What two factors affect the amount of friction that act on a moving object?

What is the relationship between ozone and smog?

Aipal measures a circuit at 1.2 a and 24 . using ohm’s law, what can he calculate for the circuit?

Vi. on another planet, a spring with constant 4.7 n/m is set up and allowed to expand verticaly freely. 8.4kg mass is placed on the spring and the spring extends 5.28m. calculate the exected extension on earth.