# A little question I want to ask

• Sundown444
In summary, changing the direction of velocity refers to a change in the direction of an object's motion, while changing the direction of acceleration refers to a change in the direction of an object's rate of change in velocity. In the case of throwing a ball upwards, the direction of velocity changes at the top of the trajectory, but the direction of acceleration remains downward due to gravity. Another example is when going from pushing the accelerator pedal to the brake pedal in a car, the direction of velocity stays the same but the direction of acceleration changes. In the case of centripetal acceleration at constant speed, both the direction of velocity and acceleration change.

#### Sundown444

Just to make sure, what is the difference between changing the direction of velocity and changing the direction of acceleration? Can anyone answer, please?

Sundown444 said:
Just to make sure, what is the difference between changing the direction of velocity and changing the direction of acceleration? Can anyone answer, please?
When you throw a ball upwards, then at the top of the trajectory the direction of velocity changes, but the direction of the acceleration stays the same.

A.T. said:
When you throw a ball upwards, then at the top of the trajectory the direction of velocity changes, but the direction of the acceleration stays the same.

So, the direction of acceleration due to gravity stays downward while the velocity's direction changes? If you don't mind me asking, can you please give me another example?

Sundown444 said:
can you please give me another example?
If you go from pushing the accelerator pedal to pushing the brake pedal, the direction of the car's velocity doesn't change, but the direction of the car's acceleration changes.

A.T. said:
If you go from pushing the accelerator pedal to pushing the brake pedal, the direction of the car's velocity doesn't change, but the direction of the car's acceleration changes.

Okay then. What about the case of a centripetal acceleration at constant speed? Do both the direction of the velocity and acceleration change?

Sundown444 said:
What about the case of a centripetal acceleration at constant speed? Do both the direction of the velocity and acceleration change?
Yes

Okay then. Thanks!

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