PPT-Motion, Force, and Speed!

Coach Dave Edinger J C Booth Middle School Physical Science 8A Motion An object is in motion if its distance from another object is changing A reference point is a place or object used to determine if something is in motion. What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. Circular motion. We will be looking at a special case of kinematics and dynamics of objects in uniform circular motion (constant speed). Cars on a circular track (or on a curved road). Roller coasters in loop. - Class . 13. Today:. Dynamics . in Two Dimensions. . Dynamics of Uniform. Circular Motion. Fictitious. Forces. Pre-class Reading Quiz. (Chapter. 8). Last day I asked at the end of class:. A ball is whirled on a string in a vertical circle. As it is going around, the tension in the string is. Interaction forces. Forces arise from an interaction between two objects. They come up in pairs. Each force in an interaction pair acts on a different object. The forces are equal in size and opposite in direction. What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. Calculate angular speed in radians per second.. Calculate linear speed from angular speed and vice-versa.. Describe and calculate centripetal forces and accelerations. .. Motion . in Circles. We say an object . 1. A system of objects that are not moving with respect to one another. Used to determine the motion of an object.. Frame of Reference. 2. If you were measuring the length of a lunch tray you would most likely label it with the following unit.. What is motion?. Motion . is . when an object changes its . position. .. Motion . can be represented mathematically through calculations of . speed, velocity, and . acceleration. Motion is . when an object changes its position. Uniform Circular motion. For an object moving on a circle at constant speed. The . speed is constant. , but the . direction is not. Acceleration is a change in velocity, but speed is constant. The change in velocity is only in its direction. 1. Changing Units. Speed of a car is 80 miles/hour. What is it in m/s. Multiply by 1 so units cancel and correct units are left. In units of m/s: {80 miles * (5280 feet/mile)*(1 m/3.28 feet)}/hour. Section 1.1 An object in motion changes position. Position describes the location of an object.. The . position. , or location, of an object is described relative to a reference point.. The choice of reference point affects how the position is described.. Forces and Motion Chapters 11-12 Frame of reference A system of objects that are not moving with respect to one another To describe motion accurately and completely, a frame of reference is necessary. What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. the . process of moving . or . changing . places . or position. Anything you do while moving is motion.. Fact: Speed is a major type of Motion. Determining motion. In order to determine motion you must know direction and speed.