An object with weight 50 N is attached to free end of a light string wrapped around a reel of radius 0.25 m and mass 3 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing through its center. The hanging object is released 6 m above floor. Part of the ques. asks me to determine tension in the string, so I drew a free-body diagram, but how can I determine tension with no acceleration?
2007-11-27 16:30:35 · 3 answers · asked by Muffins 1 in Science & Mathematics ➔ Physics
You have TWO basic forces at work in this problem:
The downward force of gravity (50 N) which NORMALLY produces an acceleration of 9.81 m/s^2
The other force, directly opposite and counteracting gravity is the rotational inertia of the disk around which your string is wrapped.
2007-11-27 16:43:47 · answer #1 · answered by rogue74656 2 · 0⤊ 0⤋
An object with no acceleration has zero net force on it. If a string is pulling on the object with some given tension, look for the force that is counteracting this tension. It could be gravity, or another string, or some other force in the opposite direction of the tension exerted by the first string.
2007-11-27 16:36:27 · answer #2 · answered by lithiumdeuteride 7 · 0⤊ 0⤋
You don't need acc. for a FBD, just forces. You need the force of Gravity, not the acceleration.
hope that's a start...
2007-11-27 16:40:32 · answer #3 · answered by Daniel S 2 · 0⤊ 0⤋