An someone help me please, thanks.

Awalk up the phase change graph worksheet

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9