when a skydiver jumps out of a plane, the dominant force is gravity, pulling him/her towards the ground, although some air resistance is also acting on him/her, allowing him/her to fall at a steady speed (not dropping like a stone), so the forces acting on the skydiver are almost balanced. of course, all that changes when the parachute opens. then the air resistance greatly increases, drastically slowing the descent down to earth.
Gravity and wind resistance.
Coplanar forces systems have all the forces acting in one plane. It also means that all forces act within a single plane instead of three dimensions.
When all the forces of a force system act in one plane it is called coplanar force system. If the forces act in more than one plane then it is forces in space. In this case forces are not contained in one plane. When all the forces of a system pass through a common point they are called concurrent forces. Thus we have concurrent coplanar forces when all forces are in one plane and pass through a common point. Also when forces in space pass through a common point we have concurrent forces in space.
Coplanar forces are a set of forces all of which act in the same plane. Non-coplanar forces are a set of forces in which at least one act in a direction incline to the plane formed by two of the forces.
Lift, thrust, gravity, and drag (friction)
The four forces of flight during flight are lift gravity thrust and drag
Lift: The force that keeps the plane flying.Drag: The force that slows down the plane. Weight: Theattractionto the ground.
These are forces which act in the same plane (coplanar, not coplanner!) and that their lines of action all meet at a single point.
Coplanar just means that all forces act within a single plane, rather than in three dimensions. Examples aren't really necessary -- it's really a mathematical abstraction, because in the real world forces act in three dimensions.
Coplanar (not coplanner) forces are those that act in the same plane and, if they are parallel, then their lines of action are parallel: that is, the perpendicular distance between the lines of action is a constant.
Forces don't act on other forces - forces act on objects.
4 forces act on planes Lift pulls the plane up Gravity pulls it down Thrust pushes it forward Drag pulls it back These 4 forces together help move the plane through the air and without these forces an airplane wouldn't fly When an airplane takes off the thrust is thus increased and the plane can take off from the ground