Recent content by DimosNat

You are right, i thought to help him with this one and let him practise with same type of excersices after.

The way i would solve it is the following: You can consider a point A ,which is where the roller touches the step, as your rotation axis and you can assume that positive torque is counter-clockwise. So now you have to ask to ΣΤ>=0 (T=torque) and you will find the lowest value of F so as the...

Namely, in the second case F will produce more work in comparison with the first case ,because the pencil in the same amount of time t will advance the same distance d and will rotate θ rad. So W1=E1=F*d while W2=E2=F*d + F*(x/2)*θ W1<W2 Is that right?

Homework Statement [/B] So here is the problem: We have a pencil , horizontally towards us, sitting on a table(see the picture). There are no external forces applying on the system table-pencil and friction of air doesn't exist. There is also no friction between the pencil and the table. So...