# Chapter 11 Science- Motion

Total word count: 519
Pages: 2

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 Motion the change in position of one object in relation to the position of some fixed object/ Distance a measure of the total length along a path between two points. Displacement a measure of both length and the direction of an object’s path from its starting point straight to its ending point. Speed the rate at which an object changes position. Speed differ from Velocity Speed: the ratio of the distance an object moves to the amount of time the object moves Velocity: the speed and direction an object is moving, measured to a reference point Acceleration the rate of change in velocity. Two Examples of Acceleration Free falling, and a rocket launch Reference Point To identify an objects position, you must compare its location with that of another object or place. That other object or object is called.. Straight lines Distance between reference points and other locations can be measured in … It Has Experienced Motion When an object changes position over time, speed describes how quickly an object changes position. Speed= Distance/Time Distance-time graph A convenient way to show the motion of an object is by using a graph that plots the distance the object has traveled against time. This is called a… A change in Velocity a change in either speed or direction results in… Because velocity includes direction, it is possible for two objects to have the same speed but different velocities. What velocities include Speed and direction. To determine ________ of an object, you need to know both its speed and its direction. How acceleration is measured How quickly the velocity is changing. If velocity does not change there is no _____________. Acceleration= Final Velocities-Initial Velocity/Time Speed up or slow down The direction of the acceleration determines whether an object will…. Deceleration Negative acceleration is called ________. This means the object is slowing down. How Velocity-time graphs and distance-time graphs are related Both graphs are related because the distance an object travels depends on its velocity. Deceleration= Initial Velocity-Final Velocity/Time Velocity= Distance/Time in a given direction Velocity The speed and direction an object is moving, measure relative to a reference point Velocities in the same direction two objects moving the same direction velocities in opposite directions two objects moving opposite directions Relative Motion movement in relation to a frame of reference Vector a quantity that has a direction associated with it Resultant Vector the vector sum of two or more vectors Instantaneous Speed the rate at which an object is moving at a giving moment in time Average Speed the total distance traveled divided by the time it takes to travel that distance Constant Acceleration a steady change in velocity Linear Graph a graph in which the displayed data from a straight line Nonlinear Graph a graph in which the displayed data from a curved line Three Changes in acceleration change in speed, direction, and both The upright slope of a speed-time graph the point on the graph that represents acceleration The downward slope of speed-time graph the point on the graph that represents deceleration No movement A straight line on the graph represents..

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