Science and Math For Technology
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- Gravity Gravity
- The equation for constant acceleration is:V=V 0 +at
| Science and Math For Technology; Thomas Barrowman © 2001 ISBN: 0-9713542-0-0
Chapter 1: Motion Techno Terms:
Gravity Gravity is the force that pulls things towards the center of the earth. When objects are falling in a vacuum [a space where there is no matter] this pulling force or gravity causes all objects to gain speed at a uniform rate. Starting from rest, free-falling objects increase their speed by thirty-two feet per second g for each second that they fall. The atmosphere surrounding the earth slows down objects that are free-falling. The slowing action is called drag. Use the velocity formula to determine the speed of a falling object when there is no drag. Velocity=(Δd)/(Δt) ΔV-is the velocity Δd-is the change in displacement Δt-is the change in time Velocity is a measure of how far something has travelled from the origin plus direction.or how fast on object travels by a certain rate. Hence Speed =Distance/Time (v=d/t ; where d=distance and t=time). We can define velocity as the rate of change of position. Because it has a direction, it is a vector quantity. The first derivative of position vector (s) with respect to time (t) is also known as velocity we write this as: velocity = ds/dt and ds/dt gives us instantaneous velocity. Furthermore, if s is distance traveled in time t, equals Distance/Time (v equals s/t ; where s equals distance and t equals time) It is measured in units of distance/ units. The equation for constant acceleration is:V=V0+at Read more: http://wiki.answers.com/Q/What_is_the_formula_for_velocity#ixzz1A4iZsKu1 The center of gravity is a point at which the entire weight of an object appears to be centered. An object will balance if it is suspended from, or supported underneath, its center of gravity. Give an example of objects that balance on their center of gravity. An airplane in flight… the air underneath it supports it when in flight. An object spinning freely will turn around its center of gravity. If a body is supported at any other point other than its center of gravity, it will try to move until its center of gravity is as low as possible. A highly stable object has a low center of gravity. Snow cats, bulldozers, all-terrain vehicles, and high performance automobiles all have low centers of gravity.    
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