Name: ______

Constant Motion Test Review

Multiple Choice

Identify the choice that best completes the statement or answers the question.

A1. The speed of a cheetah running 300 yards in 10 seconds is:

a. / 30 yards per second / c. / 30,000 miles per hour
b. / 3,000 yards per minute / d. / None of the above

C2.Which is the correct best fit line for the graph?

a. / A / c. / C
b. / B / d. / D

_C3.Which of the following graphs shows constant motion?

a. / / c. /
b. / / d. /

Use this graph in the problems below:

____4.At what time is the runner at position 42 m?

a. / 6 s / c. / 8 s
b. / 7 s / d. / 5 s

____5.In the graph above, when the time is 4 seconds, what is the distance of the runner from the starting point?

a. / 28 m / c. / 21 m
b. / 35 m / d. / 14 m

____6.In the graph above, calculate the speed of the runner by finding the slope of the graph.

a. / 5 m/s / c. / 10 m/s
b. / 7 m/s / d. / 15 m/s

____7.Describe the motion of the runner.

a. / The runner is speeding up / c. / The runner is slowing down
b. / The runner is moving at a constant speed. / d. / The runner is not moving.

____8.What are the units for speed according to the graph?

a. / m/s / c. / miles/hour
b. / cm/s / d. / there are none

____9.If you know the distance traveled and the amount of time it took, speed may be calculated by:

a. / dividing time by distance. / c. / multiplying time by distance.
b. / dividing distance by time. / d. / multiplying distance squared by time.

____10.The velocity (speed) of an object can be calculated from two quantities. Which two are they?

a. / distance travelled, height of object / c. / distance travelled, time of travel
b. / distance travelled, mass of the object / d. / distance travelled, weight of object

____11.What is a real life example of constant motion?

a. / A baseball player running at a speed of 4 m/s / c. / A soccer player slowing down as she approaches a defender.
b. / A football player speeding up from rest to 4 m/s. / d. / None of the above.

____12.The slope of the line of a graph is calculated by:

a. / dividing the run by the rise: slope = run / rise / c. / dividing the rise by the run: slope = rise / run
b. / mutliplying the run by the rise: slope = run x rise / d. / None of the above

Problem

13.

Time (seconds) / Distance of object from start (cm)
0 s / 10 cm
2 s / 30 cm
4 s / 50 cm
6 s / 70 cm
8 s / 90 cm

a) Plot the data above on the graph below

b) Draw a “line of best fit”.

c) Find the slope of the line of best fit. Show your work

.

14.Answer the following questions about the speed of an object.

a. Define speed in your own words

b. Write an equation for calculating speed from time and distance.

c. How do you determine the speed of an object from the line of best fit on a graph?

.

15.If Carlos runs at a steady pace and covers a distance of 200 meters in 25 seconds, what is his speed?

Looking for: / Solution:
Given:
Relationships/Equations:

16.The distance vs. time graph below represents the motion of football player. Using the graph, construct a motion map starting at time t = 0s. The motion map should show the position of the object with a dot every 1 secfor the first 4 seconds.

A)

B. Does the graph show constant speed?

C) How do you know?

D) What is the average speed?

.

17.A new quarterback has just joined a football team. The coach would like to determine the speed of the ball that he throws. Write the steps that the coach should follow to calculate the speed of the ball. The equipment that the coach should use includes meter sticks and a stop watch.

Name: ______

Constant Motion Test Review

Answer Section

MULTIPLE CHOICE

1.ANS:APTS:1

2.ANS:CPTS:1

3.ANS:CPTS:1

4.ANS:APTS:1

5.ANS:APTS:1

6.ANS:BPTS:1

7.ANS:BPTS:1

8.ANS:APTS:1

9.ANS:BPTS:1

10.ANS:CPTS:1

11.ANS:APTS:1

12.ANS:CPTS:1

PROBLEM

13.ANS:

Time (seconds) / Distance of object from start (cm)
0 s / 10 cm
2 s / 30 cm
4 s / 50 cm
6 s / 70 cm
8 s / 90 cm

a) Plot the data above on the graph below

b) Draw a “line of best fit”

c) Find the slope of the line of best fit. Show your work

Use any two points from the line of best fit to find the rise and the run.

Then calculate the slope as rise over run

Example:Slope = rise/run = 80 cm / 8 sec = 10 cm/s

PTS:1

14.ANS:

Answer the following questions about the speed of an object.

a. Define speed in your own words

rate of change in speed with respect to time

b. Write an equation for calculating speed from time and distance.

v =d/t

c. How do you determine the speed of an object from the line of best fit on a graph?

Speed = slope

Speed = rise/ run

PTS:1

15.ANS:

If Carlos runs at a steady pace and covers 200meters in 25 seconds, what is his speed?

Looking for:
speed / Solution:
V = (200m)/ (25s) = 8 m/s
Given:
200 m
25 s
Relationships/Equations:
v = d/t

PTS:1

16.ANS:

The distance vs. time graph below represents the motion of football player. Using the graph, construct a motion map starting at time t = 0s. The motion map should show the position of the object with a dot every 1 secfor the first 4 seconds.

B. Does the graph show constant speed?

yes

C) How do you know?

It is constant speed because the graph is a straight line.

D) What is the average speed?

Speed = rise/ run = 20cm / 4s = 5 cm/s

PTS:1

17.ANS:

The coach should measure the distance traveled by the football and measure the time it takes to travel that distance.

Then, the coach would calculate the speed using:

v=distance/time

PTS:1