Physics, 13.10.2019 11:00 nelyanariba981p555ve

The force that one surface exerts on another when the two rub against each other is called
a. friction.
b. acceleration.
c. inertia.
d. gravity.

the law of universal gravitation states that any two objects in the universe that have mass, without exception,
a. attract each other.
b. repel each other.
c. combine to provide a balanced force.
d. create friction.

answer both

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