• # Will balls strike ground at same time ?

Wants to know whether two balls of different masses strike the ground at the same time? Just check out here to know from our experts.

If two balls of same size but of different masses are dropped from the same height at same time. They are free falling objects. Suppose one of them is of 10 kilogram and other of 2 kilogram weight. I think that they strike at a time on ground in vacuum. Will they strike ground at same time in normal environment?

• Yes. They will strike the ground at the same time. Acceleration is not depend on mass. Here the gravitational force is creating the acceleration. Gravitational force is same. Distance is same. Acceleration is same as it is gravitational force only. Hence both will strike the ground at the same time. If height is different two balls then time will change. The drop time is different they will not strike at the same time.

drrao
always confident

• They will strike the ground at the same time whether it is vacuum or air. The difference of mass has nothing to do as their acceleration due to gravity is same and is known as 'g'.
This is a very interesting thing that mass has nothing to do for the time it takes to reach ground.

Thoughts exchanged is knowledge gained.

• Ha ha! i was never that good at Physics, may be a bright mind or a bright kid can answer better. Jokes apart, the answers by the above two members makes sense and thanks for another tit-bit of knowledge.

• Scientifically speaking two objects having different masses and released from a height will reach ground at the same time if the medium is vacuum.

As air is having very small density we can neglect it's floating effect and practically different masses will fall at the same time.

Let us see the similar question by changing one mass to a iron ball / pallet of 0.5 gram and a bird feather of same mass. What will happen now?

In vacuum they will reach ground at the same time but in open air because of buoyancy of air the floating action will be there and the bird feather because of its design will have a upward thrust by air and float and reach the ground later than the iron ball /pallet. So effect of air will also be there.

So the theorem is true for vacuum but as the air uplift is a small force so for the bigger masses the time is practically same in real life situations.

Knowledge is power.

• Yes, both the ball will touch the ground at the same time.

Both the balls are being attracted by the earth and the rate of acceleration is same, i.e, g=9.8 meter/second (square). As g doesn't depend on the mass, both the balls will hit the ground at the same. [Applicable formula: s=ut+1/2gt(square); here s is same, u is same=0, g is same=9.8. So, t will also be same.]

Please refer to Galileo's famous experiment at Pisa's leaning tower. He did the same experiment.

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• Yes, both the masses will reach the ground at the same time.
Let h be the height in meter from where two particles of different masses are dropped, then by the formulae,
h = ut+ 1/2 gt( square) and also the initial velocity u =0 when the particles are being dropped,
h = 1/2 gt( square), where g being acceleration due to gravity and the value of the same is 9.8 m/sec.( square)
For both the particles the value of h will remain the same.
However, Galileo conducted this experiment in vacuum but supposing the air resistance is negligible, both the particles will strike the ground at the same time.