forces

  1. A

    Which book should I use for mechanics?

    As far as Newtonian Mechanics is concerned, I always had a hard time with it. Then, after some time, I got a book which is quite famous, Newtonian Mechanics by A.P. French . This is book is very nice, I'm understanding each and every thing from it. But the problem comes when I get something like...
  2. O

    internal forces when steam bending wood

    Hi all, first of all is this the most appropriate forum of the many options to pose some questions relating to the forces created when wood steam bent . I understand the practical aspects but I cant get the relevant maths to tally, a few facts first .. when bending the wood the...
  3. O

    internal forces when steam bending wood

    Hi all, first of all is this the most appropriate forum of the many options to pose some questions relating to the forces created when wood steam bent . I understand the practical aspects but I cant get the relevant maths to tally, thanks I post the qu. when I know where to post .
  4. H

    Equilibrium Of Forces

    Help me on this question; I don't get the answer and I keep obtaining 92cm. Maybe I don't draw the diagram well or something. A uniform horizontal beam AB of mass 15kg and length 2m rest on a fulcrum at F distance x from A. Masses of 2kg, 3kg, 4kg and 5kg are hung at C, D, G and H, which are...
  5. J

    Turning Effect of Forces

    I was solving some online physics question papers. Can anyone explain, what is Turning Effect of Force? & also guide me how to solve this: A uniform beam of 1 m is supported at the 50 cm mark. Given that a weight of 2 N hangs at the 30 cm mark, how far away from the pivot must another weight...
  6. H

    Pull Forces - Angles

    We have a system where we are pulling a hose on some rails, but are struggling to find the perfect angle to have the rails. I thought I should be able to work out the best angle mathematically before buying initial metal work prototypes. How would you go about finding the resultant force that...
  7. S

    Magnitude and sense of the force applied at A to reduce the reaction at A to zero.

    Magnitude and sense of the force applied at A to reduce the reaction at B to zero. A light horizontal beam $AB$, of length $9m$, supported at its ends by a force $S$ acting vertically and a force $R$ acting at an angle $\alpha$ to the line of the beam. A force of $30N$ is applied to the beam...
  8. H

    moments & forces with spring balance

    Hello All see the image of the caravan .if it is attached to a car, the caravan according to the safety regulations should exert a force of 690 N (6,9x 100 N) exerting downward on the car's tow hitch. Before the person fastens the caravan, he checks the magnitude of the force by holding...
  9. P

    Forces on a rain droplet

    Hi! Please excuse my lack of understanding on a subject that may be "common knowledge". I'm trying to figure out how much air pressure is required to move a falling rain drop, if at all possible. How many cm/metres off it's original trajectory is it possible to move a falling rain drop, and...
  10. V

    Knowing which forces have 0 moment with respect to a point

    In the figure, A is a point on the bottom right corner of the block. P and W have non-zero moments with respect to A but why does N have a 0 moment at A?
  11. S

    Forces - Braking force

    Hi Ive got this question, part a and b isnt a problem. I have no idea how to work out the braking force though. Any help is appreciated Thanks Steve
  12. S

    Mechanics: Moments of forces, weight and tension.

    A hoop of weight 20 Newtons can rotate freely about a pin fixed in a wall. A string has one end attached to a pin, runs round the circumference of the hoop to its lowest point, and is then held horizontally at its other end. A gradually increasing horizontal force is now applied to the string...
  13. Y

    need help with couple of forces

    https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash3/995557_446100758828643_1511337416_n.jpg Refer the image please. See the figure. The gray structures are made of concrete and the blue lines are strengthened cables. An engineer designs this platform for a shop to place a car. The owner of...
  14. P

    another geometry forces problem...

    these geometry problems are so hard.. Q: determine the resultant size and direction for this force using analytical solution method
  15. P

    Geometry and forces help!

    Hello again =) thx so much for the help with my previous problems, here is another one I don't understand =) Q: determine the size of the the resultant and direction.
  16. P

    How to use Forces?

    Hello! this is the first time they tell us how to use cos sin and tan( cos^-1...) in school, so please do simple math or i will not understand,, and sorry for my paint '' skills '' :)
  17. S

    Resolution Of Forces

    Heya, Have problems with some resolution of forces. Beam length = 6m I've worked it out but I have a feeling I'm well off.. Hoping someone could check my workings as follows: CM = (20x1.5) + (30x3) + (20x4.5) = 210 210/6 = 35kN = R2 ACM = 70 - 35 = 35kN R1 AB - 35 = AB...
  18. R

    Two forces p = 50N and Q = 30 N

    Hi all Two forces p = 50N and Q = 30N are acting simultaneously at point . What is the resultant of these forces , if the angle between them is 60 degree ? R = root F1 + F2 + 2F1F2cos60 R = 70 Now I want find direction which fourmal i use and why ? tan = F1sinQ/F2+F1cosQ or tan =...
  19. F

    Forces

    Hi! Can someone help me please.. I've been solving this problem for hours and i cant get it. A 2.5g bullet traveling at 350m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12cm into the tree's trunk. What force was exerted on the bullet in bringing it to rest...
  20. F

    forces coefficient help!

    The question: The driver of a 1.2X10^3 kg car travelling 45 km/h on a slippery road applies the brakes, skidding to a stop in 35 m. Determine the coefficient of friction between the road and the car tires. the answers i get was negative coefficient but someone says it cant be negative. can...