Saturday, September 7, 2019
Physical Science Assignment Example | Topics and Well Written Essays - 500 words
Physical Science - Assignment Example One such misconception is that the lakes and oceans are blue because they reflect the skies above. This is actually wrong. To address such misconception, the facts have to be stated clearly. In this case, it must strongly mentioned that the color of water is blue and not the reflection of clouds (Susan 57). In a completely uniform gravitational field, if there are no other forces, the gravitational forces exerts pressure on both sides of the body equally. This renders the object weightless, a condition that is also experienced when the gravitational field is zero. A body in free fall thus experiences zero gravity ( 0-g). An object dropped from the balcony of a building would be an example of a free fall (Susan 103) The terminal velocity also referred to as settling velocity of a falling object is the velocity of the object when the downward force of gravity (FG) acting on the object equals the sum of the drag force (Fd) and buoyancy . Since there is a zero net force on such an object, the object is said to have zero acceleration (Susan 57). As an object increases the speed, the drag force acting on the object, as a result of the substance it is passing through say air or water increases. The drag or force of resistance will eventually equal the gravitational pull on the object at some. At this exact point onwards, the object ceases to accelerate but rather falls at a relatively constant speed. The constant speed is referred to as terminal velocity. The drag force is pegged on the projected area. This explains why items with large projected areas relative to their mass, such as parachutes, have a lower terminal velocity than objects with a small projected area relative to mass, such as an arrow that has been shot (Susan 57) It means that I have about a total of 2635.3215 pounds of force pushing on my back at any other time.