3. Which of the following are true?
L Friction always opposes motion.
IL
Friction is due to the two surfaces in contact.
IL Friction is always equal to the applied force.
a I and II
b.
II and III
C.
I and III
d. llad
4. Electrostatic force is
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. Which of the following are true?
L Friction always opposes motion.
IL
Friction is due to the two surfaces in contact.
IL Friction is always equal to the applied force.
a I and II
b.
II and III
C.
I and III
d. llad
4. Electrostatic force
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