Download Meters per second, south

1. Which of the following units would
most accurately describe velocity?
A) Hours, south
B) Meters per second, south
C) Meters per second
D) Meters, south
1. Which of the following units would
most accurately describe velocity?
A) Hours, south
B) Meters per second, south Velocity is speed
(meter/sec) with a direction!
C) Meters per second
D) Meters, south
2. The boulder would have the greatest
kinetic energy at which of the positions
on the waterfall?
A position 1
B position 2
C position 3
D position 4
1
4
2
B
3
2. The boulder would have the greatest
kinetic energy at which of the positions
on the waterfall?
A position 1 (greatest
potential energy due
to position
B position 2 (greatest
kinetic energy or
energy of motion )
C position 3 (no
kinetic energy)
D position 4 (no
kinetic energy)
1
2
4
2
3
3. A yo-yo can demonstrate both
potential and kinetic energy. When
does a yo-yo have it greatest potential
energy?
A In the hand before the yo-yo
is released
B At the bottom of the string
C When the yo-yo is falling
D When the yo-yo is climbing
the string
3. A yo-yo can demonstrate both
potential and kinetic energy. When
does a yo-yo have it greatest potential
energy?
A In the hand before the yo-yo
is released (potential energy is highest,
kinetic is lowest)
B At the bottom of the string
(lowest potential energy, highest
kinetic energy)
C When the yo-yo is falling (potential
energy is being converted into kinetic
energy)
D When the yo-yo is climbing
the string (kinetic energy being
converted into potential energy)
4. Which of the following is an example of a
wave?
a. erosion
b. an earthquake
c. a volcano
d. a glacier
“B” is correct
a.
Erosion is the movement of earth material. Waves
are moving energy.
b. An earthquake is energy moving through the
earth’s crust in the form of a seismic wave.
c. A volcano is the pushing up of the earth’s surface
by hot magma and/or gases.
d. A glacier is a moving mountain of ice and soil.
Waves are moving energy. Choices a, c, and d are moving
Matter that require energy, but the seismic wave in the
earthquake is energy.
5. Windmill farms are becoming a popular method of generating electricity
for some communities. What form of energy in wind is used to turn
the giant blades of the windmill?
A. Chemical
B. Mechanical
C. Electrical
D. Thermal
5. Windmill farms are becoming a popular method of generating electricity
for some communities. What form of energy in wind is used to turn
the giant blades of the windmill?
A. Chemical (stored in the bonds of molecules)
B. Mechanical (wind - movement of air molecules)
C. Electrical (flow of electrons)
D. Thermal (heat caused by the kinetic
energy of molecules)
6. In a nuclear reactor, the energy used to turn
water into steam is in what form?
A. Chemical
B. Nuclear
C. Electrical
D. Thermal
The correct answer is “D”, thermal energy. The
nucleus of the uranium atom contains nuclear
energy, but this is converted into thermal energy
when the nucleus is split. The thermal energy is
then used to heat the water to the boiling point.
7. Which of the following can be
used to transform chemical energy
into heat energy?
A. melting a candle
Answer: B
B. lighting a match
C. solar panels
D. light bulb
7. Which of the following can be
used to transform chemical energy
into heat energy?
A. melting a candle (heat to kinetic)
Answer: B
B. lighting a match (chemical to heat)
C. solar panels (light to heat)
D. light bulb (electricity to light)
8. When the human heart contracts, it
pumps blood to other parts of the
body. When the heart contracts, the
blood moves because the-A.
B.
C.
D.
Pressure to the heart increases
Temperature of the blood increases
Density of the blood increases
Size of the heart increases
Answer
The correct answer is A
This item about a beating heart demonstrates the
relationship between biological processes, force, and
motion. When the heart contracts, the increases
pressure forces the blood to other parts of the body.
Grade 8 TAKS Science Information Booklet, p. 37
9. As a lima bean seedling starts to
grow into the soil the root tip is able
to push through the soil because it
acts as a -A.
B.
C.
D.
Wheel
Pulley
Gear
Wedge
Answer
The answer is D
The item shows how a seedling root acts as a
simple machine (a wedge). Because of its wedge
shape, the root tip needs less force to push
through the soil.
Grade 8 TAKS Science Information Booklet, p. 37
10.Which force causes the water
to move downstream?
A.
B.
C.
D.
Gravitational
Chemical
Electrical
Solar
The correct answer is A
Gravitational force causes the water to move
downstream. There is more potential energy at
the top of the mountain than at the bottom. In
streams that are flowing very fast, there is a
dramatic change (decrease) in the height of the
mountain from point A to point B (i.e. there is a
bigger drop). The gravitational force is a noncontact force.
11. Which of the following describes the
motion of the runner?
A The runner is moving at a
constant rate
B The runner is moving
slower at the end
C The runner is speeding up
D The runner’s speed was a
constant 4 m/s
11. Which of the following describes the
motion of the runner?
A The runner is moving at a
constant rate (incorrect distance changes faster than
time; constant change is
represented by a straight line)
B The runner is moving slower at
the end (incorrect - runner is
getting faster)
C The runner is speeding up
(runner is accelerating,
velocity is changing because
speed is changing)
D The runner’s speed was a
constant 4 m/s (incorrect –
speed is changing)