# An analysis of the two basic kinds of motion

The velocity can be positive or negative, and is indicated by the sign of our slope. Examples are vehicles moving on a road, a child going down a bird flying in the sky. This scene point has a position relative to the camera, and if this relative position changes, it corresponds to a relative motion in 3D.

A car wheel that has not been balanced properly has a center of mass that does not coincide with its geometrical center. In two-dimensional projectile motion, such as that of a football or other thrown object, there is both a vertical and a horizontal component to the motion.

Objects undergoing periodic motion Non-periodic Motion A motion that does not repeat itself at regular intervals or a motion that does not repeat itself at all is called non-periodic motion.

Table illustrates some of the displacement-time graphs. Airplanes flying straight in air and objects falling vertically down are also the examples of linear motion. It can be helpful to think of the center of mass as the average location of all the mass in the object.

Key Terms kinematic: of or relating to motion or kinematics Projectile motion is the motion of an object thrown, or projected, into the air, subject only to the force of gravity. Walking is thus an example in which there is both a general motion of the whole object and a change in the shape of the object.

Light rays from an object pass through a small hole to form an image. Think of a spinning wheel on which people spun wool. Learning Objectives Analyze a two-dimensional projectile motion along horizontal and vertical axes Key Takeaways Key Points Constant acceleration in motion in two dimensions generally follows a projectile pattern.

As a consequence, if an intensity I has been observed at some point in the image, at some point in time, the same intensity I will be observed at a position that is displaced relative to the first one as a consequence of the apparent motion.

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