1. What force should the wheals act on the inner

2. what motor is right to be used to pull the device and the chain, the device weight roughly 370 g without the motors. Thanks you

Attempt at solution

Total weight of chain and device is 0.2kg x 2.8m = 0.56kg

Adding the device weight of 370g to 560g we total to 0.93kg

Well with two motors on two wheels, I can calculate the force acting down on the device which is force= mass x gravity

F = 0.93kg x 9.81

F= 9.12 N

So there fore I need two motors producing more force than 9.12N to create an upward force, therefore

If I have a motor attached to a wheel of 9mm in diameter. And when I buy I motor I am given the angular velocity (w), and the torque (t)

So if torque = force x radius of wheel x sin90

And I have torque and radius then rearranging the equation to get force upwards is

Force = torque/ (radius x sin90)

So now I have force acting upwards and I can get a good enough motor to have a higher force acting upwards than downwards.

The motor I buy will have the info of the torque and angular velocity

So to get a tangent velocity on a position on a wheel

Tangent velocity = radius of circle x angular velocity

Having the tangent velocity in rad/sec can I work out the time it takes for the wheel to travel up to the top, and is there any thing a posing the velocity to decrease it if so how do can I calculate it and what is it. Thank you

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