how to know if acceleration is positive or negative?
7059
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.
685926
The difference between a positive and a negative integer can be positive or negative. When you subtract a negative integer from a positive integer, the difference is always positive. Note: When you subtract a negative integer, the integer becomes positive.
548880
A positive velocity simply means that the object is moving in the positive direction, as defined by the coordinate system, while a negative velocity means the object is traveling in the other direction.
1101038
Negative Velocity and Positive Acceleration. ... An object which moves in the negative direction has a negative velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a positive acceleration).
787847
Just use abs(x - y) . This'll return the net difference between the two as a positive value, regardless of which value is larger.
562383
Objects that are accelerating (speeding up) will have a positive slope on a speed vs. time graph, while objects that are decelerating (slowing down) will have a negative slope. You can also identify when an object has a larger or smaller acceleration using a speed vs.
1037400
Two negatives make a positive, so a negative number times a negative number makes a positive number. If you look at it on the number line, walking backwards while facing in the negative direction, you move in the positive direction. For example. -2 x -4 are both negative, so we know the answer is going to be positive.
900120
To find out something's speed (or velocity) after a certain amount of time, you just multiply the acceleration of gravity by the amount of time since it was let go of. So you get: velocity = -9.81 m/s^2 * time, or V = gt. The negative sign just means that the object is moving downwards.
701313
And it's not zero, it's -9.8m/s/s, as you acknowledge, so the direction of acceleration is meaningful. The no math answer to this one is to realize that acceleration is the rate of change of velocity. At the top most point, the velocity is indeed zero.
59164
Observe that the object below moves in the positive direction with a changing velocity. An object which moves in the positive direction has a positive velocity. If the object is speeding up, then its acceleration vector is directed in the same direction as its motion (in this case, a positive acceleration).
1234963
['If the base is negative and the exponent is an even number, the final product will always be a positive number.', 'If the base is negative and the exponent is an odd number, the final product will always be a negative number.']
207698
As to why the sign of centripetal acceleration is negative, this is because we denote it to be in the radial direction. The radial direction is the direction that starts at the center of a circle and goes directly outwards. Since the centripetal acceleration points inwards, we give it a negative sign.
818230
According to our general principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object also has a positive acceleration.
489763
Answer and Explanation: Having a non-zero acceleration means having any amount of acceleration whatsoever. This could be either positive acceleration or negative acceleration...
1003731
Positive acceleration is the object speeding up, however negative acceleration is the object slowing down.
1276571
The acceleration points in the same direction as the velocity if the car is speeding up, and in the opposite direction if the car is slowing down. I don't get it. Another way to say this is that if the acceleration has the same sign as the velocity, the object will be speeding up.
984605
As you go further to the right, the numbers increase. At 0, positive numbers go to the right, while negative numbers go to the left. Going away from 0 to the left, you get to -1 before you get to -2. So minus one is greater than minus two.