1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate the force of a spring

  1. Oct 7, 2006 #1
    Introduction and Question:

    You are designing a delivery ramp for crates containing exercise equipment. The crates weighing 1490 N will move at a speed of 1.80 m/s at the top of a ramp that slopes downward at an angle 21.0^\circ. The ramp exerts a kinetic friction force of 540 N on each crate, and the maximum static friction force also has this value. Each crate will compress a spring at the bottom of the ramp and will come to rest after traveling a total distance of 7.60 m along the ramp. Once stopped, a crate must not rebound back up the ramp.

    Calculate the force constant of the spring that will be needed in order to meet the design criteria.

    I am stuck on this only because I cannot extract from this data the distance the spring compresses. Can someone please offer some insight?
  2. jcsd
  3. Oct 7, 2006 #2


    User Avatar

    Staff: Mentor

    Possible one is to use two equations, with two unknowns, k and x.

    One is the force equation and the spring force, Fsping = kx, and the other equation is an energy equation, in which the spring stored energy is Esping=1/2 kx2.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?