out of a hovering helicopter and took 9.0 s to reach the ground. How far was the helicopter from the ground? I'd assume you find Vavg. And put it into d = v/t But when I do that I end up with d = 4.9. The answer says...

Where does mass get the energy to supply a pull on other objects?

Homework Statement The force of gravity at Earth's surface on an astronaut if 634N. What is the force of gravity on the same person if the distance is 2m, in multiplies of Earth's radius, from the center of Earth?Homework Equations F=Gm1m2/r^2The Attempt at a Solution I really don't understand...

1. Calculate the force of gravity between a newborn baby (mass=3kg) and the planet Mars (mass=6.4 X 10^23 kg) when Mars is at its closest to Earth (distance=5.6 X 10^10 m). 2. F= G m1m2/d2 3. I got this far and I don't know how to break down the equation any further: F= G M m /R^2=...

If something has a mass of 1 kg and is at some height at rest, and I drop it, it will experience of force due to gravity of about 10 N. So does that mean that every second that passes by the objects feels a force 10 N pulling it downwards? So let's say that object falls for 20 seconds, would...

How do I find the difference in gravity pull on a object dropped from 1km, 10km and 100km based on the objects mass (such as Earth vs the moon) e: Don't care about drag

Homework Statement Calculate the formula for the force of gravity in a universe where Kepler's 2nd law holds and a planet revolves around the sun with polar eq r = 1 + sin (theta). Theta = pi/2 is where velocity and position vector are perpendicular. Homework Equations Universal...

Homework Statement A man sitting on the edge of his seat on a Ferris Wheel has a mass of 50.0 kg. The Ferris Wheel has a radius r=30m and the ferris wheel completes a single revolution every 20 seconds. Find the force between the man and the chair. Homework Equations FNET=ma...

Homework Statement My teacher explained to my class that Normal force equals Force of Gravity. Given a free body diagram on a flat surface, Normal force is directed up, and Force of Gravity is directed down. Homework Equations So my teacher did the following: Fg = Force of gravity...

Does anyone know the equation for the Force of Gravity in terms of density? I have been trying to plug in the equatin for the density of a sphere into Newtons Gravity formula and keep hitting dead ends. And if you can show me the math and reasoning behind it please.

My friends and I have a problem that seems simple enough, but has proven to be pretty hard. We need some help. Suppose you have an object in space with no initial velocity relative to the Earth. Now, due to the Earth's gravity, the object will begin to accelerate towards the Earth...

Homework Statement Two chain links are connected together and are suspended by a string. The mass of the top link, link#1 is 8kg, while the mass of the second/bottom link #2 is unknown. If an applied force on the string attached to link #1 of 216N[up], and the links experience an acceleration...

Homework Statement If the Earth radius is 6.4 X 10^3 km, calculate the force of gravity on a 1.0 X 10^5 kg space station situated (a) Earth surface (b) 1.28 X 10^5 km from the center of the earth (c) 3.84 X 10^5 from the center of the Earth ( about the distance to the moon) (d) 1.5 X...

A reasonably large object moving though air experiences a drag force proportional to the square of its speed. If an object is falling vertically downward at half its terminal speed, how does the drag force acting on it compare to the force of gravity? express your answer as a multiple of Fg

does the following equation Fg = (G m1 Me)/Re^2 the R is the radius had to get the e subscript neglect the fact that the Earth isn't really a sphere? that the Earth dosen't move in a complete circular orbit? That the Earth experiances a drag force among others as it moves...

Homework Statement An astronaut weighs 900 N when measured on the surface of Earth. How large would the force of gravity be if he were in an Earth Satellite at an altitude equal to Earth's radius? The correct answer is 225 N. However, I need to know the exact steps taken to get the...

The force of gravity on Earth attracts things to the centre of the Earth, no? I understand why the gravitational force is less on mountains, as one is farther away from the centre of the Earth, so when using Fg=GMm/d2, then distance is larger, therefore the squared number would be larger than at...

If I wanted to use F=(GMm)/(r^2) to find the force between a photon and the Earth could I use E=hf and then find the energy the plug it into E=mc^2 then use the to find the mass equivalence and then plug it into the first equation. would this work.

Homework Statement I'm studying for a physics exam and made up the following problem to practice. Since I made it up there is no way to check my answer and I would greatly appreciate any and all feedback. Find the force of gravity exerted on a point mass m at the tip of a snowcone (portion of...

Homework Statement an electron is held up against the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron is the proton? Homework Equations F= ((K)(Q1)(Q2))/R^2 Qe = 1.6x10^-19 The Attempt at a Solution Using the formula for...

How do you find the effective force of Gravity when at a particular latitude? I keep trying to figure it out, but I can't seem to wrap my head around it. I understand that some small portion of the force of gravity goes towards your centripetal acceleration at certain latitudes, but I can't...

Homework Statement You are an astronaut in the space shuttle pursuing a satellite in need of repair. You are in a circular orbit of the same radius as the satellite (400 km above the Earth), but 20 km behind it. How long will it take to overtake the satellite if you reduce your orbital...

Homework Statement A plastic sphere with a positive charge of 4.8 x 10^-19 C is held stationary in a gravitational field of strength 9.8 m/s^2 by an electric field of strength 1.2 x 10^5 N/C. What is the force of gravity on the sphere? Homework Equations F_e=qE=kQq/r^2...

Homework Statement I have two questions (stated below), but do not feel confident about my answers: (1)Which of the following statements about the force of gravity is false? a. it is a universal force, which acts everywhere in space b. its strength decreases as the square of the...

Homework Statement A person weighing 800N on Earth travels to another planter with twice the mass and twice the radius of the Earth. The person's weight on this other planet is most nearly... earth radius is 6,380,000m earth mass is 5,970,000,000,000,000,000,000,000kg Homework Equations...

for example, a book is at rest on a table. One might say that the normal force is the reaction force. BUt reaction forces always have to be equal in magnitude, and you put an object on the book, then the normal force would increase to keep the book at rest, therefore the normal force is...

homework help! Homework Statement 1. The force of gravity acting on an object near Earth’s surface is proportional to the mass of the object. Why does a heavy object not fall faster than a light object? 2. What happens to the gravitational force between two masses when the distance...

1. Homework Statement Calculate the force of gravity on a spacecraft 19200 km (3 Earth radii) above the Earth's surface if its mass is 1500 kg. 2. Homework Equations Fg=[(G)(M spacecraft )(Mearth)]/r^2=ma. 3. The Attempt at a Solution...

Homework Statement a) You are adrift in the solar system with no planet nearby and you are out at the same distance from the Sun as the Earth. What is the magnitude of acceleration due to the Sun's gravity you experience? Homework Equations Earth-Sun distance = 1.50 x 10^{11} M_{sun} =...

Homework Statement Where does mass get the force of gravity? Homework Equations F = G(m1 x m2)/r^2 F = force (N) G = Gravitational constant (Nm^2/kg^2) m = mass r = distance between m1 and m2 The Attempt at a Solution

Homework Statement Force of gravity on a spaceship is 900N. What is the force when mass is double and distance from Earth center is 1/4 as far? The Attempt at a Solution the answer i got was 28800N, but i just applied proportionalities apparent from in the equation...

Homework Statement The force of gravity experienced by a person on Earth is 750N. What is the force of gravity on the same person aat each of the following distances, in multiples of the Earth's radius from the centre of earth? Homework Equations FG=mg The Attempt at a Solution The...

Nature decides that instead of inverse square law for gravitational forces the law will be inverse cube law. In that case what among the following will be true? a) The force of gravity from the sun will be weaker b) The period of the planet will be proportional to the square of the distance...

objects near the Earth's surface fall towards the center of the planet due to the force of gravity caused by its mass. once you get far enough away from the planet, the object will orbit. what is the force that is causing the orbit, keeping the object from falling to the surface? the force of...

Problem: Suppose that the Earth retained its present mass but was somehow compressed to half its present radius. What would be the value of g at the surface of this new, compact planet? My work: So, this seems pretty simple, and I get the right answer, but I seem to be off by a lot of...

I need help badly! 1. A bicycle rider pushes a bicycle that has a mass of 13 kg up a steep hill. The incline is 25* and the road is 275 m long. The rider pushes the bike parallel to the road with a force of 25N. How much work is done by the force of gravity on the bike? 2. Your car has...

Suppose you had two bars with mass m and length L and there were parallel to each other, along the same line and a distance d apart. How do we calculate the force between them? ______________ ______________ |-----L--------| |------d-------| |-------L-------| I figured...

I can't seem to get a correct # for the force of gravity on earth. I tried this: 6.673e-11(UGC) * 5.9742e24(mass of earth) * 15(mass of object) / 6378.1(radius of earth)^2 For some reason it gives me -.02867... and i no that can't be correct, what did i do wrong><?

This seems like it should be very easy but I keep getting the wrong answer. Here is the problem. "Calculate the force of gravity on a spacecraft 32000 km (5 Earth radii) above the Earth's surface if its mass is 1300 kg." In my book there is problem very similar so I tried doing the same...

Is it possible to build a logical argument on the following line? 1) The force of gravity can only be observed between two or more bodies. 2) The claim that a single body has a gravitational field is purely theoretical; it cannot be observed. 3) If the only demonstrable gravity force is a...

hi i am stuck and don't know what to do next or if i am even on the right path. could someone help me please! :cry: my question is what is the force of gravity between two 100kg cars separated by a distance of 25m on an interstate highway? I started out like this: fg=Gm1m2+6.67 x...

This question may have been posed before but, is there a particle that goes along with the force of gravity? And if so does it thereby follow the possibility of the existence of antigravity particles? Any info appreciated thanks :smile: :smile:

I need help in calulcating the velocity that it is neccesary to spin a 200 m circle in order to make the force some one would have against the floor of this circle be the same as on Earth. EDIT: No given mass. only the force neccesary and the radius.

The force of gravity is twice as great on a 2-kg rock on a 1-kg rock. Why does the 2-kg rock not fall with twice the acceleration?

Calculate the force of gravity on a spacecraft 6400 km (1 Earth radii) above the Earth's surface if its mass is 1400 kg. i started by using the Fg = GMm/d and i plugged in the numbers so it looked like this (6.67*10^-11)(1400)(?)/12800 i don't know what m should equal and i can't...

I am really confused, according to E=MC2 energy must contribute to the force of gravity, so that means that every time a molecular bonding occurs then gravity must increase, but how? the energy and mass has always been constant, what am i missing

would the force of gravity also double? and what about when the force of gravity triples, then what would happen to the force of friction? Would it be the same down the road, like for example, when it quadruaples, would the force of friction also quadruaples..and have a direct relationship btw...

Would a graviton emitted by a proton lose energy as it climbs through the gravitational field of the proton - would other gravitons inhibit its progress?If the graviton is absorbed by another proton then would it get the energy back as it falls in the gravitational field of this second...