8th Grade, Unit 4: Energy Question Preview (ID: 48711)


8th Grade, Science A, PCA, Mrs. McKinley. TEACHERS: click here for quick copy question ID numbers.

Two identical masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other?
a) The faster object has four times as much kinetic energy as the slower object.
b) The faster object has the same kinetic energy as the slower object.
c)
d)

Some kayakers coat the bottom of their kayaks with wax to make them more slippery. Kayakers wax their boats to
a) reduce their input force.
b) reduce the work output.
c)
d)

Metal cookware often comes with plastic handles. The plastic handles
a) are insulators.
b) are conductors.
c)
d)

A satellite in space experiences direct sunlight and heats up. During periods when it receives no direct sunlight,
a) the satellite cools off by radiation.
b) the satellite cools off by conduction.
c)
d)

During a space shuttle landing, a parachute deploys from the back of the shuttle as it taxis down the runway. In addition to the speed brake, the parachute helps the shuttle come to a complete stop. How does the parachute help during this process?
a) It increases friction by air resistance.
b) It increases heat transfer by radiation.
c)
d)

For an experiment, you place 15 g of ice with a temperature of –10oC into a cup and label it A. You also place 25 g of ice at the same temperature into another cup and label it B. Which of the following statements is true?
a) The average kinetic energy of the ice in cup A is equal to that in cup B.
b) The average kinetic energy of the ice in cup A is greater than that in cup B.
c)
d)

A man relaxes in his hot tub after a long day at work. His body temperature is 98.6°F. The temperature of the water in the hot tub is 102°F. How does heat transfer?
a) Heat transfers to his body from the water by conduction.
b) Heat transfers from his body to the water by convection.
c)
d)

During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. The energy stored in these covalent bonds is called
a) chemical energy
b) thermal energy
c)
d)

Which would best reduce the amount of energy needed to pull a wagon up a ramp?
a) reducing the friction between the wagon wheels
b) reducing the length of the wagon handle
c)
d)

Which kind of energy transformation occurs during skydiving?
a) gravitational to kinetic
b) kinetic to potential
c)
d)

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