The gravitational field strength is directly proportional to mass creating the field and inversely proportional to the square of the distance.

Inertia is a property of matter that causes it to resist changes in velocity (speed and/or direction). According to Newton’s first law of motion, an object with a given velocity maintains that velocity unless acted on by an external force. Inertia is the property of matter that makes this law hold true.

the gravitational force between the objects in pair 2 is greater than the gravitational force between the objects in pair 1 because the objects in pair 2 are closer to each other. The law of universal gravitation states that any two objects in the universe that have mass, without exception, attract each other.

Understand Newton’s Second Law of Motion, F = ma.

1. This law can be summed up with the equation F = ma, where F is the force, m is the mass of the object, and a is acceleration.
2. Using this law, we can calculate the force of gravity of any object on the surface of the earth, using the known acceleration due to gravity.

Since the moon has no atmosphere, the “terminal velocity” is equivalent to the escape velocity, which is about 2.4 km/s or about 5364 mph. If you were to jump off an infinitely tall cliff and fall towards the moon’s surface, you would reach up to this speed, and you would very likely die upon impact.

Multiplying 15.2 by . 8, we find that our safe lunar freefall distance is about 12.2 meters or 40 feet — under the assumption that at a given lunar site, an impact at 14 miles per hour is safe for us and our life support systems! In conclusion, even in the Moon’s reduced gravity, freefall acceleration still “adds up.”

You’d have to fall from higher up, but you could still die. The moon has 1/6th as much gravity on the surface, so you could survive a fall from 6 times higher up. Although, an astronaut’s spacesuit is very heavy, so the extra weight complicates things.

A falling human reaches terminal velocity in about 12 seconds, after which his speed will remain constant. He’ll fall about 450 meters in those first 12 seconds, and about 58 meters each second after that. There are 1609 meters in a mile. The fall would take just under 20 seconds.

The force of gravity determines how long an object will take to fall to the ground. On Earth, g = 9.8 m s−2 but on the Moon g is only 1.6 m s−2. Hence an object dropped from a given height will take longer to fall to the surface on the Moon than it would on the Earth.

Galileo had concluded that all objects, regardless of mass, fall at the same speed — however, the resistance caused by the air (as in the case of the feather in Earth’s atmosphere) can cause the feather to drop slower. Well, on the moon there is no atmosphere (a vacuum), so the objects should drop at the same speed.

On the Moon, objects fall 6 times more slowly than on Earth. The Moon, which is about 8,000 times smaller than the Earth, has a gravitational acceleration that is 6 times smaller than that of our planet.

In a vacuum (on the moon, say), all objects fall at the same speed, even if one is heavier than the others.

It is because it has a higher surface area to weight ratio, thus is slowed more by drag (or air resistance). On the moon there is no air, and no drag, and a hammer and a feather will fall at the same speed. The earth’s gravity pulls all objects down at the same rate(9.8 m/s 2), assuming there is no air resistance.

Acceleration of Falling Objects Heavier things have a greater gravitational force AND heavier things have a lower acceleration. It turns out that these two effects exactly cancel to make falling objects have the same acceleration regardless of mass.

Near the surface of the Earth, an object in free fall in a vacuum will accelerate at approximately 9.8 m/s2, independent of its mass. With air resistance acting on an object that has been dropped, the object will eventually reach a terminal velocity, which is around 53 m/s (190 km/h or 118 mph) for a human skydiver.

While even short drops can be lethal, people have survived horrendous falls. In very high falls, bodies can reach terminal velocity, the speed at which air resistance becomes so high it cancels out the acceleration due to gravity.