1.A matchstick starts burning on rubbing it on the side of the matchbox because the heat produced by friction heats the chemical at the head of
the matchstick to their ignition temperature and makes it catch fire.
2.When you pedal, you'll feel a pop as the pedal goes around when your foot crests and the pedal (due to not being parallel to the crank) has to change orientation. Over time movements of the pedal relative to the crank will slowly strip out the threads on the crank, on the pedal, or both.
Answers & Comments
Answer:
1.A matchstick starts burning on rubbing it on the side of the matchbox because the heat produced by friction heats the chemical at the head of
the matchstick to their ignition temperature and makes it catch fire.
2.When you pedal, you'll feel a pop as the pedal goes around when your foot crests and the pedal (due to not being parallel to the crank) has to change orientation. Over time movements of the pedal relative to the crank will slowly strip out the threads on the crank, on the pedal, or both.
#CUTEKO
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