Physics Review Question
Unit: Energy
Year: 1989 Question#: 2
Question: Base your answers to questions 2 through 4 on
the information and the diagram below. The diagram represents a block sliding
along a frictionless surface between points A and G.
As the block moves from point A to point B, the speed of the block will
be
(1 ) decreasing
(2 ) increasing
(3 ) constant
(4 ) zero
What is this question really asking?
Explanation by: Anna R
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Answer 1
decreasing
INCORRECT
When the block starts at point A the surface is flat and so the speed is
constant, but when it goes down to point B, the slope is down and gravity
pulls the block, accelerating it.
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Answer 2
increasing
CORRECT
When the block starts at point A the surface is flat and so the speed is
constant, but when it goes down to point B, the slope is down and gravity
pulls the block, accelerating it. return to top
Answer 3
constant, but not zero
INCORRECT
When the block starts at point A the surface is flat and so the speed is
constant, but when it goes down to point B, the slope is down and gravity
pulls the block, accelerating it. return to top
Answer 4
zero
INCORRECT
When the block starts at point A the surface is flat and so the speed is
constant, but when it goes down to point B, the slope is down and gravity
pulls the block, accelerating it. return to top
What's this question really asking?
What happens to the speed of an object as it goes down hill? return
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