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Science: Physics 科学：物理
 
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1 : The sun and the group of planets which move around it is called the __________.
solar system
sound system
Milky Way
comet
 The sun and the group of planets around it
 
2 : When you plug something in and turn on the switch __________ flows through the wires.
an ultraviolet ray
an electric current
a short circuit
a sonic boom
 Some electric wires
 
3 : __________ attracts objects made of iron and steel.
An electron
A magnet
A joule
A kelvin
 The object in the question
 
4 : The energy of motion is known as __________.
kinetic energy
positive charge
negative charge
thermal energy
 An example of this kind od energy
 
5 : The force that makes things fall to the ground is known as __________.
voltage
a watt
transformer
gravity
 A tennis ball
 
6 : __________ is the word used in physics for speed in a particular direction.
Matter
Pressure
Velocity
Neutral
 A speedboat