The rocket sled shown in the figure accelerates to the right at a rate of 68.6 m/s². Its passenger has a mass of 62 kg. Consider: The passenger pushes the back of the seat and the bottom of the seat. The resultant of the two forces is the net force of the passenger on the seat. Do they experience a reaction force from the seat? What force is responsible for his horizontal acceleration? (a) Calculate the horizontal component of the force F, the seat exerts against his body. F₁=ma= N (b) Compare this with his weight by using a ratio. Fn V W (c) Calculate the vertical component of the force N the seat exerts against his body. N= N (d) Calculate the direction and magnitude of the total force the seat exerts against his body. Give the angle as measured above the horizontal. 0= F net degrees N I
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.
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