Because rectilinear motion takes place in one straight line, examples include a train following a straight set of tracks, a baseball thrown in a gravity-free vacuum or a penny that someone drops from the top of a tall building, heading straight to the ground. Rectilinear motion is the opposite of curvilinear motion, which involves movement along a fixed curve.Know More
When studying physics, the most common examples of rectilinear motion use falling objects. Because of the effects of gravity and friction on anything moving in a horizontal direction, having those objects continue to move in a perfectly straight line is extremely unlikely. Even in the case of the train, having a perfectly straight track for the complete duration of the trip is not a realistic scenario. However, tracking a falling object involves a straight line, because gravity forces that object to take the straightest path to the ground.
Other physics problems examine the effects of forces such as gravity on an object's rectilinear motion. One common example involves shooting a projectile up into the air. Whether one shoots the object straight up, perpendicular to the ground, or at an angle, gravity almost immediately begins to take effect, slowing the projectile down and, in the case of the angle, turning the rectilinear path into a curvilinear one.Learn More
Friction allows objects in motion to return to a state of rest. Without friction, an object set in motion would be unable to stop moving.Full Answer >
In physics, "momentum" is a property that describes an object's motion. Linear momentum, the momentum of an object moving in a straight line, is the mass of the object multiplied by its velocity.Full Answer >
Retrograde motion was first described by Ptolemy as part of his solar system model. He described the motion of the planets in relation to the stars using the terms "retrograde" for westward motion and "prograde" for eastward motion.Full Answer >
Water turbines convert the motion of moving water into rotating mechanical energy by catching the water with large blades. They are important to the structure and function of hydropower plants. There are different models of water turbines, but all perform the same basic function of converting the energy of the moving water into the revolutions of a shaft.Full Answer >