K.I.S.D. District Common Assessment
th
Science 7 Grade week 21
2010
2. The drawing above shows a
diagram of the Steel Dragon 2000,
a roller coaster in Japan. It is one
of the longest roller coasters in the
world. At which point on the roller
coaster would a rider have the
greatest gravitational potential
energy?7.8A
A.
W
B.
X
C.
Y
D.
Z
1. In the picture above, a boy is
trying to pull a dog on a leash, but
the boy is moving in the same
direction. Which of the following
best describes the forces in this
situation?7.6A
A.
The forces are balanced,
and the net force is zero.
B.
The forces are
unbalanced, and the boy’s
force is greater.
C.
The forces are
unbalanced, and the dog’s
force is greater.
D.
The forces are balanced,
and the dog is stronger
than the boy.
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6. Force is measured in- 7.6A
A. Joules
B. Watts
C. Newtons
D. Meters
7. Which of the following
statements about machines is NOT
true? 7.6A
A. Machines make work easier.
B. Machines must get force
from outside sources.
C. Machines require an input of
electrical energy.
D. Machines can be either
simple compound.
3. The picture above shows a
pulley being used to move a load.
In which direction will the load
move if the force applied to the
rope is greater than the force of
gravity on the load?7.6A
A.
Right
B.
Left
C.
Up
D.
Down
8. A ball sitting at the top of the
hill is an example of – 7.8A
A. Potential energy
B. Kinetic energy
C. Work energy
D. Force
4. Which of the following best
represents stored potential
energy?7.8A
A.
Air leaking from a flat tire
B.
Stress built up in a rock
fault
C.
Heat given off by a forest
fire
D.
Water flowing through a
hose
5. How much force is needed to
accelerate a 1,300 kg car at a rate
of 1.5 m/s2 ? 7.6A
A.
867 N
B.
1,950 N
C.
8,493 N
D.
16,562 N
2
10. When you bend your arm at
the elbow, the bones and muscles
in your arm are acting as a system.
Which simple machine does this
system best represent? 7.6A
A. Inclined plane
B. Lever
C. Pulley
D. Wedge
Read the experimental procedure
below to answer
the following question.
Step 1: Create a ramp that is 15
cm high and 30 cm long
Step 2: Determine the mass of
a small rubber ball, a marble,
and a ping pong ball.
Step 3: Record the time it takes
for each ball to roll down the
ramp.
Step 4: Repeat 2 times for each
ball.
9. Which of the following
hypotheses is the procedure
designed to test? 7.2A
A. Balls roll down ramps faster
than balls roll across a flat
surface.
B. The higher the ramp, the
less time it takes a ball to
roll down a ramp.
C. Ramps are inclined
planes that affect the
motion of balls.
D. Objects with a higher
mass roll faster down
ramps than objects
with a lower mass.
11. A student throws a ball to a
friend. Which of the following
forces cause the ball to fall
downward? 7.6B
A. Catching the ball
B. Friction of the air on
the ball
C. Gravitational pull of
Earth
D. Throwing the ball
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The diagram below shows a
student using a spring scale to pull
a wooden block up a ramp that is
resting on a stack of books.
12. Compare the two situations shown
above. In Situation 2, the box is
pushed up the ramp instead of lifted
straight up, as in Situation 1. How does
using this simple machine, called an
inclined plane, make the work easier?
7.6A
A. Decreases amount of time
needed to lift the box
B. Decreases amount of force
needed to lift the box
C. Decreases the amount of motion
needed to lift the box
D. Decreases the distance over
which the force is applied
13. Which change would require
more force to pull the wooden
block up the ramp?7.6A
A. Have the student use two
hands.
B. Reduce the mass of the
wooden block.
C. Restack the books so the
thinnest book is on the
bottom.
D. Glue sandpaper to the
surface of the ramp.
4
14. Paul’s family is moving across
town, so his father rented a
moving truck for the day. A ramp
pulls out of the truck bed. The bed
of the truck is 1 m high, and the
ramp is 3 m long. Paul makes two
statements amount the truck
ramp: 7.6A
16. A fan cart is moving on a
frictionless surface. If you change
the fan speed from high to low,
what will occur? 7.6B
A. The cart will stop
going.
B. The cart will slow
down.
C. The cart will keep
moving at the same
speed.
D. The cart will continue
to speed up, but not as
quickly as before.
Statement 1: The ramp is an
inclined plane, and we will have
to move the boxes a longer
distance to get them into the
truck than if we lifted them
straight up.
Statement 2: Using the inclined
plane will require less effort.
A. Statement 1 is true and
statement 2 is false.
B. Statement 1 and 2 are both
true.
C. Statement 1 is false and
statement 2 is true.
D. Statement 1 and 2 are both
false.
17. The strong man lifts the sheep
by pulling down at position A. How
will the distance that he pulls down
compare to the distance that the
sheep moves up? 7.6A
A. The distance that the
sheep moves up will be
more than the distance
the strong man pulls
down.
B. The distance that the
sheep moves up will be
the same as the distance
that the strong man pulls
down.
C. The distance that the
sheep moves up will be
less than the distance that
the strong man pulls
down.
D. It is impossible to tell
from this picture.
15. A wheel and axle is a lever
that rotates about a fixed point.
All of the following machines
employ a wheel and axle except?
7.6A
A. bicycle
B. skateboard
C. pencil sharpener
D. crowbar
5
19. The Earth makes a complete
rotation once every 24 hours.
Which of the models below would
best illustrate rotation? 7.3C
18. A truck carrying a box is
traveling 60 kilometers per hour.
Suddenly, the truck brakes to a
stop. Which choice best explains
what will happen to the box?7.6B
A
A. The box will keep moving
forward because objects
in motion tend to stay in
motion.
B. The box will slide off the
back because for every
action there is an equal
and opposite reaction.
C. The box will not move
because objects at rest
tend to stay at rest.
D. The box will gain speed
because, for objects of a
given mass, greater
force results in a greater
acceleration.
C
B
D
20. The girl in the picture above is
using a lever to lift a heavy box.
Using the lever makes the girl’s
task easier by- 7.6A
A.
reducing the input force
B.
reducing the box’s mass
C.
increasing the amount of
work done
D.
increasing the distance
the box is lifted
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23. A rubber ball was dropped from
the same height onto five different
surfaces. The height of the first
bounce was measured and
recorded. The graph above shows
the data. Based on the data, which
of the following is the best
conclusion?
A.
Rubber balls bounce higher
on harder surfaces
B.
All balls bounce higher
indoors than they do
outdoors.
C. Tennis balls bounce higher
than basketballs on all
surfaces.
D.
Large balls do not bounce
as high as small balls.
21. When a toy car is wound up
and released on a tile floor, it
accelerates as shown in the
diagram above. What is the force
in Newtons that the car’s wheels
exert on the floor when it is
released? 7.6A
A.
0.05 N
B.
0.5 N
C.
5N
D.
50 N
24. A car suddenly stops at a red
light, a book lying on the car seat
slides forward. Why does the book
continue to move forward?7.6B
A.
The book loses its
backward momentum.
B.
The car moves in reverse
more rapidly than the
book.
C.
The friction of braking
transfers energy to the
book.
D.
The book’s inertia causes
it to continue moving.
22. At which point along the
baseball’s flight path is its potential
energy greatest?7.8A
A.
1
B.
2
C.
3
D.
4
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27. The diagram below shows two
dogs pulling on a rope with
constant but unequal forces.7.6A
25. In the diagrams below, two
forces are exerted on an object.
The forces are represented by
arrows. The length of the arrow
indicates the amount of force. In
which of the diagrams will the
object remain at rest?7.6A A
Which compass direction will both
dogs most likely move?
A.
east
B.
west
C.
north
D.
south
26. The illustration below shows a
student approaching the door to a
building.
28. The diagram below shows a
hammer being used by a person
to remove a nail from a piece of
wood.
The hammer is being used as
which type of simple
machine?7.6A
A. wheel and axle
B. inclined plane
C. lever
D. pulley
Which two simple machines are
being used to enable the student to
reach the door?7.6A
A.
inclined plane and pulley
B.
lever and wheel-and-axle
C.
pulley and lever
D.
wheel-and-axle and
inclined plane
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