Kayla, a fitness trainer, develops an exercise that involves pulling a heavy crate across a rough surface. The exercise involves using a rope to pull a crate of mass M=45.0 kg along a carpeted track. Using her physics expertise, Kayla determines that the coefficients of kinetic and static friction between the crate and the carpet are mu(k)=0.410 and mu(s)=0.770, respectively. Kayla uses one of her employees, Ramon, to test the exercise. If the rope makes an angle of ?=25.0∘ with the floor, what is the minimum force F(min) that Ramon must apply to set the crate in motion? Use g=9.80 m/s2. Next, Kayla has Ramon pull on the rope as hard as he can. If he pulls with a force of F=315 N along the direction of the rope, and the rope makes the same angle of ?=25.0∘ with the floor, what is the acceleration, a, of the box?
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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