Relationship between Velocity and Acceleration

[Muhammad Danish]

When the driver applies brakes its velocity starts decreasing and direction of acceleration will be same to the direction of velocity.
Is this statement True of False?
Please explain the true concept of this scenario. As far as I understand is that Velocity will start decreasing. But I am confused regarding the ''Direction of Acceleration''.
Thanks.
(REGARDS)

 

[lekh2003]

Acceleration means which direction or axis is the car increasing in velocity.

Imagine a lift moving up and down. It is currently moving up with constant velocity. The lift now needs to stop so it begins to DECELERATE in the direction upwards and ACCELERATE downwards. Acceleration means an increasing velocity in one direction and deceleration means a decreasing velocity in the other direction. This applies even if the lift isn't moving in the direction of acceleration or deceleration.

Can you apply this to your car?

 

[Muhammad Danish]

Acceleration means which direction or axis is the car increasing in velocity.

Imagine a lift moving up and down. It is currently moving up with constant velocity. The lift now needs to stop so it begins to DECELERATE in the direction upwards and ACCELERATE downwards. Acceleration means an increasing velocity in one direction and deceleration means a decreasing velocity in the other direction. This applies even if the lift isn't moving in the direction of acceleration or deceleration.

Can you apply this to your car?

Oh so will it mean that the car must accelerate backwards??

 

[Chestermiller]

When the driver applies brakes its velocity starts decreasing and direction of acceleration will be same to the direction of velocity.
Is this statement True of False?
Please explain the true concept of this scenario. As far as I understand is that Velocity will start decreasing. But I am confused regarding the ''Direction of Acceleration''.
Thanks.
(REGARDS)

The statement is false. Velocity and acceleration are vector quantities, and acceleration represents the rate of change of the velocity vector. Do you know what a vector is? If so, do you know how to perform vector addition and subtraction?

 

[Muhammad Danish]

The statement is false. Velocity and acceleration are vector quantities, and acceleration represents the rate of change of the velocity vector. Do you know what a vector is? If so, do you know how to perform vector addition and subtraction?

Yes, addition of vectors can be done by taking a scale and drawing a parallelogram or a triangle. By using triangle/parallelogram law of vector addition, we can find the resultant. Vector is a quantity that is described by both direction and magnitude.

 

[Dale]

Oh so will it mean that the car must accelerate backwards??

Yes

 

[lekh2003]

Oh so will it mean that the car must accelerate backwards??

Yes, this is what happens. The direction of the velocity mustn't be in the direction of acceleration for it to be accelerating/decelerating.