Phys Sci Ch 15 A Question Preview (ID: 19392)
Energy.
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Work is a transfer of
a) energy
b) force
c) mass
d)
What is transferred by a force moving an object through a distance?
a) motion
b) energy
c) force
d)
The energy of motion is called
a) kinetic energy
b) potential energy
c) thermal energy
d)
A small 20 kg canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?
a) 22J
b) 40J
c) 80J
d)
A 13 kg sled is moving at a speed of 3.0m/s. At which of the following speeds will the sled have twice as much kinetic energy?
a) 1.5 m/s
b) 4.2 m/s
c) 6 m/s
d)
An object's gravitational potential energy is NOT directly related to which of the following?
a) its height relative to a reference level
b) its mass
c) its speed
d)
Which of the following is an example of an object with elastic potential energy?
a) a stretched rubber band
b) a compressed basketball
c) all of the above
d)
Why is the gravitational potential energy of an object 1 m above the moon's surface less than its potential energy 1 m above Earth's surface?
a) The object's mass is less on the moon
b) The object's weight is more on the moon
c) The object's acceleration due to gravity is less on the moon
d)
A 4 kg cat is resting on top of a bookshelf that is 3 m high. What is the cat's gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s2?
a) 118 J
b) 12 J
c) 7 J
d)
The gravitational potential energy of an object is always measured relative to the
a) location where the object's kinetic energy is zero
b) position of maximum mechanical energy
c) reference level from which the height is measured
d)
Which of the following increases when an object becomes warmer?
a) thermal energy
b) nuclear energy
c) elastic potential energy
d)
The energy stored in gasoline is
a) chemical energy
b) electromagnetic energy
c) mechanical energy
d)
The total potential and kinetic energy of all the microscopic particles in an object make up its
a) chemical energy
b) nuclear energy
c) thermal energy
d)
Walking converts what type of energy into mechanical energy?
a) chemical
b) electromagnetic
c) nuclear
d)
Nuclear power plants are designed to convert nuclear energy into what type of energy?
a) chemical
b) electrical
c) geothermal
d)
Solar cells convert what type of energy into electrical energy?
a) chemical
b) electromagnetic
c) nuclear
d)
Which of the following statements is true according to the law of conservation of energy?
a) energy cannot be destroyed
b) energy can be converted from one form to another
c) all of the above
d)
If no friction acts on a diver during a dive, then which of the following statements is true?
a) the total mechanical of the system increases
b) potential energy can be converted into kinetic energy but not vice versa
c) (KE + PE)before = (KE + PE)after
d)
The mechanical energy of an object equals its
a) chemical energy plus its nuclear energy
b) kinetic energy plus its potential energy
c) nuclear energy
d)
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