Observe that
the object below moves in the positive direction with a changing 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). …
Do you agree if the acceleration is positive the velocity is increasing?
In Example A, the object is moving in the positive direction (i.e., has a positive velocity) and is speeding up. When an object is
speeding up, the acceleration is in the same direction as the velocity
. Thus, this object has a positive acceleration.
What happens if you have a negative acceleration and a positive velocity?
For example,
the velocity could be in the positive direction and the object slowing down or the velocity could be in the negative direction and the object speeding up
. Both of these scenarios would result in a negative acceleration.
Can a body have positive velocity and negative acceleration?
Explanation:
Yes
, a body can have positive velocity and negative acceleration at the same time. For example when a lift goes upwards from 4th to 8th floor considering base as origin and get stopped , then velocity is positive while acceleration is negative.
What is positive negative acceleration?
A positive acceleration means an increase in velocity with time.
negative acceleration means the speed reduces with time
. … When the car slows down, the speed decreases. When an object is speeding up, the acceleration is in the same direction as the velocity.
Does a positive acceleration always mean an increase in speed?
If the speed is increasing, the car has positive acceleration
. When the car slows down, the speed decreases. The decreasing speed is called negative acceleration. In both cases, the car is accelerating, but one acceleration is positive and one is negative.
What are the two ways to get positive acceleration?
Acceleration is the name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate:
change your speed or change your direction—or change both
.
Is acceleration a change in speed or velocity?
Acceleration is defined as
the rate of change of velocity
. Velocity is a vector, which means it contains a magnitude (a numerical value) and a direction. So the velocity can be changed either by changing the speed or by changing the direction of motion (or both).
Can a body have positive velocity and positive acceleration?
Positive Velocity and Positive Acceleration
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).
What is an example of a negative acceleration?
Some examples of negative acceleration from our daily lives are: (1)
If we throw a ball with some initial velocity towards the sky, then the body goes up and attains a particular height and there it stops for a while and then comes back to the earth
.
Can a body have constant speed and variable velocity?
Yes
, a body has constant speed as well as variable velocity. Consider an example: A particle moving in a circular path with a uniform circular motion.
How do you know if acceleration is negative?
The acceleration is negative
when the object is moving in the positive direction
, but the rate of change of velocity is negative(velocity is decreasing). We can also define these two acceleration when an object travels in the negative or opposite direction(right to left).
How do you know if acceleration is positive or negative?
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 slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).
Can you have a positive acceleration and decreasing speed?
Yes
, an object can have positive acceleration and decreasing speed . while executing SHM , when an object moves from mean to extreme position, its velocity goes on decreasing while acceleration increases.
What is the acceleration at the highest point?
At a projectile’s highest point, its
acceleration is zero
.
