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A 100 N flower pot is hanging from the end of a 200-N 1.0 m long beam. The situation is represented with a force diagram

y. 30 o. x. ½ m. A 100 N flower pot is hanging from the end of a 200-N 1.0 m long beam. The situation is represented with a force diagram. The same situation is described mathematically: St = _100 N(1 m) _200 N (1/2 m) _ (1/2 m) sin 30.

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A 100 N flower pot is hanging from the end of a 200-N 1.0 m long beam. The situation is represented with a force diagram

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  1. y 30o x ½ m A 100 N flower pot is hanging from the end of a 200-N 1.0 m longbeam.The situation is represented with a force diagram. The same situation is described mathematically: St= _100 N(1 m) _200 N (1/2 m) _ (1/2 m) sin 30 What are the missing signs in this statement? 1 + – – 2 – – – 3 – – + 4 + + + 5 + – +

  2. 30 cm 70 cm You are pushing down on one end of a beam. A 1.0-kg block hangs from the other end. The beam is in equilibrium. Which mathematical descriptions below match the picture above? a SFy = 0 = - 10N+ FHAND ON BOARD b SFy = 0 = - 10N- FHAND ON BOARD + FPIVOT ON BOARD c St= 0 = (10 N)(30 cm) – FHAND ON BOARD(70 cm) d St= 0 = (10 N)(30 cm) – FHAND ON BOARD(100 cm) • a, c 2 a, d • 3 b, c 4 b, d

  3. Four people, a defensive end for the scarlet knights, a cheerleader, a 5 year old sports fan, and a baby are all on a diving board at the local pool. The torque on the board due to each person is the same. What picture shows the position of the people to best match the above? 1 2 4 3

  4. A B C D A block hangs on a mass-less meter stick supported by two scales. The situation is described mathematically: SFy= 0 = Tleft support on beam + Tright support on beam – Fblock string on beam St= F block string on beam (1/4 L) – Tright support on beam L = 0 A student’s picture is shown with one block in the correct position. Which block is that? 1 A, located at 1 / 4 m to the right 2 B, located at 1 / 3 m to the right 3 C, located at 1 / 2 m to the right 4 D, located at 3 / 4 m to the right

  5. The drawbridge at Camelot castle is used to help keep invaders out. A group of invaders rapidly and the bridge is raised. One invader jumps on and holds on to the bridge. y 1 2 5 x 4 3 A student drew a free body diagram of the situation. Identify the forces represented correctly. 1 2, 4 2 1, 3, 4 3 2, 3, 4 4 1, 3, 5 5 2, 3, 5

  6. A sign hangs on the side of a building, as shown below. What free-body diagram represents this situation? 2 1 2

  7. A balance with moveable pans is shown in the picture below. Which statement below is incorrect? 1 The location of the red boxes on the pans will make a difference in how the beam tilts. 2 The length of the rope connecting the pans to the balance will effect how the beam tilts. 3 If the block on the left is removed, then the two pans could still be balanced. 4 If the base is moved at an angle, then the pans will no longer balance.

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