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Qmechanic ♦
Qmechanic ♦
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I am a 9th grade student. I study about free fall, and I got very confuse. I have a couple of questions about it.

I learn two formulas of free fall,$$h=1/2gt^2$$$$v=gt$$

$$h=(1/2)gt^2$$

$$v=gt$$

From the height formula, the time object takes to fall to the ground don't depend on its mass. But I don't understand why when I drop a marker and a paper, the marker always fall to the ground first. I think that is because the marker is more massive than the paper, but why doesn't the formula has mass?

I hear a story about a penny drops from a very high building can kill people if it drop on people's head. I think it maybe because due to the height, the penny takes a long time to fall. And since velocity is promotional to time, the penny will have a large velocity when it land on top of people. So, is this true? Can penny drops from high building can kill people on the ground?

I am a 9th grade student. I study about free fall, and I got very confuse. I have a couple of questions about it.

I learn two formulas of free fall,$$h=1/2gt^2$$$$v=gt$$

From the height formula, the time object takes to fall to the ground don't depend on its mass. But I don't understand why when I drop a marker and a paper, the marker always fall to the ground first. I think that is because the marker is more massive than the paper, but why doesn't the formula has mass?

I hear a story about a penny drops from a very high building can kill people if it drop on people's head. I think it maybe because due to the height, the penny takes a long time to fall. And since velocity is promotional to time, the penny will have a large velocity when it land on top of people. So, is this true? Can penny drops from high building can kill people on the ground?

I am a 9th grade student. I study about free fall, and I got very confuse. I have a couple of questions about it.

I learn two formulas of free fall,

$$h=(1/2)gt^2$$

$$v=gt$$

From the height formula, the time object takes to fall to the ground don't depend on its mass. But I don't understand why when I drop a marker and a paper, the marker always fall to the ground first. I think that is because the marker is more massive than the paper, but why doesn't the formula has mass?

I hear a story about a penny drops from a very high building can kill people if it drop on people's head. I think it maybe because due to the height, the penny takes a long time to fall. And since velocity is promotional to time, the penny will have a large velocity when it land on top of people. So, is this true? Can penny drops from high building can kill people on the ground?

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user133882
user133882

I don't understand about free fall and its dependency on mass?

I am a 9th grade student. I study about free fall, and I got very confuse. I have a couple of questions about it.

I learn two formulas of free fall,$$h=1/2gt^2$$$$v=gt$$

From the height formula, the time object takes to fall to the ground don't depend on its mass. But I don't understand why when I drop a marker and a paper, the marker always fall to the ground first. I think that is because the marker is more massive than the paper, but why doesn't the formula has mass?

I hear a story about a penny drops from a very high building can kill people if it drop on people's head. I think it maybe because due to the height, the penny takes a long time to fall. And since velocity is promotional to time, the penny will have a large velocity when it land on top of people. So, is this true? Can penny drops from high building can kill people on the ground?