Ask Experts Questions for FREE Help !
Ask
    Prostaff's Avatar
    Prostaff Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Apr 27, 2012, 05:21 AM
    A car weighs 1000Kg and the driver applies the brakes with a force of 400N.
    Its physics. I got an answer but I'm not sure if I'm right
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
    		  
    #2

    Apr 27, 2012, 06:02 AM
    Quote Originally Posted by Prostaff View Post
    Its physics. I got an answer but I'm not sure if I'm right
    Your question got cut off - what are you trying to calculate, the car's rate of deceleration? Also - please tell us what answer you got and how you arrived at it, and we can tell you whether it's correct or not.
    Prostaff's Avatar
    Prostaff Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Apr 27, 2012, 09:27 PM
    Quote Originally Posted by ebaines View Post
    Your question got cut off - what are you trying to calculate, the car's rate of deceleration? Also - please tell us what answer you got and how you arrived at it, and we can tell you whether it's correct or not.
    Yeah, I'm trying to find the car's rate of deceleration. I got
    Time=2.5
    Velocity due to gravity=10m/s
    So deceleration=-(0-10/2.5)=4m/s^2
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
    		  
    #4

    Apr 30, 2012, 05:46 AM
    To find the acceleration of the car use F=ma: F is the force applied by the brakes in the direction opposite of travel (hence is a negative number), and m is the mass of the car. So from F=ma you can rearrange to get: a = F/m = -400N/1000Kg.

    Why diid you include 'g' (acceleration due to gravity? For a car on a level road (which I assume this is) gravity acts perpendicular to the direction of motion and hence has no effect on the car's acceleration.
    Prostaff's Avatar
    Prostaff Posts: 4, Reputation: 1
    New Member
    		  
    #5

    May 1, 2012, 02:18 AM
    Quote Originally Posted by ebaines View Post
    To find the acceleeation of the car use F=ma: F is the force applied by the brakes in the direction opposite of travel (hence is a negative number), and m is the mass of the car. So from F=ma you can rearrarnge to get: a = F/m = -400N/1000Kg.

    Why diid you include 'g' (acceleration due to gravity? For a car on a level road (which I assume this is) gravity acts perpendicular to the direction of motion and hence has no effect on the car's acceleration.
    Thanks for the reply. I understand it now, it was on my test and I obviously screwed it up. Thanks though
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Car accident with a borrowed car that has insurance, but the driver has no license? [ 1 Answers ]

What will happen when there's a car accident, but the driver has no license. There is insurance on the car. The driver was cited. What will happen if there's no damage at all on either vehicle? It was a minor rear-ender. What will happen in Texas?

Car accident, insuranced car with non-covered driver, other driver injured, suing... [ 2 Answers ]

I got into a car accident in a intersection with stop sign on my side. I stopped at the stop sign, checked left and right and then tried to pass the avenue but unluckily got hit by another female driver. My car (my girlfriend's actually) turned 180 degrees the opposite side after the accident. I...

Nellie Newton applies a force of 50 n to the end of a lever, which is moved a certain [ 3 Answers ]

Nellie Newton applies a force of 50 n to the end of a lever, which is moved a certain distance. If the other end of the lever moves one-third as far, show that the force it exerts is 150 n.

How could we calculate the magnetic force for lift and hold a weight of 1000kg. [ 1 Answers ]

Dear Answerer! What are the formulas for calculating the magnetic force?How could we maintain the force of a permanent magnet?For lifting and holing up a weight by a permanent magnet, what are the formulas and sequences? If we need to have two permanent magnet with the same physical dimension but...

Car accident -driver in front put her car in reverse and smashed me [ 2 Answers ]

I was sitting in my car at a red light. Traffic was heavy-ish. Suddenly- very suddenly and out of nowhere my car and the car in front of me collided with an enormous impact. I was stunned. I was shocked and confused. Prior to impact my car was absolutely stationary! My chest area ( heart) ,...

View more questions Search