ANY UNBALANCED FORCE CAUSES ACCELERATION as long as the force continues to be applied to the object. When the force stops being applied, the moving object continues to move at a constant speed as long as no force acts on it.
The boy will apply a force on the ball when he throws it.
* Once the ball leaves the players hands the only force acting on the ball is gravity (neglecting air resistance).
* The initial force of the player on the ball changed the balls state of motion.This means that the ball was stationary when the player held the ball in one place. But, when he threw it the ball was set in motion by the force he applied on the ball. When the player released the ball, he no longer is in contact with the ball, thus he is not applying a force on the ball. The ball moves at a constant speed in the direction it was thrown due to the object’s inertia. Objects moving through the air are called projectiles.
For more information about an object’s inertia, see INERTIA.
| * The initial contact force propelled the ball in a specific direction. Once the force was removed, the ball continued to move in a straight line at constant speed due to its inertia. Without any other forces acting on the ball it would continue in a straight line at the same speed.
* On Earth, if air resistance is not considered, the ball has one force acting on it and that is gravity. * Gravity is a force that pulls things down toward Earth’s surface. * Assuming the ball it thrown in a direction that is parallel to the ground. Also assume there is no air resistance. With gravity being the only force acting on the ball, its path will curve downward toward the ground. Unless it hits something in flight, the ball will continue to move in a curved path until it strikes the ground. * At any one point on the ball’s path, two things are happening to the ball: 1. It has its initial speed in a forward direction parallel to the ground. 2. Gravity is the only force acting on it and it is pulling the ball straight down toward the ground. * When a force continues to act on an object, it causes the object to accelerate. On Earth, gravity causes all falling objects to accelerate at the same rate, which is 9.8 meters per second per second. This is expressed as9.8 m/sec2. This means that for every second of time that passes, the falling objects speeds up 9.8 meters/sec. At the end of two second the object would be moving at a speed of 19.6 meters/sec and at the end of three seconds, the object would be falling at a speed of 29.4 m/s and so on. Again, air resistance is not being considered. For an activity demonstrating how space craft orbit Earth, see SPACE CRAFT:INERTIA. Janice VanCleave’s Astronomy for every Kid
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