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Create a FBD that represents the situation below

Create a FBD that represents the situation below. 2 ropes are holding the object up and the object is motionless. F t2 (R, B). F t1 (R, B). F g (E, B). Should the forces be balanced? Yes, because the object is motionless (constant velocity) Therefore, net force = 0.

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Create a FBD that represents the situation below

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  1. Create a FBD that represents the situation below 2 ropes are holding the object up and the object is motionless Ft2 (R, B) Ft1 (R, B) Fg (E, B) • Should the forces be balanced? • Yes, because the object is motionless (constant velocity) • Therefore, net force = 0 But this is different than any of the other problems we have done because for the first time, we’ve encountered a scenario where it’s not completely obvious to the eye exactlyhowthe forces balance Balanced (obvious to the eye) Balanced (not so obvious to the eye)

  2. = • Any vector directed in 2 dimensions can be thought of as having an influence in 2 different directions • Made up of 2 parts • Each part of a 2-D vector is known as a component vector • The combined influence of the 2 components is equal to the influence of the single 2-D vector • Therefore, we can replace the 2-D vector with the component vectors + 2-D force vector (up & to the right) Component vectors 2 horizontal component vectors cancel (balanced) 2 vertical component vectors cancel downward vector (balanced) Much more obvious to the eye how the forces balance

  3. Now try to create the FBD of this situation Object is motionless on an incline • We know that the force should balance since the object is motionless (constant velocity) • Net force = 0 FN (R, B) FN (R, B) Ff (R, B) Ff(R, B) Remember, friction force is parallel to surface Remember, normal force is perpendicular to surface Fg perp. Fg (E, B) Fg parallel Fg (E, B)

  4. We know that the forces must be unbalanced because the problem does not state that the object is going at a constant velocity • We know from past experience that objects going down ramp accelerate • Net force not equal to 0 Object slides without friction FN (T, B) F net = 0 Fg Fg Fg Fg (E, B) • By displaying this, we are 100% sure the force that is responsible for this accelerated motion and in what direction • VERY IMPORTANT FOR OUR UNDERSTANDING OF MOTION!

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