Velocity-time graphs

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Velocity-time graphs

• Homework and Review

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Velocity-time graphs
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Questions

• Which sections indicate forward motion?
• Which sections indicate constant acceleration?
• At what velocity does the vehicle travel at the
  500 second mark?

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Question 1

• Assume that each graph is a position-time graph
  (vertical units in meters, horizontal in seconds)
• Determine the velocity of the object at the 11.5
  second mark

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Question 2

• Still assuming graphs are position time
• Calculate the overall displacement for each graph

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Question 3

• Assume it is a position- time graph
• What is the overall velocity?

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Question 4

• Assume graph is a position-time graph
• Describe the motion in the 2nd section of each
  graph.
• Indicate direction, CV or ACC, faster, slower

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Question 5

• Assume graph A is a velocity-time graph.
• Describe the motion in each of the first 3
  sections of the graph.
• Indicate direction, ACC or CV, faster or slower

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Graph handout

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Homework Handout 2

• Name, Class Period,
• Add title Homework Handout 2
• For each section of the given graphs, indicate
• - direction (positive, negative, stopped)
• - type of motion (constant or non-constant vel)
• - if constant rate of motion (high, middle, low)
• - if NC, is object getting faster or slower

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For the following graphs

• Copy down to your paper
• Divide the motion up into sections
• Each section should only have one type of motion
• Indicate direction, velocity type, rate of
  motion or how the velocity changes

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Problem 1
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Problem 2
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Questions

• What do the vertical numbers represent?
• What does a horizontal line represent on this
  graph?
• What does a sloping line represent on this graph?

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• For each section of the P-T graph, determine
• Direction of motion
• Constant velocity or constant acceleration
• If accelerating, is object getting faster or
  slower

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• For each section of the V-T graph, determine
• Direction of motion
• Constant velocity or constant acceleration
• If accelerating, is object getting faster or
  slower

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• For each velocity-time graph, draw the equivalent
  position time graph

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Do Now

• Describe the motion that produced the following
  V-T graph

V (m/s)
4
30
t (s)
5
10
20
13
24
-5
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Assignment based on walking in front of motion
detector

• Some need to get the graph
• Once graph is in your possession
• Divide up into section, with only one type of
  motion for each section, describe motion
• Identify one section with constant velocity,
  calculate by using slope off P-T graph
• Identify one section with constant acceleration,
  calculate by using the slope off V-T graph
• Find the overall velocity

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For this graph, what are the overall Displaceme
nt Distance Velocity
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Problem 5

• Describe the motion in the following V-T graph.
  Then find the overall velocity of the first 2
  sections

8s
11s
-18 m/s
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V-T graph

• Describe motion

V
t
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• Given the following Velocity-Time graph, indicate
  the type of motion in each section. Include
  information on direction, acceleration or
  constant velocity

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• Find the overall velocity for the first 2
  sections in the V-T graph

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Example Q. 3

• A) Draw a P-T graph that shows an object
  remaining at rest for 15 seconds
• B) Draw a V-T graph that shows an object speeding
  up backwards at a uniform acceleration for 15
  seconds

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What to do for each graph

• For each section with the same type of motion,
  you should be able to determine
• Is the object moving positive, negative, or
  stopped
• Is the motion constant or not?
• If constant, is the rate of motion fast, average
  or slow?
• If not constant, is the object getting faster or
  slower?

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V-T graph
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Identify motion for each part of the V-T graph
V (m/s)
T (m/s)