Question

Why does a skydiver need a parachute to land safely?

(5 points)
Responses

It decreases air resistance and slows the skydiver to a safe speed
It decreases air resistance and slows the skydiver to a safe speed

a parachute isn't needed in order for a skydiver to safely land
a parachute isn't needed in order for a skydiver to safely land

It increases air resistance and slows the skydiver to a safe speed
It increases air resistance and slows the skydiver to a safe speed
Question 2
What force causes objects falling near Earth's surface to slow down?(5 points)
Responses

Air Resistance
Air Resistance

Centripetal Force
Centripetal Force

Gravity
Gravity

Terminal Velocity
Terminal Velocity
Question 3


If a golf ball and a baseball are dropped in the absence of air resistance, which ball will hit the ground first?

(5 points)
Responses

the golf ball
the golf ball

they will hit at the same time
they will hit at the same time

the baseball
the baseball
Question 4
If a feather and a baseball are dropped in the presence of air resistance, which ball will hit the ground first?(5 points)
Responses

the feather
the feather

they will hit at the same time
they will hit at the same time

the baseball
the baseball
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Answer 1

1) It increases air resistance and slows the skydiver to a safe speed.
- The parachute raises drag so descent speed is reduced to a survivable rate.

2) Air Resistance.
- Drag opposes motion and can slow falling objects near Earth's surface.

3) they will hit at the same time.
- Without air resistance all objects accelerate at the same rate due to gravity.

4) the baseball.
- With air resistance the feather is slowed much more relative to its weight, so the heavier, denser baseball falls faster.