Ideal particles in (irrotational) stable fluid vortices. Positive acceleration results in the object speeding up, such as a car going from 0mph to 30mph. For instance, an object with a velocity changing from +3 m/s to + 9 m/s is speeding up. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up. Yes, an object can have both a negative acceleration and a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration). 1) Slowing down This "negative" acceleration is actually called deceleration. How can an object have a negative acceleration while speeding up and a positive acceleration while slowing down?
When an object is speeding up, the acceleration is in the same direction as the velocity. You have the gas pedal floored, and you are accelerating 10 miles per hour every second. Example: Let's call 'up' the positive direction. Question: Can An Object Have A Negative Acceleration And Be Speeding Up? An object can have a negative acceleration when it is deselerating. Remember that in this graph, the slope is acceleration, so the acceleration is negative. 0 0. read more. Speeding up means that the magnitude (the value) of the velocity is increasing. One of them is from slowing down, and one of them is based on frames of references. Therefore, you can't be speeding up because speed and acceleration are connected. A velocity is a speed in one direction, as oppossed to a speed which is just a speed in any direction, and which can change direction at will. Why not a decrease? Acceleration is a vector, and depending on it's direction relative to the velocity, the object may speed up, slow down, or have no change in speed. First second, you’re going 10 miles per hour. Acceleration is a vector...meaning that it has a magnitude (a "number"/size value assigned to it) as well as a direction (typically indicated by a + or - sign). Source: physicsforums.com. Acceleration has a magnitude.
false A car can have a negative acceleration and be speeding up. The magnitude of an acceleration can change causing an object to increase its velocity faster or slower, but still it is an increase.
(a) Yes, an object can have zero velocity and still be accelerating simultaneously. Satelites on ideal circular stable planetary orbits.
Negative acceleration is the object decelerating, such as using the brake in a car. The choice of coordinate systems is arbitrary.
Say you take a ball, throw it straight up in the air, and then catch it again.
In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up. If So, Describe A Possible Physical Situation And A Corresponding Coordinate System. you have to define "negative acceleration".
Acceleration is a vector quantity -- it has magnitude and direction. When an object is speeding up, the acceleration is in the same direction as the velocity. Please explain using easy terms, I do not understand the way my textbook explains it. It is more than a mere mathematical symbol. Yes. If Not, Explain Why Not. Negative acceleration is what some people call acceleration (slowing down). In this acceleration graph, velocity is going down. Speeding up means that the magnitude (the value) of the velocity is increasing. An example of the latter is an object moving in a circular path at constant speed.
Lets say you are in your car, and you are driving down the street. Observe that the object below moves in the negative direction with a changing velocity. For instance, an object with a velocity changing from +3 m/s to + 9 m/s is speeding up. No. Negative acceleration means that you are decreasing in acceleration, like braking a car.
If you throw the ball upward with a speed of 9.8 m/s, the velocity has a magnitude of 9.8 m/s in the upward direction. Here’s a simple example that shows how a simple constant acceleration can cause the speed to increase and decrease in the course of an object’s motion. Thus, this object also has a negative acceleration.
An object which moves in the negative direction has a negative velocity. If the velocity starts negative, however, then negative acceleration is speeding up. In physics, the use of positive and negative always has a physical meaning. An object can have a negative acceleration but it can not have a negative velosity. Observe the use of positive and negative as used in the discussion above (Examples A - D).
For negative velocity, imagine a number line. There is acceleration pointing radially outward, but speed is not changing. Thus, this object also has a negative acceleration. For example when an object moves from 30m/s of velosity to 10m/s it will have a negative acceleration.
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