In projectile motion, horizontal velocity is the rate at which an object is traveling parallel to the earth. Scientists calculate horizontal velocity using the formula v = d/t, the same formula used to determine the speed of an automobile. In projectile motion, horizontal velocity does not change; however, the forces of gravity give the object vertical acceleration, causing it to stop when it hits the ground.Know More
On earth, the vertical acceleration due to gravity remains constant at 32.2 feet per second per second. If a quarterback throws a football in an upward pass, it has both vertical and horizontal velocities. Ignoring forces of friction due to air and wind resistance, the horizontal velocity remains the same throughout the ball's arched movement. However, the deceleration from gravity causes the vertical velocity to decrease until it reaches zero at the ball's maximum height and then to accelerate in a downward direction as it continues to move toward the receiver. If these forces are working according to the quarterback's plan, the ball is at the exact height for the receiver to complete the pass.
The military uses horizontal velocity and projectile motion in warfare. It allows them to calculate the distance a bullet travels before hitting the ground. If an airplane drops a bomb, its horizontal velocity is the same as the plane. In order for the bomb to hit its target, the bomber must consider both horizontal velocity and vertical acceleration.Learn more in Motion & Mechanics
When the acceleration of an object is zero and the velocity is positive, the object continues to move at a steady velocity in the same direction. The object cannot be changing direction because direction change results in non-zero acceleration.Full Answer >
An object does not have a varying speed if its velocity is constant. A constant velocity implies that an object is moving in a straight line at an identical rate over time.Full Answer >
When an object reaches its terminal velocity, it can no longer accelerate, so its acceleration becomes zero, and it falls at a constant speed. As an object falls freely through the air, it has two forces acting upon it: gravity and drag.Full Answer >
Instantaneous speed describes the speed of a moving object at any given moment. Unlike average speed, it is not a collective number based on the total distance and time of travel. Instead, it's a snapshot of one particular instant within a journey.Full Answer >