Question

Skiers use long flat skies to slide over snow because long flat skies increase the area of contact, which

• A.
  Increase thrust
• B.
  Decrease thrust
• C.
  Increase pressure
• D.
  Decrease pressure

Answer 1

The correct option is D

Decrease pressure
$\text{Pressure}=\frac{\text{Force}}{Area}$

If force remains constant, then:
$Pressure\propto \frac{1}{Area}$

Skiers use long flat skies to slide over snow because long flat skies increase the area of contact, which decreases the pressure on the snow. This enables the skier to slide over the snow easily.

Hence, the correct answer is option (4).