(Bold underline emphasis is mine)nilic1 said:
Once the ball has left the hand, what influence can the hand possibly have on the ball afterwards? What forces, if any act on the ball once it has left the hand? Draw a FBD.
gneill said:
Does the force of its weight cause it to accelerate?nilic1 said:
As it stands, based upon the logic used to deduce each answer, neither of you is rightnilic1 said:
gneill said:As it stands, based upon the logic used to deduce each answer, neither of you is right
One of you can have the correct answer but for the wrong reasons (incorrect logic/working). You'd get few or no marks on a test or submitted homework for an answer based upon faulty logic.nilic1 said:
gneill said:
You are either misunderstanding what your teacher is saying or your teacher is saying something incorrect.nilic1 said:
The hand and ball become entirely independent once contact is broken. They share the same speed up to and including the instant of release. It is not a collision (the hand is not batting the ball, it is throwing it).
gneill said:
So basically you are saying that momentum cannot be conserved in such cases. Just to be sure.. one last example on the same idea.. Having two kids riding the same bike and one of them jumps of landing with zero velocity does not imply that the velocity of the bike will increase. According to you as the boy jumps off he cannot transfer momentum and so the law of conservation of momentum does not apply. Sorry for insisting but these are all examples that we were given and in which the law of conservation was applied.gneill said:
It is not conserved since there are external forces acting on parts of the system (the horse suddenly stops... what makes it stop?). Any part of the system that is not influenced by those forces will be unaffected and will be effectively their own isolated systems and will retain their own momentum separately.nilic1 said:
No! If he jumps off in such a way as to change his own velocity he must do so by imparting a force on the bike and/or other rider. That force interaction is the mechanism for momentum transfer between the elements of the system. In your horse example you did not have the rider jump or push off. You simply had the horse stopped while the rider slid off without friction, i.e., maintained his own momentum independently since there was no force acting between the horse and rider in the direction of motion.
When an object with mass is in motion, it has momentum. Momentum is defined as the product of an object's mass and velocity. When a ball collides with another object, such as a bat or another ball, some of its momentum is transferred to the other object. This results in a change in velocity, and therefore a change in speed, of the ball.
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, a ball with a larger mass will experience a smaller change in velocity and speed after a transfer of momentum compared to a ball with a smaller mass.
The angle of impact between two objects greatly affects the transfer of momentum. When the angle is perpendicular, all of the momentum is transferred between the objects. However, when the angle is not perpendicular, only a portion of the momentum is transferred, resulting in a smaller change in velocity and speed of the ball.
No, there are other factors that can also affect the speed of a ball, such as air resistance, friction, and the elasticity of the objects involved in the collision. These factors can either increase or decrease the speed of the ball after a transfer of momentum.
The transfer of momentum can be used to increase the speed of a ball by utilizing the principle of conservation of momentum. This means that the total momentum of a closed system remains constant before and after a collision. By manipulating the masses and velocities of the objects involved in the collision, the speed of the ball can be increased without violating this principle.