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When Jennifer is out for a ride she slowns down on her bike as she approaches a group of hikers on a trail explain how her acceleration can be positive even though her speed is decreasing?
Wiki User
∙ 14y ago
Hum, it cannot.
As acceleration is the first derivative of the speed, if the speed is constant the derivative is null, if the speed is decreasing the derivative is negative. When talking about all this stuff we take into account the instantaneous values (instant speed, instant acceleration).
Note that when you slow down, you slow down overall but can locally in time accelerate a little bit, let's say during 1/10th of a sec because you reached a partion of the road which was sloping. However this does not change the fact that when the speed decrease, the acceleration is negative.
Wiki User
∙ 14y ago
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Is it possible for a mass to be speeding up while its acceleration is decreasing in magnitude?
Sure. If there is any positive acceleration (in the direction of motion) then the speed is increasing. It doesn't matter whether the acceleration is increasing, decreasing, or staying constant. As long as acceleration (in the direction of motion) remains positive, the thing keeps speeding up.
What is meant by positive acceleration and negative acceleration?
Positive acceleration = speeding up; speed increasing in the direction you're moving.Negative acceleration = slowing down; speed decreasing in the direction you're moving,or speed increasing in the opposite direction.
Does an object that is moving in a linear path with an acceleration in the direction opposite to the motion have a decreasing velocity?
No. Acceleration is Delta-Velocity / Delta-Time. If Acceleration is negative then that means that either Delta Velocity is negative or Delta Time is negative---which is not practical. For Acceleartion to be negative, that means the Velocity has to Decrease. (where Delta Velocity is change in Velocity or V2 - V1)
What has to happen to a car's acceleration and velocity for a car's speed to increase and have a positive acceleration?
The velocity has to increase in a positive direction. The increase in velocity in a positive direction is a positive acceleration.
What is positive and negative acceleration?
Positive acceleration = speeding up. Negative acceleration = slowing down.
Is it possible for a mass to be speeding up while its acceleration is decreasing in magnitude?
Sure. If there is any positive acceleration (in the direction of motion) then the speed is increasing. It doesn't matter whether the acceleration is increasing, decreasing, or staying constant. As long as acceleration (in the direction of motion) remains positive, the thing keeps speeding up.
What is meant by positive acceleration and negative acceleration?
Positive acceleration = speeding up; speed increasing in the direction you're moving.Negative acceleration = slowing down; speed decreasing in the direction you're moving,or speed increasing in the opposite direction.
What is called negative accelarration?
Deceleration. Negative acceleration = Velocity is decreasing by time. Positive acceleration = Velocity is increasing by time. Zero acceleration = Velocity is the same by time.
Can an object's rate of acceleration decrease and its speed increase at the same time?
Yes, assuming the object's rate of acceleration remains positive during the time it is decreasing.
Does an object that is moving in a linear path with an acceleration in the direction opposite to the motion have a decreasing velocity?
No. Acceleration is Delta-Velocity / Delta-Time. If Acceleration is negative then that means that either Delta Velocity is negative or Delta Time is negative---which is not practical. For Acceleartion to be negative, that means the Velocity has to Decrease. (where Delta Velocity is change in Velocity or V2 - V1)
Can there be a positive acceleration and a negative acceleration?
Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.
What has to happen to a car's acceleration and velocity for a car's speed to increase and have a positive acceleration?
The velocity has to increase in a positive direction. The increase in velocity in a positive direction is a positive acceleration.
Explain the difference between positive and negative acceleration?
well the difference between positive and negative velocity would have to be that if your motion speeds up than you have a positive and when or if your motion slows down then you would have a negative accelerarion!!!!
What is positive and negative acceleration?
Positive acceleration = speeding up. Negative acceleration = slowing down.
Is increasing acceleration the same as positive acceleration?
No. "Positive acceleration" means increasing speed. The acceleration is usually constantin typical Physics examples and applications.
What is positive acceleration negative acceleration?
Positive is speeding up and negative is slowing down
What can positive acceleration called?
Positive acceleration could be called "speeding up" if you felt like it.
