Homework can be a Drag
Density of Air = 1.22 kg/m 3
Name ___________________
FD = ½ ρ v2 Cd A
1. A Toyota Prius has a Cd of 0.25 and a front surface area of 2.17 m 2.
a) If it is going 11.2 m/s (25 mph) what will its drag force be?
b) If it is going 22.4 m/s what will its drag force be?
2) If a car with a 2.85 m2 front experiences 87.6 Kg m/s2 of drag force when going 8 m/s through
air what is its Drag Coefficient (Cd)?
3) A submarine has a drag coefficient of 0.279 and experiences 8.7 Kg m/s 2 of drag
going through water with a density of 998 kg/m3 when going 4 m/s, what is its surface
area?
4) What is the speed of a plane experiencing 634,000 Kg m/s2 of drag. Its surface area
is 22 m2 and its Cd is 0.21.