Mary and her sister are playing with a cardboard box on the neighborhood hill. Mary climbs into the box, the total mass of the box with Mary in it is 115 kg. The box starts at rest at the beginning of the incline. The hill is at an incline of 28 degrees with respect to the horizontal.The static and kinectic friction between the box and hill is 0.4 and 0.2 respectively. Assume that Mary has begun to slide downhill in the box. (If you find that it should stay at rest at the top of the hill, you can assume that it has been given a brief push to start moving). a. What is the magnitude of the net force acting on the box and child system? b. What is the magnitude of acceleration of the box? c. Compare how the Mary perceives her weight at the top of the hill and as the box slides downhill. As she slides down the hill, does he feel lighter, heavier, or the same as she did at the top?
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.
Mary and her sister are playing with a cardboard box on the neighborhood hill. Mary climbs into the box, the total mass of the box with Mary in it is 115 kg. The box starts at rest at the beginning of the incline. The hill is at an incline of 28 degrees with respect to the horizontal.The static and kinectic friction between the box and hill is 0.4 and 0.2 respectively. Assume that Mary has begun to slide downhill in the box. (If you find that it should stay at rest at the top of the hill, you can assume that it has been given a brief push to start moving).
a. What is the magnitude of the net force acting on the box and child system?
b. What is the magnitude of acceleration of the box?
c. Compare how the Mary perceives her weight at the top of the hill and as the box slides downhill. As she slides down the hill, does he feel lighter, heavier, or the same as she did at the top?
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