Learning Goal: To understand how to quantitatively determine whether a particle is in a state of mechanical equilibrium. As shown, three forces, F1, F2, and F3, act at the same point on an object. (Figure 2) The point of application is the origin of a Cartesian coordinate system. F1, which has a magnitude of F1 = 20.0 kN , is in the y-z plane and is described by an angle B1 = 34.0 degrees . F2 is in the x-z plane and is described by integer lengths of a similar right triangle; its magnitude is F2 = 25.0 kN. If the sum of the forces is equal to zero, what is the magnitude of F3? Express your answer numerically in kilonewtons to three significant figures. In statics, we make extensive use of Newton's first law, which states that a particle, initially at rest, or moving in a straight line with constant velocity, will remain in its current state unless the particle is subjected to an unbalanced force system. If the sum of the forces acting on a particle is zero, then it is in mechanical equilibrium. Although a particle is most likely at rest when in equilibrium, it could alternatively • View Available Hint(s) F3 = 28.5 kN Submit Previous Answers Figure 1 of 3 > Correct Part C F2 What are the angles a3, B3, and y3 for the force F3 = 23.1i+(-16.6j)+(1.57k) in Part B? (Figure 3) Express your answers numerically in degrees to three significant figures separated by commas. • View Available Hint(s)

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Gravitational force

In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.

Acceleration Due to Gravity

In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.