3 Motka duga 260 cm poduprta je u sredini . Na udaljenosti 20 cm od oslonca nalazi se teret
mase 120 kg. Kolikom silom je potrebno djelovati na kraju motke sa suprotne strane da bismo
podigli teret?​

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.