Only one position co-ordinate is required to describe the position of the particle in this motion. This type of motion is also called rectilinear or linear motion. Motion that changes the orientation of a body is called rotation. PROJECTILE MOTION We see one dimensional motion in previous topics. (4) Example of sewing machine – The swing machine has a wheel which rotates on an axle. We can have different types of projectile type. In this type of motion gravity is the only factor acting on our objects. So, the wheel of a sewing machine shows rotational motion. Motion, in physics, change with time of the position or orientation of a body. For example, you throw the ball straight upward, or you kick a ball and give it a speed at an angle to the Uniform motion can be described by a few simple equations. Examples (i) Motion of a vehicle on a straight line. The distance s covered by a body moving with velocity v during a time t is given by s = vt. Classical mechanics is the branch of physics that studies motion. Motion along a line or a curve is called translation. The motion of a body is said to be in one dimension or one –dimensional motion if it moves along a straight line in any direction. If the velocity is changing, either in direction or magnitude, it is called accelerated motion … Students will distinguish between and/or interpret the types of motion. Now, we will try to explain motion in two dimensions that is exactly called “projectile motion”. The study of classical mechanics is quite expansive and includes the study of motion at the nanoscale and microscopic level (protein folding, enzymes) macroscopic level, all the way to the motion of aviation crafts, planets and … In the above figure, different locations of the object during its In both cases all points in the body have the same velocity and the same acceleration. So, a bicycle moving on a straight road has two types of motion rotational motion as well as rectilinear motion. Uniform motion is motion at a constant speed in a straight line.