Weight (Force of Gravity):
* Direction: Always acts downwards, towards the center of the Earth.
* Magnitude: Depends on the object's mass and the gravitational acceleration (approximately 9.8 m/s² on Earth).
Air Resistance (Drag):
* Direction: Always acts opposite to the direction of the object's motion through the air.
* Magnitude: Depends on several factors:
* Speed of the object: The faster the object moves, the greater the air resistance.
* Shape and size of the object: A larger surface area and less streamlined shape experience more air resistance.
* Density of the air: Thicker air (like at higher altitudes) provides more resistance.
Visualizing the Forces:
Imagine a leaf falling from a tree:
* Weight: Pulling the leaf straight down.
* Air Resistance: Pushing against the leaf, slowing it down and causing it to flutter as it falls.
Key Points:
* Terminal Velocity: As an object falls, air resistance increases until it balances out the force of gravity. At this point, the object stops accelerating and falls at a constant speed called terminal velocity.
* No Air Resistance in a Vacuum: In a vacuum, there's no air to provide resistance, so the only force acting on an object is gravity. This means all objects would fall at the same rate (ignoring slight variations due to Earth's shape).
