1. What are the SI units of force?
   1. kg * m^2 / s^2
   2. kg * m^2 / s
   3. kg * m / s^2
2. Joe pushes a box of mass 2 kg with a force of 10 N. It accelerates at
   1. 5 m/s^2
   2. 20 m/s^2
   3. 0.2 m/s^2
3. Joe pushes a box with force 10 N. Gravity pulls the box with force 8 N. The net force on the box is
   1. 18 N
   2. 2 N
   3. can't tell