Kinematics

kinematics is defined as the quantitative description of an object's motion.

kinds of Motion motion may be simple if is due to a single forces; or compound, if it is the combined effect of several forces.

Uniform Motion this motion is due to an instantaneous force. it is characterized by a constant velocity, that is, the moving body will pass over equal distance per unit time.
S=vt
where S is the total space or distanced travelled; v, the constant velocity and t, the time.

Steps in Solving Problems in Kinematics

1. illustrate the situation described in the problem. include in the diagram a coordinate axis; the values of known quantities represented in terms of appropriate symbols; a symbol for the unknown quantity you wish to determine.
2. divide the problem in to parts. each part can often be solved with relative ease even though the original problem might have seemed impossibly complicated.
3. fond one of the equation listed earlier in which the only unknown quantity in the equation is the one whose value you wish to calculate.
4. rearrange the equations so that the unknown appears alone on the left and the known quantities on the right.
5. check your work.

GRAVITATIONAL ACCELERATION
-caused the vertical motion of objects thrown into air or of the objects falling through the air. if not for the resistive force of the air on these objects, this acceleration would be constant. this acceleration is caused by the gravitational force of the earth pulling down on objects.
the magnitude of this acceleration has a value at the earth's surface of 9.8m/s2.
g=9.8m/s2
=980cm/s2
=32ft/s2