Question

10. Use the acceleration vs. time graph on the right to indicate where the line would be on the graph (somewhere in box A. somewhere in box B. either box AB, or at m/s) in the following situations. An object at rest. Acceleration vs. Time A positive velocity. A An object slowing down in the positive direction. I Time (s) + + 2 An object moving forward, speeding A B A positive velocity Acceleration (m/s) No slope on a position vs. time graph. A negative slope on a velocity vs. time graph. Object slowing down with negative velocity. + Part III: Free Fall 1. Which object would fall faster in a vacuum, a feather or a bowling ball? Why? 2. The acceleration due to gravity, here on Earth is always 3. When objects ar en objects are dropped which of the following are true that means the

could u explain why 10b is AB and could you explain to me why we cant tell why acceleration has direction

Answer 1

In 10b, all that has been said is that velocity is positive. Now there can be three situations for positive velocity.

I) velocity is increasing, which means acceleration is positive.

II) velocity is constant, which means acceleration is zero.

III) velocity is decreasing, which means acceleration is negative.

Since acceleration can be negative, zero or positive for this case, so acceleration graph can be in both the boxes A and B.

Acceleration is result of Force. It always points in the direction of resultant force. If resultant force is zero acceleration is zero.