Static Equilibrium The Hanging Sign Problem Physics Mrs

Static Equilibrium: “The Hanging Sign Problem” Physics Mrs. Coyle

-How do you calculate the tensions in the strings? -How do the angles affect the tensions?

Equilibrium Fnet = 0 a=0 Static Equilibrium: the object is at rest. Dynamic Equilibrium: the object is moving at constant velocity. The Equilibrant is a force that is exerted on the system to bring it to equilibrium.

Example 1 a)Calculate the tension in each string. The mass of the sign is 2 kg and the angles formed between each string and the sign are 300. b)If the angles were 10 o, what is the tension and how does it compare with the answer to a)? Answer: a) T 1 = T 2 = 20 N b) T 1 = T 2 = 58 N

greater? http: //wwwrcamnl. wr. usgs. gov/sws/SWTraining/cableways/design. htm

Do the angles affect the tension? Examples: Telephone or electrical wires. Picture frame wire.

Example 2 T 1 T 2 A sign is suspended as shown above. a) Calculate the tension in each string. b) Which tension is greater T 1 or T 2 and how does that correlate with the angles? Answer: T 1 = 538 N, T 2 = 439 N

Example 3 T 1 T 2 A sign is suspended as shown above. a) Calculate the tension in each string. b) Which tension is greater T 1 or T 2 and how does that correlate with the size of the angles? Answer: T 1 =289 N, T 2 =144 N