Acceleration When the velocity of a moving object changes, we say that the objec

Question

Acceleration When the velocity of a moving object changes, we say that the object is accelerating. We can change the velocity by changing either the magnitude of the motion (the speed) or the direction of the motion. The rate of change of velocity is called acceleration. Thus we define acceleration as Acceleration = change of velocity / change in time Acceleration = ( final velocity - initial velocity ) / change in time = (Vf - Vi)/ (tf - ti) Since velocity is a vector, acceleration is also a vector. Accleration has both magnitude and direction. In your car, if you step on the brake lightly, you will have a small (negative) accleration. If you push hard on the brake, you have a higher (negative) acceleration. What is the aceleration of a car that maintains a constant velocity of 30 m/s for 10 seconds? Question 30 options: zero 30 m/s-s or 30 m/s/s 300 m/s-s or 300 m/s/s greater than 300 m/s-s

Explanation / Answer

constant velocity There's the clue. The acceleration is zero, because: Accelerations cause changes in the speed and/or the direction of the object in question. Since velocity is constant, the speed and direction are constant (i.e. NOT changing). So, there must be no acceleration of the object to account for this.

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