Name: ___________________
Period: _____
Date: ________
Unit 2.1 Test Review
Calculating Speed
Speed is the rate at which an object __MOVES/TRAVELS____. The formula for calculating speed is
Speed =
or abbreviated is
S=
For example, a bluebird traveled 200 kilometers in 5 minutes. What speed did the bluebird travel?
Set Up:
=
= __40__ km/min
Why is it important to always express speed with correct units? IT IS IMPORTANT TO USE THE CORRECT UNITS
SO THAT PEOPLE UNDERSTAND WHAT YOU ARE EXPLAINING AND HOW YOU MEASURED
____________________________
Velocity is speed and __DIRECTION____ of a moving object. For example, a cheetah travels at a velocity
of 33 meters/second east.
Practice Speed Problems:
A pelican travels 500 kilometers (km) in 5 minutes (min). What is the speed?
Set Up:
Speed =
=
Answer: 100___ km/min
A squirrel runs 60 meters (m) in 20 seconds (sec). What is the speed?
Set Up:
Speed =
=
Answer: __3_ m/sec
Average Speed
Average speed is calculated by dividing the __TOTAL___DISTANCE___ by the TOTAL TIME traveled. The
formula for determining average speed is
Average Speed =
For example, a turtle travels 60 centimeters in 29 seconds and then he stops to eat some grass. Then he
continues and travels an additional 10 centimeters in 6 seconds.
Set Up:
=
= 2 cm/sec
Name: ___________________
Period: _____
Date: ________
Practice Average Speed Problems:
Gail drove her car on a trip to see her sister. On the first part of her trip, Gail traveled 520 kilometers (km) in
9.5 hours (hr). On the next day, Gail traveled 280 kilometers (km) in 6.5 hours (hr). Calculate Gail’s average
speed while she drove to her sister’s home.
Set Up:
Average Speed =
=
=
Answer: _50___ km/hr
A mail carrier traveled 1600 meters (m) 45 minutes (min). Then the mail carrier took a break. Afterward, the
mail carrier traveled another 1600 meters (m) in 40 minutes (min). She then took her lunch break. After
lunch, the mail carrier traveled another 3200 meters (m) in 75 (min). What was the mail carrier’s average
speed?
Set Up:
Average Speed =
=
=
Answer: __40_ m/min
Measure and graph changes in motion
Label this graph as a distance time graph. Label the y-axis and the x-axis, don’t forget units!
DISTANCE
(M)
TIME (SEC)
What type of graph do you make when you plot distance and time? ____DISTANCE-TIME GRAPH__
Name: ___________________
Period: _____
Date: ________
This graph below shows how far a student biked to get to her friend’s house.
How far (total distance) did the student go? _________6 METERS________________________
At point C, what was the student doing? ______TAKING A BREAK, RESTING, STOPPED_________________
What information do you need to determine an object’s speed?____THE DISTANCE AND THE TIME____
What is the formula for speed? ___SPEED = DISTANCE DIVIDED BY TIME____________
What is the speed at point B? ________1 METER PER SECOND____________________________
What is the formula for average speed? ____TOTAL DISTANCE DIVIDED BY TOTAL TIME_____________
What is the average speed of the student? _____.6 METERS PER SECOND_____
Use the table below to answer the question. This table represents the movement of a cat over time.
Seconds
2
4
6
8
10
12
Distance
Traveled (m)
10
20
30
40
50
60
What is the formula for average speed?
Average Speed =
What was the cat’s average speed? ___5 METERS PER SECOND___
Show your work:
Name: ___________________
Period: _____
Date: ________
What does the graph below represent? ___AN OBJECT AT REST (STOPPED)_____
What does the graph below represent? _____AN OBJECT MOVING AT A CONSTANT SPEED_
What is happening in the graph below? ____AN OBJECT MOVING FASTER AND FASTER_(acceleration)____
A distance-time graph tells us how far an object has moved with time. The steeper the graph, the _____
______FASTER IT IS MOVING ________
Name: ___________________
Period: _____ Date: ________
A graph with a line leveling off means ____THE OBJECT IS SLOWING DOWN_(deceleration)_____.
A downward sloping line means ______RETURNING TO THE START ____________.
Highlight where the graph is showing constant speed.
Circle the area where the object is at rest.
Put a square around the area when the object is coming back to the start .
Name: ___________________
Period: _____
Date: ________
Use the graph below to describe the motion of each car:
Car A _____TRAVELLING AT A CONSTANT SPEED__________
Car B _____MOVING FASTER AND FASTER_____________________________
Car C ____SLOWING DOWN__________________________________
Car D _____STOPPED_____________________________________
Look at the three graphs below:
Distance
Time
Time
Time
Time
Which graph shows the motion of a person who raced down a flight of stairs and then turned right around
and began to race back up the flight of stairs but at a slower rate? ____ GRAPH C____
Name: ___________________
Period: _____ Date: ________
Which graph shows a car that traveled at 30 mph on a road and then came to a red light?
_______________GRAPH A______________________________________________________
Balanced and Unbalanced Forces
Which diagram shows balanced forces acting on the box? Left or Right (circle one)
Which diagram shows unbalanced forces acting on the box? Left or Right (circle one)
What is the net force acting on Box A? _O N__ Right or Left (circle the correct direction) NOT MOVING!
What is the net force acting on Box B? __5 N__ Right or Left (circle the correct direction)
What is the net force acting on Box C? __1 N___ Right or Left (circle the correct direction)
 Do not forget the units!
A
B
C