Air Resistance Question Solutions

1. The force diagram is in the rounded square below and net force is not standard in a force diagram but included outside.

2. What is the acceleration of an object that has a weight of 300 N when 100 N of air resistance is encountered?

Note: down is positive in my solution

F_net = sum of forces = 300 + (-100) = 200 N down

 

F_W = mg

m = F_W / g

m = 300 / 9.8

m = 30.6 kg

 

F­_net = ma

a = F_net / m

a = 200/ 30.6

a = 6.5 m/s² down