Acceleration and constant speed question

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Acceleration is not zero when a car is turning at constant speed because the direction of velocity is changing, making statement a) false. For statement b), the acceleration is zero while driving up a straight incline at constant speed, making it true. Statement c) is also true as the car's speed remains constant at the hill's crest, while d) is true since the car's speed does not change at the valley's lowest point. Statement e) is false because the car is accelerating as it speeds up while descending. Understanding the distinction between velocity and speed is crucial for accurately assessing these scenarios.
dbzsongoku
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Can someone tell me which of the these is true or false and possibly explain it to me?

a)The acceleration of a car is zero when it is turning right at a constant speed
b)The acceleration of a car is zero when it is driving up a long straight incline at constant speed
c)The acceleration of a car is zero when it is topping the crest of a hill at constant speed
d)The acceleration of a car is zero when it is bottoming out at the lowest point of a valley at constant speed
e) The acceleration of a car is zero when it is speeding up as it descends a long straight decline.

Any help would be great.

thanks
 
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What are your answers/hunches and the reasoning behind them...??

Daniel.

P.S.Read the "sticky" at the top of the thread...
 
These are fairly easy questions if you just Think. Consider acceleration as the rate of change in speed, in your case ou can even think of it as a change in speed. Think of forces dependent on inclinations.
 
Make sure you know exactly what acceleration is. In order for an object to accelerate, its velocity must be changing.
 
THE VELOCITY VECTOR MUST BE CHANGING WITH TIME AS TO HAVE A NONZERO ACCELERATION VECTOR...

Daniel.
 
Is this correct?
a) false because direction is changing
b) true
c) true
d) true
e) false because magnitude of the accerlation is changing
 
The way i see it,only B is true...

Daniel.
 
dbzsongoku said:
Is this correct?
a) false because direction is changing
b) true
c) true
d) true
e) false because magnitude of the accerlation is changing

why does your argment for a not apply to c and d?
 
DB said:
These are fairly easy questions if you just Think. Consider acceleration as the rate of change in speed, in your case ou can even think of it as a change in speed. Think of forces dependent on inclinations.

Unfortunately, thinking THAT way will lead you to the wrong answer to at least one of these. Think "velocity" not "speed"!
 

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