Pete Bradley
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Apr 8, 2016 · Answer link. Tends to be more of a cultural expression than one of physics - any act that appears to defy what we understand about gravity. Some cultural examples might be: high wire trapeze artists who appear to "defy gravity" or magicians how appear to "defy gravity" by floating someone in mid-air unsupported. In all of these cases, there is ...
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Aug 3, 2018 · Answer link. To the best of my understanding Gravity creates a curve in space time. This causes light to bend and since the velocity of light is a constant time must change because of the bending of space. V = D xx T V = Velocity D = Distance T = Time When gravity causes a curve in space time, the distance that light must travel increases.
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Jul 7, 2014 · A force is any influence which changes the motion of an object. There are two categories of forces: contact forces (when the two interacting objects physically contact each other, such as frictional, tension or normal forces), and forces resulting from action-at-a-distance (when the two interacting objects are not in physical contact with each other, such as the gravitational, electrical or ...
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Jan 27, 2016 · The acceleration of gravity (also referred to as the gravitational field strength) at the surface of the earth has an average of 9.807 m/s^2, which means that an object dropped near earth's surface will accelerate downward at that rate. Gravity is a force, and according to Newton's Second Law, a force acting on an object will cause it to accelerate: F=ma Acceleration is a rate of change of ...
When you release an object from your hand, its speed is zero but on the way down its speed increases because it’s being pulled on by gravity. The longer it falls the faster it travels. They accelerate downwards at a rate of 9.8 m/s/s (often approximated as 10 m/s/s). Free-falling objects do not encounter air resistance.
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May 7, 2018 · According to Newton's third law of motion "for every action, there is an equal and opposite reaction". As a blown up but untied balloon is released, the air trapped inside the balloon pushes out of the open end. This causes the balloon to move forward. The force of the air escaping is the "action"; the movement of the balloon forward is the "reaction".
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Dec 2, 2016 · Whatever the object is resting on is exerting a reaction force that is equal in magnitude but opposite in direction to the force of gravity. If the object in not in equilibrium, then the reaction is the acceleration of the object in direction of the force of gravity. The magnitude is equal to the force of gravity divided by the mass of the object.
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Density is the amount of matter in an object compared to its volume (the amount of space it takes up). If an object were extremely dense, it would feel heavier than another object of the same size that was less dense. For example, a 1-litre soda bottle filled with air would feel much lighter than the same bottle filled with water. Water has a density of 1 kilogram per liter, while air has a ...
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Apr 2, 2016 · Gravity works the same way in water that it works in air or a vacuum -- but you have to consider the force of gravity on the water as well as on the object you put into it. When you put something in water, gravity can pull the object down through the water only if an equal volume of water is allowed to go up against the force of gravity; this is called displacement. In effect gravity has to ...
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Newton's second law states that acceleration of an object is produced when a force acts on a mass. The greater the mass (of the object being accelerated), the greater the force needed to accelerate the object. What that means is that heavier objects require more force than lighter objects to make them move the same distance.
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