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PHYS 100 Chapter 2.4: CHAPTER 2.4-2.5

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scarletcicada217
29 Dec 2016
School
Simon Fraser University
Department
Physics
Course
PHYS 100
Professor
Firuz Demir

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Document Summary

The ratio of vx/ t is the rate of change of velocity. The ratio of vx/ t is the slope of a velocity-versus-time graph: this is defined as acceleration. An o(cid:271)je(cid:272)t"s a(cid:272)(cid:272)eleration is the slope of its velo(cid:272)ity-versus-time graph. Whether or not an object that is slowing down has a negative acceleration depends on whether the object is moving to the right or to the left, or whether it is moving up or down. A horizontal line in a graph indicates a constant acceleration. Velocity equation for an object with constant acceleration: (vx)f=(vx)i+ax t. Relating velocity and displacement for constant-acceleration motion: (vx)f. Describing the motion in one dimension (tables on pg 47) Position equation for an object with constant acceleration: xf=xi+(vx)i t+0. 5ax( t)2. Two quantities are said to have a quadratic relationship if y is proportional to the square of x.

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Related Questions

An object that moves along a straight line has the velocity-versus-time graph shown in the figure below. At time t = 0, the object has position x = 0.

a. At time t = 5 s, is the acceleration of the object positive, negative, or zero?

b. At time t = 8 s, is the object speeding up, slowing down, or moving with constant speed?

c. Write an expression for the position of the object as a function of time. 

d. Use your expression from part (c) to determine (if any) at which the object reaches its maximum position. 

1- Define velocity and acceleration in terms of position and time.differentiate between the instantaneous quantities and the averagequantities.

2- how are average velocity and instantaneous velocity related foran object moving at constant and non constant velocity?

3-how would you expect the graph of position versus time to lookfor a car moving at constant and non constant velocity on a track?explain how the graph would be?

4- what would a graph of instantaneous velocity versus time looklike for a car moving with constant velocity? or a car speeding up?or if the car is slowing down?

your help is much appreciated.

1. A ball rolls up then down an incline. Sketch an acceleration diagram for the entire motion. 

2. Sketch x versus t, v versus t, and a versus t graphs for the entire motion of a ball rolling up and then down an incline.

a. Use a coordinate system in which the positive x-direction is down the track.

b. Use a coordinate system in which the positive x-direction is up the track.

c. Can an object have a negative acceleration and be speeding up? If so, describe a possible physical situation and a corresponding coordinate system. If not, explain why not.