A-LEVEL PHYSICS: 4.3.5: Drag Forces (SaveMyExams) Flashcards
What are ‘Drag Forces’?
Drag Forces are Forces that Oppose the Motion of an Object Moving through a Fluid.
Examples of Drag Forces: (2)
-Friction
-Air Resistance
Drag Forces are always…
in the Opposite Direction to the Motion of the Object.
Drag Forces never…
Accelerate an Object or start Motion.
Drag Forces ___ Objects, or keeps them moving at a ___ ___.
Decelerate, Constant Speed
Drag Forces Convert Kinetic Energy into…
Heat & Sound.
What is ‘Lift Force’?
Lift is an Upwards Force on an Object moving through a Fluid. It is Perpendicular to the Fluid Flow.
Lift is an ___ Force on an Object moving through a Fluid. It is ___ to the Fluid Flow.
What does this cause?
Upwards, Perpendicular.
This causes an Equal & Opposite Reaction Force Upwards on the Wings (Lift) due to Newton’s Third Law.
A key component of Drag Forces is it ___ with the Speed of the Object.
Increases.
What is ‘Air Resistance’?
Air Resistance is an example of a Drag Force that objects experience when moving through the Air.
Air Resistance ___ with the Speed of the object.
Increases
Factors that affect Maximum Speed of an Object: (5)
-Cross-Sectional Area
-Shape
-Altitude
-Temperature
-Humidity
Why do aeroplanes travel at higher altitudes?
At higher altitudes, their is Less Air Resistance (since the Air is Less Dense).
Air Resistance Decreases the ___ Component of the ___ of a Projectile.
Horizontal, Velocity
