# Conceptual Problems

1. Feb 27, 2009

### Jngo22

1. Can an object increase its speed if the magnitude of the acceleration is decreasing?

I put yes because an object be accelerating at 50 m/s^2 and then decelerate to 40 m/s^2 but velocity would still increase.

2. Describe the motion of the object
V parallel to a
V anti-parallel to a
V perpendicular

I put that when V is parallel with a, it accelerates
When V is anti-parallel with a, it decelerates
When it's perpendicular, its at rest

3. Standing in a train, you throw a coin to the side, describe the motion of the coin.

I put that the coin will travel with the train and drop under where the person dropped the coin at.

4. When traveling down a flat road at a constant speed, do you feel lighter, heavier, or the same.
Going up a hill?
Going down a hill?

I put the same for the flat road, lighter going up a hill, and heavier going down.

Can anyone please check my work? I want to know how I did on an exam. Thank you.

2. Feb 28, 2009

### Jngo22

does anyone know the answer to any of these?

I have 2 hours to decide whether to drop my class or not

3. Feb 28, 2009

### Staff: Mentor

Welcome to the PF. Mostly right answers, and good intuition. #2(c) could use some fixing, though.

4. Feb 28, 2009

### Staff: Mentor

Don't drop it. You're doing fine.

5. Feb 28, 2009

### Jngo22

thanks for the help, I really appreciate it

I dropped the class already though XD

6. Feb 28, 2009

### Staff: Mentor

That's too bad, you sounded like you had a handle on the course material. Oh well, hopefully you take the course next term.

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