How does a ball move with gravity heling it?
816746
I can't understand your question but, nothing moves with the aid of gravity, rather, things stop moving because of other forces acting upon them, e.g. drag, friction, etc. In space, there is no gravity (or much much less than on earth), which is why if you set a ball in motion in space, it would theoretically keep going forever, unless something got in it's way.
792649
If it were on a frictionless surface, the ball (or any object) would remain stationary relative to the ground and slide backward relative to the wagon, until it fell off the wagon (assuming there's nothing preventing that). But since the object is a ball, I'm guessing the question involves the ball rolling, which will happen if there is friction. In that case the ball won't remain stationary since it is being accelerated in rotation, and the tangential force needed to do that, applied through frictional contact, also accelerates the ball forward. The ball will move forward relative to the ground, but backward relative to the wagon.\nSo not enough information has been supplied for a definite answer.
655647
Force is a vector and it can be -ve.\n\nThrow a ball up. If you take its displacement upwards to be +ve then the gravity pulling it down is in the opp. direction and hence -ve. Thus the force acting on it is -ve.\n\nIts all a question of taking references.
503790
Gravity always accelerates the ball in the "Y" direction such that the force pulls the ball downward.\n\nEven if the ball stops in midair, it is still being accelerated at 9.8m/sec^2\n\nThis means no matter how hard you hit it in the x-direction, it will always be accelerating at 9.8m/sec^2 in the y-direction.\n\nThat is a major concept in kinematics.  The motion in the x and y directions are independent of one another!
632008
Gravity, its weight, friction\nThat's about it.
465426
When an object is thrown from a top of a tower in a horizontal direction, it is having a horizontal uniform motion and an accelerated downward motion due to the gravitational force. The path is a parabola.\n\nSimilarly, the charged particle is having a uniform motion and an accelerated motion due to the electrical force perpendicular to the uniform motion.  \n\nTherefore, the path is a parabola.
705043
As the ball hits the ground, its momentum causes its elastic body to compress itself against the ground until enough force had been applied through enough distance to cancel the momentum of the ball and bring it to a stop.  At the instant the ball comes to a stop, it has energy stored in it due to the compression of its body against the ground.  This compressive energy is then released in pressing against the ground, causing the ball to accelerate upward.
433903
The ball will reach a maximum height, then the velocity of gravity (9.8 meters/second) would cause it to travel downward until another force acts upon it (according to Newton's laws of motion). However, this does not account for other forces, such as air resistance. The rate at which the ball falls and the air resistance acting upon it will depend on the properties of the ball (surface area, weight, etc.). If the ball is inside a vacuum, it is said to be in free fall (as the only force acting upon it is gravity) and there is no other force acting upon it. If the ball is allowed to fall long enough, it will reach a point of terminal velocity, where it cannot fall any faster (the force of air resistance will equal the weight of the object)
1013806
The ball's vertical acceleration will constantly decrease due to the gravitational force. This happens until the ball reaches the apex of it's path, then will start to accelerate constantly back down. This vertical acceleration happens independent of the horizontal path.
728879
basketball. When you shoot the ball to make a basket, the force with which it is thrown, combats with gravity. This determines at what point the ball will start to fall towards the basket.
131522
it depends on how you orient your coordinates, but the gravitational acceleration opposes the velocity of the upward traveling ball, so if up is positive then yes the acceleration due to gravity is negative
755334
Analyze the forces at the top of the loop:\n\nThe force of gravity pulling the ball downward,\nthe upward centrifigal force keeping the ball on the track,\nand the force of the track pushing the ball downward.\n\nThe answer to the question is when the centrifigal force is exactly equal to the weight, so the force of the track equals zero.\nmg=mw^2R\nw is the angular velocity\nw=sqrt(g/R)\n\nOnce you know the angular velocity, compute the equivalent linear velocity by mutlipying by R\n\nthen use mgh=1/2mv^2\nto compute h\n\nWhere is point Q?\n\nj
193718
this would all depend on the angle of the secant, the depth of it, and, of course, the velocity at which you would be traveling upon entering the opening.  In general, you would simply roll till you ran out of momentum.  gravity still pulls to the core.
895329
When you hold a ball up in the air, it develops potential energy because gravity wants to pull it down.  As the ball is dropping, that potential energy became kinetic energy, but loses some energy because of friction with the air.  At impact more energy is lost to the ground via thermodynamics (heat loss) and deflection (strain energy transfer).  The ball bounces back up with the remaining energy.  Something like that, better to ask a physics professor in high school or college :)
853730
The forces are gravity down  and air drag up.\nIf you want your egg to land softly, one way is to increase its coefficient of drag -- give it a parachute.
436294
FOLLOW THE BOUNCING BALL
450269
Well if the ball is hollow then it will float. If the weight of the water displaced is greater than the weight of the object then it will float because the object is lighter then the area of water it is taking up.