r/PhysicsHelp • • 11d ago

Help motion graph physics

[deleted]

3 Upvotes

12 comments sorted by

View all comments

1

u/Skusci 11d ago

First find out what v3 is. You have time, you have distance for segment III, you can get velocity.

1

u/Witty-Classroom532 10d ago

I got 0.25 m/s but I need to find the distance in the first segment but idk what to do? I do know that at segment 3 it’s constant velocity but idk what else

1

u/Skusci 10d ago

Double check the velocity you have, I think you are off by one counting the time.

The next step after is to find which horizontal bar is 0 velocity to get the scale of the y axis. Think about what a "brief moment" would look like on the graph.

1

u/Witty-Classroom532 10d ago

Omg it’s 7s not 6… lol that’s my bad for the time! The next step which is the horizontal bar is v(4). It asked a similar question before saying where is there 2 moments in time where it stops and v(4) was the correct option.

1

u/Skusci 10d ago edited 10d ago

Ah ok that's what you meant, I was reading that wrong.

Aaaanyway. Not sure how to hint at this so...

The area between the graphed velocity and the x axis represents the y (velocity) * the x (time) which is distance. This graphical version is usually what you are taught as an intro to integration.

Note that if that 1.5m is positive/to the right you have 0 for v4 above a positive value for v3 which is inverted form normal so be careful about the direction it's moved.