PPT-Velocity and Acceleration

Average speed Speed is a scalar variable Unit length over time ms Instantaneous velocity Speed and direction of object at a particular instant in time Velocity is a vector. Measures How Fast . Velocity . Changes. Motion and Forces Unit Chapter 1 Section . 3. 1. Speed and Acceleration Can Change with Time. Acceleration. 1. Speed and Acceleration Can Change with Time (answers). 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?. Physics. Turning:. Turning counts as a form of acceleration because the direction of the velocity vector changes.. Turning requires a force that is perpendicular to the current motion of an object.. Equations of Motion for Constant Resultant Force. Also called ….. because………. …acceleration and resultant force are directly proportional. . s. uvat. equations. Also called ….. (unhelpfully). Unit 9.2. m/s. 2. average acceleration. a = . D. v. D. t. 50 m/s – 25m/s. 4s – 2s. = . = . 12.5 m/s. 2. B. C. A. A. C. none. B. n. f. –. . n. i. t. f. –. . t. i. Practice. : A pool ball travelling at 2.5 m/s towards the cushion bounces off at 1.5 m/s. If the ball was in contact with the cushion for 0.20 s, what is the ball’s acceleration? (Assume towards the cushion is the positive direction.). A . vector quantity. is a quantity that has both magnitude and direction. Velocity, acceleration, and force are examples of vector quantities. . A . scalar quantity. is a quantity that has magnitude, but no direction. Time, mass, volume, and speed are examples of scalar quantities.. Describe the speedometer on a car that is entering a highway, drives for 25 miles and then exits the highway.. Consider the two situations below. When a shuttle bus approaches a stop, the driver begins to apply the brakes to slow down 5.0 s before actually reaching the stop. The speed changes from 9.0 m/s to 0 m/s over time.. Describing changes in velocity, and how fast they occur, is a part of describing motion.. How are changes in velocity described?. The rate at which velocity changes is called. . acceleration.. Scientists can perform artificial transmutations by bombarding atomic nuclei with high-energy particles such as protons, neutrons, or alpha particles.. Velocity and acceleration Measuring an objects motion speed Speed is calculated by dividing distance by time S = d/t 5.0 km/h 2.5 m/s 45 mph velocity Velocity is the same as speed, but you tell the direction of motion in the answer. Acceleration is a change in velocity. Speed or direction. Centripetal Acceleration. Acceleration can mean a change in direction, not just speed. Centripetal acceleration. Acceleration that occurs in a circular motion. Acceleration is a measure of . the change in velocity per unit of time. When the velocity of an object is changing, it is . accelerating. Negative acceleration: . slowing down. Positive acceleration: . 2016. Measuring Distance. Meter . – . international unit for measuring distance.. = 50 m. 1 mm. Calculating Speed. Speed. (S) . = distance traveled (d) / the amount of time it took (t). . S = d/t. Displacement: . Is the distance from where you start to where you finish. . Δ. d=. d. f. -d. i. Velocity:. How fast and in what direction (vector quantity). V = ∆d/t. Speed: . How fast (scalar quantity). Lesson . 2. Position with Constant Acceleration. The graph shows that the car’s motion is not uniform: The displacements for equal time intervals on the graph get larger and larger.. The slope of a position-time graph of a car moving with a constant acceleration gets steeper as time goes on..