ForcesFriction: the resistance that occurs when two surfaces rub against each otherGravity: the force which causes any two objects to pull towards each other.
Drag: the resistance to motion caused by a gas or a liquid.
Thrust: the force which moves a plane forward.
Potential energy: energy stored by an object.Kinetic energy: the energy of a moving object.
Elastic energy: ability of a material to bend and bounce.
Other TermsPressure: occurs when a force acts on a certain areaTrajectory: the path of an object as it moves through the airVariable: factors that effect the result of an experimentVelocity: the speed of an object in a certain direction