trailer provide the largest possible to slide. Knowing that the coefficient of static friction is 0.75, deter- mine (a) the shortest time for the rig to a come to a stop, (b) the force in the coupling between the two trailers during that time. Assume that the force exerted by the coupling on each of the two trailers is horizontal. 90 km/h 4500 kg 3600 kg 2000 kg 00 00 00 Fig. P13.131 13.132 The motor applies a constant downward force F = 550 lb to the cable con- nected to the 4000-lb elevator E shown in the figure. The counterweight has a weight of W = 3000 lb. Knowing that the elevator starts from rest, determine the time when the velocity of the elevator will be 3 m/s. Fig. P13.132 13.133 An 8-kg cylinder C rests on a 4-kg platform A supported by a cord that passes over the pulleys D and E and is attached to a 4-kg block B. Knowing that the system is released from rest, determine (a) the velocity of block B after 0.8 s, (b) the force exerted by the cylinder on the platform. 13.134 An estimate of the ornooto

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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.