The newton (symbol: N) is the International System of Units (SI) derived unit of force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.
A newton is defined as the force which gives a mass of 1 kilogram an acceleration of 1 metre per second, per second, 1 kg⋅m/s2.
I'm a middle school history teacher and I have to explain to a group of parents what 400 Newtons is. It's a long story...
I've googled Newtons and understand that they're a measurement of force. It would be great if someone could give me some real world examples of what can produce a force...
Homework Statement
Tell me what is wrong with this question-
A donkey which has heard of Newtons third law but not understood it very well refuses to pull a cart attached to it because it argues that: ' If i pull on the cart with a certain force, Newton's third law would imply an equal but...
So i have a few questions in relation to a practical completed in grade 11 Physics
The basic experiment about the 2nd law, in which a hanging weight is used to accelerate a cart
the practical also had a 2nd part in which weights were added to the small cart to decrease the acceleration while...
This is a direct quote from nasa.gov. I understand everything up until the last equation.
Can it not be written like F = mdot(v2-v1) ?
Also, this equation F = d(mv)/dt is the same as this F = (m dot * V)e - (m dot * V)0 ? Or no?
I understand Mass x Velocity is momentum and they want the...
Homework Statement
show that the forces between two current loops obey Newtons 3rd law. Homework Equations
\textbf{F}_{12}=\frac{\mu I_{1}I_{2}}{4 \pi s^{2}} d\textbf{r}_{1}\times(d\textbf{r}_{2}\times \textbf{s})
s is the distance between the elements of current
The Attempt at a Solution...
Hi I'm obsessed with this angular momentum conservation thing.From second law we can understand the linear momentum conservation easily, but in angular momentum i can't understand the logic.There comes a cross R which is the position vector.I searched a lot about this and couldn't find a...
Is it possible to hate Newtons Laws?
Hi,
I am taking a course in physics, and I have noticed that Newtons Laws, and Newtons Mechanics just bores me to death whenever I am reading about it or trying to do questions.
On the other hand, we started to do some Energy and Work chapters, and the...
this is going to sound dumb, but here i go.
through out my schooling i was preached " in a vaccum, a feather and a bowling ball would fall at the same rate".
-thinking about the difference in theories with Aristotol, Galileo, and Newton, something didn't make sense to me. Talking about...
Homework Statement
Imagine taking your dog for a walk. You feel a real bond for man's best friend. Could this be due to gravitational attraction? Estimate the force of gravity between you and your dog.
Homework Equations
force~mass1 x mass2 divided by distance^2
The Attempt at a...
Heres the problem
http://img141.imageshack.us/img141/2820/49686394mt3.jpg
Now I have to work it out using Newtons second law and Work energy...
For Newtons second Law (F = ma)...would I be using
I = mk^2
M = I\alpha
than setting up F = ma...?
and for work energy I am...
Homework Statement
Check out my attachment to get an idea what is happening. What we have is an inclined plane with 2 masses (m1 and m2) which are touching one another and the angle of the incline is 30 degrees.
The coefficient of kinetic friction between m1 and the plane is 0.23 = mu_k1...
Joe was driving on the highway a car ahead of him was driving far below the speed limit so he decided to pass. In the first second he gained(gained means to get nearer to something you are chasing) 5m on the car and as he accelerated he gained 1.5 times as much distance in each second as he had...
Hi guys.
This is my first post.
I am currently on an engineering apprenticeship and its mostly practical but i have been given a Newtons law question which i am finding very hard.
I have attempted it but still come up stuck.
I have attached the question with the drawing.
I have...
For some odd reason, I'm having no problems with the rest of the exercises, though this one is really annoying as i just can't seem to get it right.
Here's a picture of the exercise
h t t p://img2.freeimagehosting.net/image.php?4bc2e12442.jpg...
I was thinking about Newtons law and come across something interesting. F=ma=GMm/r^2
therefore a=GM/r^2. This is the acceleration of the satellite towards the larger mass. But this acceleration is only accurate assuming that the larger mass is stationary. But f=Ma=GMm/r^2, so there is an...
Homework Statement
What is the ratio of the gravitationalpull of the sun on the moon to that of the Earth on the moon?(Assume the distance of the moon from the suncan be approximated by the distance of the Earth from the sun.)
Homework Equations
F_{g} =...
Im trying to find my work when climbing up stairs. If I convert my weight into Newtons, do I still need to multiply it by 9.8? Since i weigh 135, I multiplied that by 4.5 to get my weight in Newtons. I then multiplied that by 9.8, after that I multiplied that by 3.0 m ( the distance of the...
Newtons law, interacting objects question??
A block of mass 5.00 Kg sits on top of a second block of mass 15.0 Kg, which in
turn sits on a horizontal table. The coefficients of friction between the two blocks are
: μs = 0.300 and μk = 0.100. The coefficients of friction between the lower...
can someone please help to reason out this. because i am confused...is the question about static friction..please help
On a truck which is moving straightforward on an horizontal road there is a big cube of concrete of mass m. The mass of the truck is M. The truck brakes suddenly with an...
Hey guys, was just wondering if you could explain the answer to this question. So basically we have a picture of a book resting on a table. On this book there is the weight force downwards and the reaction force upwards, both acting on the center of mass.
The question:
A class of students is...
[SOLVED] Newtons Second Law
Homework Statement
On a force/mass vs acceleration graph where force/mass is horizontal, what does the slope represent?
Homework Equations
The Attempt at a Solution
My calclations: ex. (2m/s^2 - 1m/s^2)/(3 N/kg - 1N/kg)
=.5 (m/s^2)/(N/kg)...
Homework Statement
three blocks attatched by cords that loop over frictionless pulleys. Block B lies on frictionless table, block a hangs off the left side of the table, while block c hangs off the right side. mass a= 6kg mass b= 8kg and mass c= 10kg. When the blocks are released, what is the...
[b]1. A figure shows an overhead view of a lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F1 has a magnitude of 4.70 N (in the negative x and positive y direction) and is at θ 1 = 29°. Force F2 has a magnitude of 7.00 N (in the positive x...
Homework Statement
The equation dQ/dt = k ( T - Troom) is Newtons law of cooling. dQ/dT being the rate of heat loss. I want to convert this equation to dT/dt, the rate of temperature decay. How do i go about doing this?
Homework Equations
The Attempt at a Solution
Is Q...
A red box and a blue box sit on a horizontal, frictionless surface. When horizontal force F is applied to the red box, it accelerates 4.88 m/s2.
a) If F is applied to the blue box, it accelerates at 1.32 m/s2. What is the ratio of the masses of the boxes (mass of the red box/mass of the blue...
A rope is tied to a 97.8 kg log. When you pull on the rope with a horizontal force of magnitude 706 N, the log moves at constant speed.
a) Find the magnitude of the resistive (frictional) force acting on the log. You may assume the frictional forces acting on the log is constant.
N
b)...
I have this problem on a web assignment due on the 20th of this month. A few of the problems have completely blown my mind including the following:
A force F0 causes an acceleration of 18 m/s2 when it acts on an object of mass m sliding on a frictionless surface. Find the magnitude of the...
Homework Statement
A block A (mass 2.25k) rests on a tabletop. It is connected by a horizontal cord passomg over a light, frictionless pulley to a hanging block B (mass 1.3kg). The coeffisient of kinetic friction between block A and the tabletop is 0.45. After the block is released from the...
I'm reading section 17 of Mathematical Physics by Donald H. Menzel on Harmonic functions.
They start with Newtons law of gravitation (although the following method can be aplied to any potential field with a 1/r dependence.)
see...
Homework Statement
You are dragging a stack of shoeboxes along the floor by a rope (an odd situation I must say). If the total mass of the shoeboxes is 18kg and the rope is pulled at an angle of 45 degrees with no acceleration
i) what is N (normal force)? and
ii) What is the tension of...
Hey guys, I was just wondering if you could help me with a question that has been bugging me for a while now. I've thought of many possibilities to the answer yet i still can't find the right one. The question is that, when a fly strikes the windshield of a truck moving at let's say 60km/h, why...
a 20 kg box is on frictionless surface acted on by two horizontal surfaces. when in same direction, it pulls 11 m/s but in opposite directions, it pulls only 1 m/s. determine magnitude of each force.
answer: 120 N , 100 N
okay...i need help with this. i am using Newtons law: force=mass x...
Homework Statement
Ok this is kind of long. This is the 4th question on my homework assignment and I need to give background on the first 3 to make sure I got those correct.
1. I am sure on this since it was simply finding the weight of a rocket ship that has an intial mass of 3kg. Answer is...
Hey all, I am new to Physics. Recently changed majors from technical writing to physics for the amount of interest I have in the subject. I have been doing ok but I missed a couple of questions on my last homework and I feel that I should have had somebody check my general solved statements...
hi, I am not really sure where this belongs, and being a complete noob at physics, i was just enquiring if someone could inform em of the formula to calculate the distance an object weighing 80kg would need to fall in order to be effected by 4,400 Newtons?
My teacher asked us too prove that Hamiltons principle proves that Newtons equations of motion hold for N particles. I'm not sure that i fully grasp the concept but this is my understanding so far:
Using the lagrangian we can prove Newtons law for specific situations, however Hamiltons...
I have spent a ton of time researching my question but i can't find the answer
i know that for every action there is an equal and opposite reaction
i know if you have a tire on the ground and when it starts spinning it pushes so that the concret will go the other way but the ground it to...
proof of Newtons gravitational law!?
hi every one,
i am new in this forum n here is my first question that really bothers me for a long time we always take for granted the formula given by Newton F=G*(M1*M2)/R^2 do u have any proof that is really satisfing.n i don't understand why Earth is on...
http://img75.imageshack.us/img75/9735/prob1ve7.jpg
Frictionless surface, pulled along a horizontal line, string has no mass
Calculate the mass m
The answer says 17,1 kg, i don't know if it is correct,
can sum1 please give a solution with the steps:smile:
Homework Statement
A plank, of length L = 3.7 m and mass M = 7.0 kg, rests on the ground and on a frictionless roller at the top of a wall of height h = 1.70 m (see the figure). The center of gravity of the plank is at its center. The plank remains in equilibrium for any value of θ >= 74° but...
If I have a small model car and use a spring scale to measure the force, my reading is .130 kg. How do convert that to Newtons? Is gravity relevant to this equation?
I know that F = m x a
the mass of the car is .387 kg
is the accerleration the acceleration of the car or gravity?
hey dudes
i read in a book that when an electric current flow that the electrons move preety slow [maybe 1mm/s I'm not sure]
now i also know electricity travels at the speed of light (ideally) so that an electron c*1s away will take 1s to start moving after i close the circuit
so i was...
Homework Statement
A uniform chain of length L, measured in feet, is held vertically so that the lower end just touches the floor. The chain weighs 2lb/ft. The upper end that is held is released from rest at t = 0 and the chain falls straight down. Ignore air resistance, assume that the +...
Homework Statement
Two spherical asteroids have the same radius R. Asteroid 1 has mass M and asteroid 2 has mass 2.58·M. The two asteroids are released from rest with distance 12.35·R between their centers. What is the speed of second asteroid just before they collide? Give answer in units...
Please help me because my teacher has not explained how to do questions involving angles.
Blocks X and Y of masses mx=5.12kg and my=3.22kg are connected by a fishing line passing over a frictionless pulley. Show that block X slides up the incline (35.7 degrees above the horizontal) with...
A bicycle of bicyclist of combined masss 62 kg go over a hump of radius 6m at a speed of 5m/s. what is their combined appararent weight at the top of the hump?
is it just...
Fc = MAc
Fc =M(V^2/r)
Fc = 62(25/6)
Fc = 290N
(1) What is the magnitude of the net force on a skydiver in N when an 810 N gravitational force and a 750N force of air resistance act on him?
Fn = 810
Fg = 750
810 - 750 = Fm
60N
(2) A 1200 kg car is moving in a staright line at a constant speed of 15m/s when the brakes are...
Homework Statement
1) The coefficient of kinetic friction for a 22-kg bobsled on a track is 0.10. What force is required to push it down at a 6.0 degree incline and achieve a speed of 60 km/h at the end of 75 m?
2) A box is given a push so that it slides across the floor. How far will it go...