Window Help ● 画 (.e* らテ achapter-2-Kinematics-Discu Discu... a-search in Search in Document OFF Insert Draw Design Layout References Mailings Review View Share 个ー Chapter 2: Mechanics Acceleration 14. Accelerating objects are objects that are changing their velocity. Identify the three ways an object can accelerate. 15. If an object is NOT accelerating, then one knows for sure that it is... at rest slowing down c. maintaining a constant speed d. maintaining a constant velocity a. b. 16. As a roller coaster starts down a hill, its speed is 3 m/s. However, 5 seconds later, at the bottom, its speed is 28 m/s. Calculate its average acceleration. 17. A car is traveling in a straight line along a highway at a speed of 20 m/s. The driver steps on the gas pedal and, 3 seconds later, the car's speed is 32 m/s. Find the average acceleration of the car Acceleration as a Vector Quantity Acceleration, like velocity, is a vector quantity. To fully describe the acceleration of an object, one must describe the direction of the acceleration vector. A general rule of thumb is that if the object is moving in a straight line and slowing down, then the acceleration is in the opposite the direction the object is moving. If the object is speeding up, the acceleration direction is the same as the direction of motion 18. Read the following statements and indicate the direction (up, down, right, left, east, west, north, south) of the acceleration vector A car is moving eastward along Penn Avenue an increasing its speed from 25 mph to 45 mph. a. b. A northbound car skids to a stop to avoid a wreck c. An Olympic diver slows down after splashing into the water d. A southward-bound free kick delivered by the opposing team is stopped by the goalie. A downward falling parachutists pulls the chord and rapidly slows down. A rightward moving Hot Wheels car speeds up e. f. Page 5 of 7 1821 words English (United States) 2

College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter2: Kinematics
Section: Chapter Questions
Problem 4CQ: A student writes, "A bird that is diving for prey has a speed of -10 m / s." What is wrong with the...
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