There is a contradiction between the concept of the slope of the V-t graph (acceleration by mathematical slope curve) and the real meaning of "Speeding Up" and "Speeding down" acceleration !! In slide "3" : The line number 9 is speeding up ( which means positive acceleration) , while In slide "5" it is mentioned that line number 9 is a NEGATIVE Acceleration !! Could you explain please this contradiction ?? Is n't Negative Acceleration means in Kinematic that the body is speeding down ???
The issue has to do with your definition of acceleration direction. In your mind, "slowing down" (getting slower) is negative acceleration and "speeding up" (getting faster) is positive acceleration. That is the error.When objects decrease their speed ("Slow down"), the acceleration direction is the opposite direction as the object is moving. So an object moving in the negative direction and slowing down is accelerating in the positive direction; that is to say, it has a positive acceleration. And when objects increase their speed ("speed up"), the acceleration direction is in the same direction as the object's motion. So an object that is moving in the negative direction and increasing speed ("Speeding up") has a negative acceleration. Hope that helps.
Bro couldn’t be any faster at explaining
I swerrrrr
units for acceleration are still incorrect at 8:10
They are.
There is a contradiction between the concept of the slope of the V-t graph (acceleration by mathematical slope curve) and the real meaning of "Speeding Up" and "Speeding down" acceleration !!
In slide "3" : The line number 9 is speeding up ( which means positive acceleration) , while In slide "5" it is mentioned that line number 9 is a NEGATIVE Acceleration !!
Could you explain please this contradiction ??
Is n't Negative Acceleration means in Kinematic that the body is speeding down ???
The issue has to do with your definition of acceleration direction. In your mind, "slowing down" (getting slower) is negative acceleration and "speeding up" (getting faster) is positive acceleration. That is the error.When objects decrease their speed ("Slow down"), the acceleration direction is the opposite direction as the object is moving. So an object moving in the negative direction and slowing down is accelerating in the positive direction; that is to say, it has a positive acceleration. And when objects increase their speed ("speed up"), the acceleration direction is in the same direction as the object's motion. So an object that is moving in the negative direction and increasing speed ("Speeding up") has a negative acceleration. Hope that helps.
Why are the answers in the "Your Turn to Practice" not 2.0 m/s/s and -2.0 m/s/s. The video shows m/s not m/s/s but acceleration should be m/s^2.
The unit for acceleration should be m/s/s. I'll have to give the video a review. Thanks for the heads up.
When we're picking points to calculate the slope,do just pick any points
Any point will work as long as it is on the line. Best points are those whose coordinates are xlearly known.