Velocity-time graphs

Homework and Review

Velocity-time graphs

Questions

• Which sections indicate forward motion?

• Which sections indicate constant acceleration?

• At what velocity does the vehicle travel at the 500 second mark?

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

Question 2

• Still assuming graphs are position –time

• Calculate the overall displacement for each graph

Question 3

• Assume it is a position- time graph

• What is the overall velocity?

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

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

Graph handout

• #10

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

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

Problem #1

Problem #2

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?

• For each section of the P-T graph, determine:

a.Direction of motion

b.Constant velocity or constant acceleration

c.If accelerating, is object getting faster or slower

For each section of the V-T graph, determine:

a. Direction of motion

b. Constant velocity or constant acceleration

c. If accelerating, is object getting faster or slower

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

Do Now

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

V (m/s)

-5

4

5 10 13 20 24

30

t (s)

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

For this graph, what are the overall:DisplacementDistance Velocity

Problem #5

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

-18 m/s

8s

11s

V-T graph

• Describe motion

V

t

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

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

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

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?

V-T graph

Identify motion for each part of the V-T graph

V (m/s)

T (m/s)