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Conservation of Energy
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;
and do these exercises:
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and
Is Energy Added or Removed.
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An object is dropped. There is air friction.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A moving object is stopped by friction
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
An object speeds up.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
An object slows down.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A spring is compressed.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A moving object is stopped.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A moving object compresses a spring and stops.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
An object on the ground is lifted or pushed up.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
An object is thrown up into the air.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A force causes an object to move.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
An object is dropped.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A dropped object while it is part way down.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
A stopped object is pushed up a ramp.
Which of the following is correct?
?
Ep = Ek
?
0 + W = Ek
?
Ek = Ep
?
0 + W = Ep
?
Ek = PEel
?
Ek - W = 0
?
0 + W = PEel
?
Ek
before
- W = Ek
after
?
Ek
before
+ W = Ek
after
?
Ep - W = Ek
?
Ep = Ek + Ep
OK
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