Conceptual Problems

  • Thread starter Jngo22
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  • #1
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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.
 

Answers and Replies

  • #2
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does anyone know the answer to any of these?

I have 2 hours to decide whether to drop my class or not
 
  • #3
berkeman
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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.

Welcome to the PF. Mostly right answers, and good intuition. #2(c) could use some fixing, though.
 
  • #4
berkeman
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10,893
does anyone know the answer to any of these?

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

Don't drop it. You're doing fine.
 
  • #5
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thanks for the help, I really appreciate it

I dropped the class already though XD
 
  • #6
berkeman
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60,575
10,893
thanks for the help, I really appreciate it

I dropped the class already though XD

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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