Motion under gravity: When an object is subject only to the force of gravity, its motion is described by a single variable called displacement (s). The disp...
Motion under gravity:
When an object is subject only to the force of gravity, its motion is described by a single variable called displacement (s). The displacement is the distance the object has moved from its starting position to its final position.
Factors affecting motion:
Initial velocity: The velocity of an object when it starts motion is called its initial velocity (v0).
Gravity: The force of gravity pulls objects towards each other with a constant force called the acceleration due to gravity (g).
Air resistance: Air resistance is a force that opposes the motion of an object moving through a fluid (such as air). The magnitude of air resistance depends on factors such as the shape of the object, the velocity of the object, and the properties of the fluid.
Motion under air resistance:
When an object is subject to both the force of gravity and air resistance, its motion is more complex. The presence of air resistance causes the object to move more slowly and to reach a final position that is higher than the final position it would reach in the absence of air resistance.
Examples:
A ball thrown vertically into the air will reach a maximum height before falling back to the ground due to air resistance.
A skydiver jumping from a plane experiences air resistance that slows down their fall and helps them reach the ground safely.
An airplane cruising through the air experiences air resistance that pushes it forward, allowing it to fly faster than it could if air resistance were not present