Transcript Study Guide Answers

Assessment Study
Guide Answers
Mr. Schmidt
Portola Middle School
8th Grade Physical Science
4/11/2017
1. The velocity of a
car is determined
by its speed and its
direction.
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2. In which of these units can
density be expressed?
a. milliliters per gram
b. grams per liter
c. milliliters per meter
d. cubic centimeters per
gram
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3. After a bus left a bus
station, it began to move at
a faster rate. What
happened to the velocity of
the bus?
The velocity changed
because the bus’ speed
changed.
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4. During her winter vacation, Karen
hiked for 60 km, rode a boat for 100
km, and drove in a car for 320 km. Each
activity took her 2 hours to complete.
What is Karen’s average speed?
Distance = 60km + 100km + 320 km
Distance = 480 km
Time = 3 activities X 2 hours each
Time = 6 hours
Speed = Distance ÷Time
Speed = 480 km ÷ 6 hrs = 80 km/hr
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5. What is the direction
and size of the buoyant
force acting on an ice
cube floating in water?
Upward and Equal to the
weight of the water
displaced by the ice
cube
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6. During a race, Oscar reached a
higher top speed than Anesto,
but Anesto won the race. What
must have happened for Anesto
to win?
Anesto raced at a higher
average speed than
Oscar
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7. What is the formula for
Density?
Density = Mass ÷ Volume
D = m/V
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8. Katherine threw marbles at a target.
The marbles were the same volume,
but one marble had a greater mass
than the other. If thrown in the same
way with equal force, which one had
the greatest acceleration? Which one
had the least acceleration?
The lighter marble had
greater acceleration
The greater marble had
least acceleration
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9. Mr. Schmidt gave his students directions:
Walk at a 90 degree angle from the front door
of Room 111 until you exit the B Building. 15
meters from the door you will find an envelope
with the next directions
What additional information do Mr.
Schmidt’s students need to find the
envelope?
The direction to walk from
the door.
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10. Jasmine is riding a bicycle.
When Jasmine applies force to the
pedals, she begins to move
forward. What combination of
forces acts in the opposite
direction of the bicycle’s forward
motion?
FRICTION and AIR
RESISTANCE
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11. Traveling down a straight road,
a car changed velocity while its
speed remained constant. What
caused this to happen?
The car changed
direction
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12. Andrew released a block of iron
and a block of ice at the same time
from the top of a slide. Which
block would reach the bottom
first, and why?
ICE BLOCK
There was more friction
on the iron block than
on the ice block
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13. A lady bug crawls 10 meters
up a tree in 5 hours. What is
the lady bug’s average speed?
Speed = Distance ÷ Time
Distance = 10 meters
Time = 5 hours
Speed = 10 meters ÷ 5 hours
Speed =
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2 m/hr
14. In which example can
velocity be determined?
a. Brian walks 10 km per hour.
b. Erick drives for 200 km.
c. Adrian travels Northeast at 50
km per hour.
d. Joceline travels Southwest for
100 km.
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15. An object will float
in water if it has
density less than 1.0
grams per milliliter.
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16. What information do you
need to know to predict
whether an object will
float in a liquid?
The density of the
object and the liquid.
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17. Label the forces acting on the
apple to make it stationary.
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18. The table below shows the results of
an experiment that had identical ramps
and identical marbles. Each student
rolled a marble down the ramp and
measured the distance. What might have
affected the results?
Student
Distance Marble Traveled
Aidee
9.6 meters
Rolando
12.5 meters
Alphonso
9.4 meters
Joyce
9.3 meters
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Rolando
pushed the
marble
instead of
letting it go
19. Scientists want to find the density
of a 30 gram rock. After the rock was
dropped into a 20 ml graduated
cylinder the volume increased by 6
ml. What is the density of the rock?
Density = Mass ÷Volume
Mass = 30 grams
Volume = 6 ml
Density = 30 g ÷ 6 ml
Density = 5 g/ml
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20. Jeanette placed a glass of orange juice
on a ramp. The glass of orange juice did
not move. Why did the orange juice stay
at the top of the ramp?
CORRECTION:
The Force of Friction
EQUALS the force pulling
the glass of orange juice
down the ramp
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21. A lady bug traveled 12
meters in 30 seconds. How far
would the lady bug travel in 60
seconds?
12 meters in 30 seconds =
24 meters in 60 seconds
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22. Mr. Schmnidt’s coffee mug is
resting stationary on his table.
Why is the mug stationary?
The table is exerting an
upward force that
opposes gravity.
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23. An ant crawled up a tree. The graph
below shows how the ant’s height on
the tree changed with time. Based on
the slope of the line, how far will the
insect have traveled in 60 seconds?
Distance vs. Time
14
Distance (in meters)
24
Meters
12
10
8
6
4
2
0
0
5
10
15
20
Time (in seconds)
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25
30
24. During what interval did the car move at a constant
speed? How do you know?
Between 0-30 seconds. The slope was the same
Distance vs. Time
Distance (in meters)
140
120
100
80
60
40
20
0
0
5
10
15
20
25
30
Time (in seconds)
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35
40
45
25. At what time did the car reach the
greatest speed?
At 35 Seconds.
Distance vs. Time
Distance (in meters)
140
120
100
80
60
40
20
0
0
5
10
15
20
25
30
Time (in seconds)
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35
40
45
26. Explain how to determine when the car reached the
greatest speed?
When the slope was the greatest.
Distance vs. Time
Distance (in meters)
140
120
100
80
60
40
20
0
0
5
10
15
20
25
30
Time (in seconds)
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35
40
45
27. What was the average speed of the car as it moved along
the 120 meter road?
Speed = 120 m ÷ 45 seconds = 2.67 m/sec
Distance vs. Time
Distance (in meters)
140
120
100
80
60
40
20
0
0
5
10
15
20
25
30
Time (in seconds)
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35
40
45
Distance (in km)
28. Jeff went running. The farther Jeff
traveled from his starting point, the
slower he jogged. Draw a distance vs. time
graph that best shows Jeff’s speed while
running.
Time (in seconds)
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HOMEWORK:
GO OVER THE TEST AT
LEAST 10 TIMES
KNOW THE QUESTIONS
AND THE ANSWERS.
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