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# Questions tagged [drag]

The force on a body resulting from it's motion through a fluid (gas or liquid). This force is directly opposed to the direction of travel.

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### Optimum baseball distance from velocity

I am trying to come up with an equation that is able to approximate the magnitude of velocity of a baseball after it travelled a certain distance in the $x-$direction given the ball is thrown at an ...
26 views

### Unreasonable values obtained for a simplified helicopter in equilibrium

I'm attempting to analyse a simple model of a helicopter. For one of my equations, I'm summing the forces in the x direction (forward motion). There are only really two forces acting on the helicopter,...
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### Would an adhesive surface have more air resistance?

Imagine spreading double-sticky tape all over the surface of a car or a plane. Would there more significantly more aerodynamic drag as a result of the adhesive 'sticking' to air molecules and slowing ...
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### Shooting a bullet in motion

If a bullet is shot from a firearm from a moving car in the direction of movement, would the speed gained with respect to the car be same as the speed of a bullet that is shot from an immobile gun? I’...
82 views

### What causes drag crisis?

While reading the Wikipedia article on Drag Crisis, I found: The drag crisis is associated with a transition from laminar to turbulent boundary layer flow adjacent to the object. While, the ...
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### Lift and drag forces in parachuting

EDIT: guys, I am not a physicist and it is not my study field, So even if you see my question is silly to be answered, I hope you can give me a clue. I hope you are doing well. I have some questions, ...
84 views

### Is the sensation of falling purely due to air resistance?

When I jump off of something, even with eyes closed I can be pretty certain that I'm falling due to the associated sensation of falling. However, as gravity should be affecting each of my internal ...
1 vote
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### How is momentum conserved when dealing with viscous substances?

Say we drop a ball into a bucket of honey. The falling ball will have a downwards momentum, but once falls into the honey, it will slow and then stop with no apparent opposite momentum. In such a case,...
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### What is the difference between drag coefficient and skin friction coefficient?

I am trying to understand what caused drag. For example when fluid is passing a plate, if the fluid is still laminar at the end of plate, the drag coefficient could be evaluated as twice friction ...
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### What is the hydrodynamic interaction (Oseen kernel)?

I am reading through the paper "Dynamics of Membranes Driven by Actin Polymerization" by Nir S. Gov and Ajay Gopinathan. In this paper, the authors develop a PDE model to explore the ...
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### Calculating the angle an object has to be launched at with simulated drag [closed]

I’m trying to calculate the angle(s) a projectile has to be launched at in a game that has a simulated drag which reduces the velocity by 2.5% of the current velocity per tick (25 milliseconds). This ...
1 vote
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### Why does static friction opposes force vector ...but kinetic friction opposes velocity vector?

MY ANSWER- lets say a body is on rest and a force is applied thats slowly increasing ....the tiny bumps and groves between surfaces will apply a normal until the force is big enough to break through .....
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### A curveball in vacuum

So I’m still new to physics so forgive me if it’s a simple question. Assume no air resistance. Suppose I throw a curveball at 30 m/s at an angle of 10$^\circ$ from the horizontal. Assuming I’m not ...
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### Is it possible to convert separated flow back to attached?

Sometimes you cannot easily create ideal single streamlined shape... Would it be possible to attach separated flow again somehow? The point is - you have some base setup (average cyclist) and want to ...
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1 vote