Find the net force including its direction when each force acts in the direction indicated.
1. Find the acceleration of an automobile of mass 1500 kg acted upon by a driving force of 2200 N that is opposed by a frictional force of 450 N.
2. A truck of mass 13,100 kg is acted upon by a driving force of 8900 N. The motion is opposed by a frictional force of 2230 N. Find the acceleration.
3. A speedboat of mass 30.0 slugs has a 300-lb force applied by the propellers. The friction of the water on the hull is a force of 100 lb. Find the acceleration.
4. A truck with a mass of 14,000 kg is pushed with a force of 9200 N. If the frictional force is 2150 N, what is the truck’s acceleration?
5. A trailer has a mass of 5000 kg. It is pulled by a truck with a force of 8750 N. If the frictional force is 2000 N, what is its acceleration?
6. A refrigeration unit on a job site must be slid into place. If the frictional force of 975 N opposes the motion and two workers apply a total force of 1095 N to the unit, what is the net force on the unit?
7. A light truck of 2000 kg mass has to be pushed with a force of 1975 N. If the frictional force is 550 N, what is its acceleration?