determine F1 and F2 by setting up equations based on the following: a) Figure 4.1a: F1 and F2 (perpendicular to beam ) are positioned such that the beam balances horizontally ; L1 = 1.8m and L2 = 2.7m b) Figure 4.1b: 10N is added to F2; perpendicular forces are positioned such that the beam balances horizontally; Lx = 1.2 m and 0.9m

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”