Skip to Content Go to sign in Skip to Primary Navigation Skip to Secondary Navigation Skip to Page Navigation Skip to Header Navigation Skip to Footer Navigation Read more about accessability options and our navigation

Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

Return to screen reader navigation

Mission KG7 Interpreting Velocity-Time Graphs 2

 The Question

The motion of six objects - A, B, C, D, E, and F - are represented by lines on a velocity-time graph. Write the letter(s) for any object which has a constant velocity (for the entire motion). List all that apply ... .
 

 Physics Rules

Velocity-Time Graphs:
Velocity versus time graphs represent changes that occur in an object's velocity with respect to time. The slope of the line is the acceleration (change in velocity divided by the change in time) of the object. The area under the line (between the line on the graph and the time axis) is the displacement of the object.

 Don't be Fooled

It is not unusual for a student to confuse position-time graphs with velocity-time graphs. They know that moving with a constant velocity is represented on a position-time graph by a straight diagonal line. So they instantly begin looking for the same line on this graph. But don't be fooled! This is a velocity-time graph and the slope is the acceleration. A diagonal line with a constant slope on a velocity-time graph is a line with a constant acceleration (meaning that there is a velocity change).

 Think About It

This is an example of a question that can be answered with a mixture of good math sense and logical thinking. The graph is a plot of velocity. Any motion that is characterized by a constant velocity would be represented by a line whose velocity coordinate is staying at the same level. Such a line is a horizontal line. A constant velocity motion is represented on a velocity-time graph by a horizontal line.

Return to Screen Reader Navigation