Educational worksheet on forces and parachutes, illustrating skydiver stages and explaining air resistance, gravity, and terminal velocity.

Problem Analysis:

The task involves understanding the physics of a skydiver's descent, focusing on forces such as gravity, air resistance, and terminal velocity. The goal is to fill in the blanks with appropriate terms from the provided word bank and match them with the correct images of the skydiver's stages of descent.

Word Bank:

- Constant
- Terminal
- Upward
- Downward
- Increases
- Decreases
- Weight
- Same
- Accelerate
- Decelerate
- Resultant
- Large

Solution:

#### Sentence A:
She opens her parachute. There is now a very _______ air resistance force so she starts to _______.

- When the parachute is opened, the air resistance force becomes large.
- This large air resistance force causes the skydiver to decelerate (slow down).

Filled Sentence:
She opens her parachute. There is now a very large air resistance force so she starts to decelerate.

Match: This corresponds to the image where the parachute is fully open, and the skydiver is slowing down.

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#### Sentence B:
As she accelerates the air resistance force _______. Now there is a force acting in the opposite direction to her _______.

- As the skydiver accelerates, the air resistance force increases.
- The force acting in the opposite direction to her motion is the downward force of gravity.

Filled Sentence:
As she accelerates the air resistance force increases. Now there is a force acting in the opposite direction to her downward.

Match: This corresponds to the image where the skydiver is falling freely but has not yet opened the parachute.

---

#### Sentence C:
The skydiver only has the downward force of her _______ pulling down on her – she starts to _______.

- The downward force is due to her weight.
- Without any significant air resistance initially, she starts to accelerate.

Filled Sentence:
The skydiver only has the downward force of her weight pulling down on her – she starts to accelerate.

Match: This corresponds to the initial free-fall stage where the skydiver is accelerating rapidly.

---

#### Sentence D:
Her _______ is now equal to the _______ force from the ground. The _______ force is again zero.

- When the skydiver lands, her weight is balanced by the upward force from the ground.
- The resultant force is zero because the forces are balanced.

Filled Sentence:
Her weight is now equal to the upward force from the ground. The resultant force is again zero.

Match: This corresponds to the final image where the skydiver has landed safely on the ground.

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#### Sentence E:
As she accelerates faster the air resistance force _______. It is now the _______ as her weight. She now moves at a _______ speed because the _______ force acting on her is zero. She is now at her _______ velocity (She cannot go any faster).

- As the skydiver accelerates, the air resistance force increases.
- Eventually, the air resistance force becomes same as her weight.
- At this point, the resultant force is zero, and she moves at a constant speed.
- This constant speed is called terminal velocity.

Filled Sentence:
As she accelerates faster the air resistance force increases. It is now the same as her weight. She now moves at a constant speed because the resultant force acting on her is zero. She is now at her terminal velocity (She cannot go any faster).

Match: This corresponds to the image where the skydiver is falling steadily without opening the parachute.

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#### Sentence F:
As she decelerates the air resistance force on her parachute _______ until it is the _______ size as her weight. She is now moving with a _______ speed until she hits the ground – a new, slower _______ velocity.

- As the skydiver decelerates, the air resistance force decreases.
- Eventually, the air resistance force decreases to the same size as her weight.
- She is now moving with a constant speed until she hits the ground.
- Upon landing, her velocity becomes zero.

Filled Sentence:
As she decelerates the air resistance force on her parachute decreases until it is the same size as her weight. She is now moving with a constant speed until she hits the ground – a new, slower zero velocity.

Match: This corresponds to the image where the parachute is open, and the skydiver is descending slowly.

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Final Matches:

1. Image 1 (free fall): Sentence C
2. Image 2 (acceleration): Sentence B
3. Image 3 (terminal velocity): Sentence E
4. Image 4 (parachute open, deceleration): Sentence A
5. Image 5 (slower descent): Sentence F
6. Image 6 (landing): Sentence D

Arrows for Forces:

- Draw arrows showing the forces acting on the skydiver:
- Downward arrow (long): Gravity (Weight)
- Upward arrow (short initially, longer later): Air Resistance
- Resultant force arrow (initially long downward, then shorter, then zero): Net Force

Final Answer:

\boxed{
\text{A: large, decelerate; B: increases, downward; C: weight, accelerate; D: weight, upward, resultant; E: increases, same, constant, resultant, terminal; F: decreases, same, constant, zero}
}