## kaylababyy94 Which example identifies a change in motion that produces acceleration? (1 point) a speed skater moving at a constant speed on a straight track a ball moving at a constant speed around a circular track a particle moving in a vacuum at constant velocity a vehicle moving down the street at a steady speed one year ago one year ago

1. Shane_B

$a=\frac{dV}{dT}$which basically means it's equal to rate of change in velocity. Only one of the above actually has a change in velocity. Can you figure out which one?

2. kaylababyy94

I'm guessing either the Speed Skater or the Ball..

3. Shane_B

The ball. You have to remember that velocity is a vector and therefore has both a speed and a direction. In the case, the ball is moving around a circular track...so it's direction is always changing. If the direction is changing so is its velocity...so it must have an acceleration.

4. kaylababyy94

Oh I get it. The other things change direction. The car is iffy but it could urn down another street. Could you help me with a few more?

5. Shane_B

ok