Newton’s Laws and Free-Body Diagrams (4A) Practice Test

A $70,\text{kg}$ person stands still in an elevator that is accelerating upward. The forces on the person are weight $mg$ downward and the normal force $N$ upward. Based on Newton’s Laws, which statement is most consistent?

Assume the person is not holding onto anything and remains in contact with the floor.

A $10,\text{kg}$ sled is pulled across snow by a horizontal rope tension of $40,\text{N}$. The coefficient of kinetic friction is such that the friction force magnitude is $25,\text{N}$. What would be the net force acting on the sled?

Forces: tension (forward), kinetic friction (backward), weight, normal.