Focus On Physical Science: California Grade 8

Lesson 3: Sinking and Floating

Standards Check

1.
A boat floats on water because _______. 8.d
A)the boat's downward weight has nothing to do with the buoyant upward force
B)the boat's downward weight is greater than the buoyant upward force
C)the boat's downward weight is less than the buoyant upward force
D)the boat's downward weight is balanced by the buoyant upward force
2.
A rock sinks in water because _______. 8.d
A)the rock's downward weight is less than the buoyant upward force
B)the rock's downward weight is balanced by the buoyant upward force
C)the rock's downward weight is greater than the buoyant upward force
D)the rock's downward weight has nothing to do with the buoyant upward force
3.
A hydrometer measures the ________ of a liquid. 8.d
A)volume
B)density
C)mass
D)height
4.
Objects can float in which of the following? 8.d
A)both liquids and gases
B)solids only
C)liquids only
D)solids, liquids, and gases
5.
It is possible to make a boat that will float, if the boat is made of which of these materials? 8.d
A)wood only
B)wood or metal
C)metal only
D)neither wood nor metal
6.
A helium balloon will eventually sink when _______. 8.d
A)the balloon's density is equal to the density of the air.
B)the balloon's density becomes less than the density of the air.
C)the balloon's density becomes greater than the density of the air.
D)the balloon reaches outer space.
Grade 8
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