AS help!!
A man climbs slowly at a steady speed to the top of a ladder. What is the main energy transfer taking place for the man as he climbs?
A. Chemical to gravitational potential.
B. Chemical potential to kinetic.
C. Kinetic to gravitational potential.
D. Thermal (heat) to kinetic.
Why is the Answer A and nor B? Should kinetic be the main one since he is moving??
Also, for C, in the examiner report it says that no change in kinetic energy (as steady speed) means that it won't be converted to gpe. can someone explain why?
A. Chemical to gravitational potential.
B. Chemical potential to kinetic.
C. Kinetic to gravitational potential.
D. Thermal (heat) to kinetic.
Why is the Answer A and nor B? Should kinetic be the main one since he is moving??
Also, for C, in the examiner report it says that no change in kinetic energy (as steady speed) means that it won't be converted to gpe. can someone explain why?
Original post by andthings
A man climbs slowly at a steady speed to the top of a ladder. What is the main energy transfer taking place for the man as he climbs?
A. Chemical to gravitational potential.
B. Chemical potential to kinetic.
C. Kinetic to gravitational potential.
D. Thermal (heat) to kinetic.
Why is the Answer A and nor B? Should kinetic be the main one since he is moving??
Also, for C, in the examiner report it says that no change in kinetic energy (as steady speed) means that it won't be converted to gpe. can someone explain why?
A. Chemical to gravitational potential.
B. Chemical potential to kinetic.
C. Kinetic to gravitational potential.
D. Thermal (heat) to kinetic.
Why is the Answer A and nor B? Should kinetic be the main one since he is moving??
Also, for C, in the examiner report it says that no change in kinetic energy (as steady speed) means that it won't be converted to gpe. can someone explain why?
Not too sure. Maybe because 'steady speed' implies velocity doesn't change therefore KE doesn't change (KE=1/2mv^2) as mass and velocity are both constant here so main energy transfer will not be KE but the GPE gained from increasing altitude.
Also KE = GPE so if KE is constant then GPE is also constant so it can't be c.
Well for a question worded like that I'd look at the start and end situations
guy starts at the bottom of the ladder and ends at the top of the ladder... which means work has been done against gravity.
and the guys muscles are powered by the energy from the food he ate - and food is just a bunch of chemicals.
if you had a wordy, multi point question you could start to think about the kinetic energy that had to exist when moving between the bottom and the top of the ladder... but provided he didn't shoot off the top of the ladder all KE ended up being converted to GPE.
guy starts at the bottom of the ladder and ends at the top of the ladder... which means work has been done against gravity.
and the guys muscles are powered by the energy from the food he ate - and food is just a bunch of chemicals.
if you had a wordy, multi point question you could start to think about the kinetic energy that had to exist when moving between the bottom and the top of the ladder... but provided he didn't shoot off the top of the ladder all KE ended up being converted to GPE.
Yea I agree with what everybody else said, the there is no change in Kinetic Energy, it remains the same. Whereas GPE is gained because there is an increase/change in height
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