Take the tour ×  When I ride my bike, does half of the energy go
into the earth because of Newton's third law? Does the energy in
the earth transfer into heat upon my brakes when I utilize them?
If the earth was 2000 times less massive than it is, and I
applied the same energy to my pedal, would my bike move
(relative to an observer not connected to earth) at the same
speed as it would if the earth was normal?  I think if you think
about it these two questions are the same.  share|improve this
question Hi Velox. Your bike won't waste any fuel for earth.
Because the contact force is provided by the weight itself. And,
What do you mean by the phrase, energy in the earth... ? – 
Waffle's Crazy Peanut Mar 8 at 3:04 related and correct physics
in the answer by @Joshphysics at
physics.stackexchange.com/questions/56245/… –  anna v Mar 8 at
7:37 add comment  2 Answers  up vote 1 down vote accepted  No,
because even though the force that you exert on the earth is
equal and opposite to the force it exerts back on you,