Paracaidismo

The video explains how skydivers use air resistance to land safely. Initially, gravity pulls the skydiver down, but air resistance acts in the opposite direction. As the skydiver falls, the forces of gravity and air resistance balance, reaching terminal velocity. When the parachute opens, it increases the surface area, creating more air resistance and slowing the skydiver to a new terminal velocity, allowing a safe landing.

What type of friction helps skydivers land safely?

• Air resistance

• Rolling friction

• Static friction

• Sliding friction

What happens to the skydiver's speed when gravity and air resistance are balanced?

• The speed increases

• The speed remains constant

• The speed decreases

• The speed becomes zero

What is the term for the constant speed a skydiver reaches when falling?

• Average velocity

• Terminal velocity

• Final velocity

• Initial velocity

How does opening a parachute affect the skydiver's descent?

• It eliminates air resistance

• It decreases air resistance

• It increases air resistance

• It has no effect on air resistance

What happens to the skydiver's terminal velocity after the parachute opens?

• It remains the same as before

• It becomes slower than walking speed

• It becomes faster than walking speed

• It becomes zero