Mechanical Advantage - Pulleys

This is a very well presented video. The use of live modeling and fixed graphics is effective. It has been presented with appeal to verbal/linguistic as well as visual/spatial. The use of the logical/mathematical test at mid point before further examination/repetition in appeal to the naturalistic (mower lifting) helps the learner gauge him/herself while providing ample opportunity to master the concept.

This is a very skilfully constructed video.

You're are awesome! Keep it up! Also, could you make a levers episode, that would help a lot with a test I've got coming up. Thanks.

DEAR FRIENDS,
In a situation with movable pulley, one end is attached to a hook on the top, which shares the weight with our hand, so that's why it shows less amount. it would work with any movable hood or loop as well!
Check it out!

Thank you so much for that.  I am in the Coast Guard and studying for my Aviation Selection Test Battery to hopefully get into flight school. This was the only section I really needed to brush up on and it sure did help!

i love this guy

i bet hes a science teacher

excellent.
greetings from france

Its very interesting fact that we can pull wait up using less energy but we calculate total energy used to pull wait up may be equal to the pull up wait without special arrange pulley so no save of energy whether we use big power for some time or less power for long time total power consume will be same. Is it or Not ?

yea..the total power remains the same......only thing is that we use small amount of energy for longer time than using higher amt of energy for shorter time......hope i'm right.. :)...?

The work done is the same. When you reduce the force you increase the length (Work = force x distance).

So the mechanical advantage of 2 for the movable pulley meant the distance he had pulled the string was 2 times as much as the distance the block had moved. So by doubling the distance he pulled he reduced the load by half.