- #1
johnpauldisec
- 13
- 0
Acceleration is not Force/mass, mechanical advantage (?)
I have a vehicle with wheels and electric motor that drives that wheels.
Those are characteristics of engine
Resultant torque and velocity at wheel will depend on radius of that wheel, as wheel work as gearing.
Let's say i will try with wheel A of 1m radius and wheel B of 2m radius.
On same engine speed vehicle with wheel A will have bigger torque&force at wheel but with lower wheel velocity, opposite will be on wheel B.
But the acceleration force will be same, as it depends on power from engine.
This guy called Newton said that acceleration is force/mass. But he is liar as its not possible.
Because in my example on wheel A force is two times bigger than in Wheel B, but both vehicles have same acceleration at same engine revs.
Also look here:
this picture is from https://en.wikipedia.org/wiki/Mechanical_advantage article
On Both bikes same force and power is applied on pedal,
the difference is gearing of the bikes. Bike on the left is making twice force/torque bike on right but on two times shorter distance which means two times smaller wheel speed.
Both bicycles encounter same acceleration. If i was using Newton's incorrect calculating of acceleration bike on left would have bigger acceleration. Also, i could have infinite acceleration with proper gearing...
How to calculate real acceleration? I can't just multiple force with distance or wheel velocity. What when the bike is stopped and i start to apply force on pedal? the wheel's speed and distance is 0 so would be the acceleration
I know now that wheel and gearing are machines that use Mechanical Advantage
And wheel size and gearing is just converting between more/less torque and more/less velocity of wheel (distance)
The power is the same, and actually acceleration is same too
but how to calculate acceleration if i know engine torque, revs, gearing, wheel diameter, wheel velocity
take in mind that the wheel velocity can be 0 (when vehicle is stopped)
also, engine can also be stopped as its electrical dc engine that is able to produce torque at 0 rpm
look at this too:
those are torques on wheel and rpm on wheels on different gears
we all know that its the power that actually accelerates vehicle
but stupid Newton tells me that its the force/torque
if he was right i could use such gearing that would make 1000000 torque on wheel from engine that generates 1 Watt and i would have unreal acceleration
as i told, can't just multiply torque with distance/velocity as vehicle and engine can be stopped
I have a vehicle with wheels and electric motor that drives that wheels.
Those are characteristics of engine
Resultant torque and velocity at wheel will depend on radius of that wheel, as wheel work as gearing.
Let's say i will try with wheel A of 1m radius and wheel B of 2m radius.
On same engine speed vehicle with wheel A will have bigger torque&force at wheel but with lower wheel velocity, opposite will be on wheel B.
But the acceleration force will be same, as it depends on power from engine.
This guy called Newton said that acceleration is force/mass. But he is liar as its not possible.
Because in my example on wheel A force is two times bigger than in Wheel B, but both vehicles have same acceleration at same engine revs.
Also look here:
this picture is from https://en.wikipedia.org/wiki/Mechanical_advantage article
On Both bikes same force and power is applied on pedal,
the difference is gearing of the bikes. Bike on the left is making twice force/torque bike on right but on two times shorter distance which means two times smaller wheel speed.
Both bicycles encounter same acceleration. If i was using Newton's incorrect calculating of acceleration bike on left would have bigger acceleration. Also, i could have infinite acceleration with proper gearing...
How to calculate real acceleration? I can't just multiple force with distance or wheel velocity. What when the bike is stopped and i start to apply force on pedal? the wheel's speed and distance is 0 so would be the acceleration
I know now that wheel and gearing are machines that use Mechanical Advantage
And wheel size and gearing is just converting between more/less torque and more/less velocity of wheel (distance)
The power is the same, and actually acceleration is same too
but how to calculate acceleration if i know engine torque, revs, gearing, wheel diameter, wheel velocity
take in mind that the wheel velocity can be 0 (when vehicle is stopped)
also, engine can also be stopped as its electrical dc engine that is able to produce torque at 0 rpm
look at this too:
those are torques on wheel and rpm on wheels on different gears
we all know that its the power that actually accelerates vehicle
but stupid Newton tells me that its the force/torque
if he was right i could use such gearing that would make 1000000 torque on wheel from engine that generates 1 Watt and i would have unreal acceleration
as i told, can't just multiply torque with distance/velocity as vehicle and engine can be stopped
Last edited: