An object of mass  m = 0.380 kg  is suspended from the ceiling of an accelerating truck as in the figure below. Take  a = 2.60 m/s2.   A truck is accelerating to the right, as indicated by an arrow labeled vector a. A small sphere of mass m is suspended from the ceiling of the truck by a string. The string makes an angle ? with the vertical, and the mass hangs to the left of the vertical. (Truck image) (a) Find the angle ? (in degrees) that the string makes with the vertical.  ° (b) Find the tension T (in N) in the string.  N What If? The truck returns to a constant velocity so that the mass hangs straight down inside the truck, whereby  ? = 0.  Later, the truck carefully slows down. During this braking maneuver, the string is observed to make a constant angle of  ? = 23.0°  with the vertical. (c) What is the acceleration of the truck (in m/s2) while it is braking?  m/s2 (d) What is the direction of the deflection of the string while the truck is braking? forwardbackward

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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.