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Physicists vs Normal People (lemmy.blahaj.zone)

submitted 1 day ago by [email protected] to c/[email protected]

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[–] [email protected] 27 points 1 day ago (4 children)

Is it an accelerator? Or is it a jerk pedal? Technically the gas pedal controls the change in acceleration, right?

I definitely have friends

[–] [email protected] 4 points 10 hours ago

No, if there is constant pressure on the accelerator, there is a constant acceleration on the car.

The jerk comes with the rate of change of pressure on the pedal (e.g. if you stomp on it)

That would make the driver the jerk 🤔

[–] [email protected] 24 points 1 day ago (1 children)

Technically the gas pedal controls the change in acceleration, right?

Technically it controls the amount of air and/or fuel delivered to the engine (in a gas engine, the pedal directly controls airflow; in a diesel engine it directly controls fuel flow)

[–] [email protected] 0 points 7 hours ago

A valve controller, yes

[–] [email protected] 5 points 1 day ago

Increasing speed -> acceleration Decreasing speed -> negative acceleration Changing direction -> Vector acceleration(change in velocity)

[–] [email protected] 10 points 1 day ago* (last edited 1 day ago) (1 children)

Acceleration in physics terms just means a change in velocity. Velocity is speed in a given direction. The steering wheel, gas pedal, and brake pedal all accelerate the vehicle.

[–] [email protected] 25 points 1 day ago (1 children)

Acceleration in physics terms just means a change in velocity. Velocity is speed in a given direction

They definitely know that, given that they know that change in acceleration is called jerk

[–] [email protected] 10 points 1 day ago (2 children)

And I had no idea what the fourth derivative was called so I had to look it up. It’s called snap or jounce.

[–] [email protected] 3 points 1 day ago (1 children)

I remember when my calculus professor offhand mentioned these and jerk. He had a really dry sense of humor, so I didn't realize that he wasn't joking with us (the class) until like two semesters later.

[–] [email protected] 0 points 7 hours ago (1 children)

So, you didn't realise that during the unit test?

[–] [email protected] 1 points 2 hours ago

If I remember right, it wasn't on any test. Those tests were all problem solving, and none of the problems had derivatives deeper than acceleration. It was awhile ago though, I could be misremembering

[–] [email protected] 7 points 1 day ago

And fifth/sixth derivatives are crackle and pop because some physicists thought it would be funny to have it be “snap crackle and pop”