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NEWTON’S LAWS PROBLEMS WORKED OUT First Law of Motion 1. Zero 2. W=mg = (109,000 kg)(9.80 m/s2) = 1,070,000 N The force acting on the plane due to its weight is 1,070,000 N. 3. Because the plane is not moving in the vertical direction, the lift force is equal to the force due to its weight, 1,070,000 N. 4. Because the plane is traveling at a constant speed, the thrust equals the drag. Thus, the drag force is 104,525 N. 5. Slow down 6. If a person does not have their seatbelt on during the accident, then there is no force holding the person back in their seat. The inertia of the person keeps the person moving in the direction of the car’s original movement. As a result, the person will be thrown with the same speed of the car before impact. Since the car is no longer moving, the person will collide with some part of the car and be injured. Second Law of Motion 1. If F1 = F2 and m1 < m2 , then a1 > a2. 2. (a) aave = Dv Solutions Dt =vf −vi tf −ti = 0 m/s−85.0 m/s 30.0 s = −2.83 m/s2 The negative acceleration indicates that the plane is slowing down. (b) F=ma = (10,000. kg)(2.83 m/s2) = –28,300 N The negative force indicates that the force is acting in the opposite direction of the plane’s movement. 82PDF Image | NASA Guide to Engines
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