Focus On Physical Science: California Grade 8

Lesson 2: Pressure and the Buoyant Force

Standards Check

1.
Pressure ________ as one goes deeper under water. 8.c
A)stays the same
B)decreases
C)increases
D)does not exist
2.
Which best describes particles in a liquid? 8.c
A)less freely moving than a solid
B)more freely moving than a solid
C)more freely moving than a gas
D)completely unmoving
3.
Air exerts pressure because it has __________. 8.c
A)height
B)size
C)space
D)weight
4.
The force exerted on an area is known as __________. 8.c
A)pressure
B)specific heat
C)temperature
D)volume
5.
What best explains how a straw works? 8.c
A)Your mouth sucks liquid in.
B)The atmospheric pressure pushes down on the liquid's surface..
C)The atmospheric pressure in your mouth pushes down on the liquid.
D)The suction in your mouth is equal to atmospheric pressure.
6.
What causes a buoyant force? 8.c
A)the hydraulic pressure of the system
B)the force of the air on the liquid's surface
C)the force of the liquid pushing up an object
D)the volume of fluid
7.
Because lead has a lower density than liquid mercury, it will __________ in mercury. 8.c
A)melt
B)sink
C)dissolve
D)float
Grade 8
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