Determine the net force needed to bring a car that is traveling at 90 km/h toa full stop in a distance of 100 m. The mass of the car is 1400 kg. We begin the analysis by first changing the units of speed to m/s and thenuse as shown to analyze the problem. work, = mv; -mv;13.11-2where m is the mass of the object and V, and V, are the speed of the objectat positions 1 and 2, respectively. To better demonstrate Equation (13.1),consider the following example. When you push on a lawn mower, which isinitially at rest, you perform mechanical work on the lawn mower and move it,consequently changing its kinetic energy from a zero value to some nonzerovalue. (km ){ 1h }1000 m90h {3600 s jl 1 kmV, = V25 minitialV2= V.= 0tinalwork, , = (force)(distance) = -mV? --mv?(force)(100 m) = 0 -;(1400 kg)|25kel/25force = -4375 N

Given data: initial speed (V1) = 90 km/h Full stop distance = 100 m mass of car = 1400 kg

Answered: work, = mv; -mv; 13.1 1-2 where m is…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Determine the net force needed to bring a car that is traveling at 90 km/h to
a full stop in a distance of 100 m. The mass of the car is 1400 kg. We begin the analysis by first changing the units of speed to m/s and then
use as shown to analyze the problem.

work, = mv; -mv;
13.1
1-2
where m is the mass of the object and V, and V, are the speed of the object
at positions 1 and 2, respectively. To better demonstrate Equation (13.1),
consider the following example. When you push on a lawn mower, which is
initially at rest, you perform mechanical work on the lawn mower and move it,
consequently changing its kinetic energy from a zero value to some nonzero
value.

(km ){ 1h }1000 m
90
h {3600 s jl 1 km
V, = V
25 m
initial
V2
= V.
= 0
tinal
work, , = (force)(distance) = -mV? --mv?
(force)(100 m) = 0 -;(1400 kg)|25
kel/25
force = -4375 N

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