Module 3 - 3.2.2 Motion with Non-Uniform Acceleration

Question 1

Drag

Answer 1

Opposes the motion of an object through a fluid

Question 2

Factors Affecting Drag

Answer 2

• velocity (drag ∝ velocity^2)
• cross sectional area of the object
• density of the fluid

Question 3

Forces on a Parachutist

Answer 3

• initially accelerates (weight is greater than drag)
• drag increases as it accelerates
• drag eventually equals weight (resultant force = 0)
• object continues to fall at terminal velocity

Parachute Opens
- sudden increase in drag
- resultant force acts upwards - speed decreases
- drag decreases as velocity decreases
- object reaches new terminal velocity