Laws of motion Definition and 213 Threads

Homework Statement A smooth ring A of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of Mass M (=2m) as shown in the given figure. At a instant at the string between the ring and the pulley makes an angle \theta with...

Homework Statement http://go.hrw.com/resources/go_sc/phy/HF2SR042.PDF this is the link to the worksheet I am having trouble with. if anyone could help me out that would be great. i got most of it but have a few questions. Homework Equations fy=sin(angle) x force fx= cos(angle) x...

Homework Statement 73) A cyclist is coasting at a steady speed of 12m/s but enters a muddy stretch where the effective coefficient of friction is 0.60. Will the cyclist emerge from the muddy stretch without having to pedal if the mud lasts for 11 meters?. If so, what will be the speed upon...

Homework Statement An airplane of mass 1.2 x 10^4 kg tows a glider of mass 0.6 x 10^4 kg. The airplane propellers provide a net forward thrust of 3.6 x 10^4. What is the gliders acceleration. Homework Equations F(net) = ma The Attempt at a Solution After drawing FBD's...

Homework Statement A 75kg climber is supported in a "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are .8 and .6, respectively. what is the minimum normal force he must...

Homework Statement A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 3.0m and then stops. What is the magnitude of the average acceleration? Homework Equations aavg = change in V/ change in time magnitude of acceleration = change of speed/time...

1. A toboggan slides down a hill and has a constant velocity. The angle of the hill is 8.00 with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan 2. Static Frictional Force, FsMax=msFn 3. I have no freaking...

what is the force work on object B in terms of a ? i know that the frictinon should be bigger than the force mBg for that the object will not fall down. but how to express it in terms of a ?? TNX .

I curious about Newton have how many laws?

It is clear that Newton's first two laws of motion deal with motion: the velocity of a moving body is persistant, and net forces cause acceleration of such a body. However, in my opinion, the third law has more to do with the nature of forces rather than motion. The main point is that forces...

hello can some one help me, post a simplified version of Newton's 3 laws of motion and some examples thank you very much :)

Homework Statement Your airplane is caught in a brief, violent downdraft. To your amazement, the pretzels on your seatback tray rise vertivally, and you estimate their upward acceleration relative to the plane at 2 m/s^2. What's the donward acceleration of the plane? ANy suggestions are...

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 spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the Earth balance that exerted by the moon? This point lies on a line between the centers of the Earth and the...

Using Laws of Motion! Homework Statement The acceleration of a brick when lifted by 42N is a. The acceleration of the same brick lifted by 52N is 2a. What is the weight of the brick? Homework Equations Fg=mg Fapp=ma The Attempt at a Solution I don't really know where to start...

Homework Statement An insect crawls very slowly on a hemi-spherical shell.. The coeff. of friction between insect and surface of sphere is 1/3. The line joining the centre of the shell to the insect makes an angle of @ with the vertical. THE MAX VALUE OF @ IS DEFINED BY...

Homework Statement A girl weighing 30kg is standing motionless on a 2-kg skateboard holding a 7-kg bowling ball. She throws the ball with an avg force of 75N a.) what is the magnitude of her acceleration? b.) what is the magnitude of the acceleration of the bowling ball? Homework...

[SOLVED] Newton's Laws of Motion PROBLEM! A gardener pushes down along the handle of a lawn mower of 20 kg mass with a force of 150 N. The handle makes an angle of 60 degrees with the ground. Calculate the horizontal acceleration of the mower if the coefficient of kinetic friction between its...

A traffic light weighing 122 N hangs from a cable tied to two other cables fastened to a support, the upper cable makes an angle of 37.0 and 53.0 with the horizontal. these upper cables are not as strong as the vertical cable and will break if the tension in them exceeds 100 N. will the traffic...

Two blocks (5.0 kg and 6.0 kg) are connected through a frictionless system. Find the tension in the string and the acceleration of the system. The angle of the ramp is 45degrees. I have taken the direction of motion of each mass as the positive side. So this is what I did, For m=6kg...

Homework Statement 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 positive acceleration. Determine the magnitude of the acceleration...

Are Newton's three laws of motion correct as Netwon stated them? 1. The first law is the principle of inertia. It states that an object in motion will continue to move unless acted on by an external force. And that an object at rest will remain at rest unless acted on by an external force...

This is mainly stumping me because of the absence of any force or mass. Homework Statement A crate is sliding down a ramp that is inclined at an angle of 33.6° above the horizontal. The coefficient of kinetic friction between the crate and the ramp surface is 0.485. Find the acceleration...

Forces and the Laws of Motion HELP! Homework Statement A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0 degrees with the horizontal. the block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinectic...

Homework Statement Only two forces act on an object (mass=3.00kg). F1=60.0N 45.0deg above the +x axis, F2=40.0N on the +x axis. Find the magnitude and direction (relative to the x axis) of the acceleration of the object. Homework Equations F=ma, The Attempt at a Solution...

Homework Statement A 12000- kg helicopter is lifting a 4000- kg truck with an upward acceleration of 0.9 m/s2. Calculate the force the air exerts on the helicopter blades. Homework Equations F = ma The Attempt at a Solution I have no idea! Please help!

Homework Statement Two blocks m1 = 8.5 kg and m2 = 4.0 kg are connected by a homogeneous rope that has a mass of mr = 1.14 kg. A constant vertical force, F = 180.4 N, is applied to the upper block. What is the magnitude of the acceleration of the system? Homework Equations F=ma The...

My question is which law of Newton is the most fundamental? I am talking of the laws of motion...

« Laws of Motion » problem Homework Statement A man of mass = 60 kg is standing on a weighing machine inside an cabin (of mass = 30kg). The cabin is hanging from a pulley fixed to the ceiling through a light rope, the other end of which is held by the man himself. a) If the man manages to...

Hi, This is more of a problem with concept rather than an actual mathematical problem, so forgive me if I don't use the template provided. I'm just having an issue with Newtons laws of motion. If I were to pull a box across a floor to the right with my hand, assuming that the mass of the box...

I performed a lab where I had to find the acceleration of two masses that were connected by a string and hanging on a pulley. The equation used was: http://home.earthlink.net/~copper017/Random/PhysicsLab/acceleration.jpg After performing the calculations I got the following data...

A block of mass 20kg is pushed against a vertical surface at an angle of 30 degrees as shown. The coefficient of friction between the surface and the block is 0.2. What is the minimum magitude of P to hold the block still? I got 271.5 when I tried but the answer is 202.2

Homework Statement Hi, I am taking a correspondance physics course and just wanted to know if I am on the right track with understanding Newton's principles. Roberta drives her 1452 kg car along a straight , level road at a consant velocity of 30.0m/s (E). Her brakes suddenly give out...

Homework Statement A 3kg object hangs at one end of a rope that is attached to a the ceiling of a railroad car. When the car accelerates to the right, the rope makes an angle of 4 degrees with the vertical. Find the acceleration of the car. Homework Equations (sigma)F=ma ..and I think...

Homework Statement Having trouble with this problem, can't figure it out! Please help me! The persons cast is the green drawing (sorry by i was using ms paint) The problem is as follows: The leg and cast in the picture above weigh 220N (w1). Determine the weight w2 and the angle a needed...

I am thinking the following question for a considerable period. Which law of motion of Newton is the most fundamental? ...Well, there are talks and suggestions that it is a non-sense question. However, it may be…I have thought over it and expecting expert’s view. The current situation is that...

A friend and I were conducting a science experiment, where an object weighing roughly 550 grams was launched vertically, and after examining the video footage, was airborne for aproximatly 4.5 secconds. Having never studied physics before, I was curious if you could calculate the launch speed...

INTRODUCTION: The following is a problem of "Newton's Laws Of Motion". It is a typical problem of this chapter. I am having problems with some parts. THE PROBLEM IN BLACK AND WHITE: "Find the acceleration a_{A}, a_{B} and a_{C} of the three blocks shown in the diagram (not included here)...

Ok, I have some troubles understanding the 3 laws of Newton. 1st law: So if the net force exerted on an object is zero, the object continues in its original state of motion. The net force is the vector sum of all the external forces right? For example a book lying in the table. The net...

Help me please! please help my ap class just started on laws of motion and I am having problems with this question could some one please walk me through it ] a block is given an intial speed of 3.0 m/s up the 22.0 degree plane how far up the plane will it go? B0 how much time elapses before...

okay, so I've tried this problem and I keep getting it wrong. I would really appreciate some help in solving it. Here is the question: The parachute on a race car of weight 8820 N opens at the end of a quarter-mile run when the car is traveling at 35 m/s. What total retarding force must be...

Hi this problem stumps me. Two bricks each having a mass of 0.2 kg tied at the end of a light flexible cord and are passing over a small frinctionless pulley. A 0.1kg block is placed on one of the blocks and removed after 2 seconds. How far will each block move in the first second the 0.1kg...

A 5kg block is resting on the top right hand corner of a 10kg block. The length of the top of the 10kg block is 10m. Find the time taken by the 5kg block on top to slide of the 10kg block completely if the 10kg block is accelerating at 5m/s^2. My work: aB = accleration of the 5kg block aA...

Hi, You have most probably heard about the internet phenomenon Wikipedia, now the world's largest, an encyclopedia that anyone can edit. But currently, the article on Newton's laws of motion is in a poor state. It needs your help to get upto shape. You can edit the page by clicking the edit...

hey, i was wondering if somebody out there may be able to give me examples of Newton's Laws of motion in practise so that I would be able to grasp the concept of the these laws thanks for your time, Pavadrin

Two bodies of masses m1 and m2, are released from the position shown in the figure. If the mass of the smooth-topped table is m3, find the reaction of the floor on the table while the two bodies are in motion. Assume the table does not move. I attempt to find out all the forces acting. There's...

This is my problem: A window washer pulls herself upward using the bucket-pulley apparatus The mass of the person plus the bucket is 70 kg. A) How hard must she pull downward to raise herself slowly at constant speed?...N (b) If she increases this force by 9%, what will her acceleration...

I am searching for a book that describes with depth the history of physics from Galileo, Newton, etc. to Einstein, especially the formulation of the principle of relativity and the laws of motion. Most of the treatments of the subject I am aware of (mainly internet sites), do not point out the...

Hi, I have a question about a basic principle of physics: the laws of motion. If two identical buses were traveling towards each other at a speed of 40 mph, assuming a lot of things are constant, their resulting motion in either direction would be 0, correct? Is this principle the...

This is probably really easy, but I can't figure out what to do. A man of mass 80kg (W= 176 lb) jumps down to a patio from a window ledge .50m (1.6ft) from ground. He doesn't bend his knees on landing so his motion is arrested in a distance 2.0cm (.79in) What is the acceleration of the man...