# R3 - Reinforcement Question Chapter 3 : Dynamics 1 A...

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1 Reinforcement Question Chapter 3 : Dynamics 1 A 1.00-kg object is observed to have an acceleration of 10.0 m/s 2 in a direction 30.0° north of east (Fig.1). The force F 2 acting on the object has a magnitude of 5.00 N and is directed north. Determine the magnitude and direction of the force F 1 acting on the object. [8.66 N to the east] 2 Two objects are connected by a light string that passes over a frictionless pulley, as in Figure 2. Draw free-body diagrams of both objects. If the incline is frictionless and if m 1 = 2.00 kg, m 2 = 6.00 kg, and θ = 55.0°, find (a) the accelerations of the objects, (b) the tension in the string, and (c) the speed of each object 2.00 s after being released from rest . [ a = 3.57 ms -2 , T = 26.7 N, v f = 7.14 ms -1 ] 3 Three objects are connected on the table as shown in Figure 3. The table is rough and has a coefficient of kinetic friction of 0.350. The objects have masses of 4.00 kg, 1.00 kg, and 2.00 kg, as shown, and the pulleys are frictionless. Draw free-body diagrams of each of the objects. (a) Determine the acceleration of each object and their directions. (b) Determine the tensions in the two cords. [a = 2.31 ms

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## R3 - Reinforcement Question Chapter 3 : Dynamics 1 A...

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