Matthew throws a ball straight up into the air. it rises for a period of time and then begins to drop. at which points in the ball’s journey will gravity be the greatest force acting on the ball?

Force due to gravity will be maximum when ball is nearest to the surface of Earth

Explanation:

As we know that the force due to gravity is given by

here

m = mass of object

g = acceleration due to gravity of earth

here acceleration due to gravity of earth varies with height from the surface and given as

so as object moves away from the surface of earth the force of gravity will decreases and when object is nearest to the surface then it is maximum

battery with hi vtge high val resist in series

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.