# Motion questions. Super easy 10 points!!?

Which of these situations describe the motion of object A, moving with a constant velocity where the net force is zero?

1. A car is moving along a straight road at a constant speed.

2. A car is moving along a straight road while slowing down.

3. A car is moving along a straight road while speeding up.

4. A hockey puck slides along a smooth (i.e., frictionless) icy surface.

5. A hockey puck slides along a rough concrete surface.

6. A c̫o̫ςκroach is speeding up from rest.

7. A rock is thrown horizontally; air resistance is negligible.

8. A rock is thrown horizontally; air resistance is substantial.

9. A rock is dropped vertically; air resistance is negligible.

10. A rock is dropped vertically; air resistance is substantial.

What if the object B is moving to the right, with the net force acting to the left, with means the acceleration is negative, so it's not a constant velocity?

Now what if the object C was falling because the net force is directed down?

Okay, so I know that object A would be both 1 and 4, and that's it. So what about object B and C?

Ha and for object b it's 2 and 5...so what about c?

Nevermind now lol. I know the answer to C is only 7...so....the first to post WHY for A will receive the best answer.