Answer:
Step-by-step explanation:
friend, imagine a seesaw of length 2 meters. Now place a kid weighing 800N (almost 82 Kg) on one end of the seesaw. To lift that kid up, you have to put some weight on your side of the seesaw. Now you are told that the distance from the pivot to your end of seesaw is 160 cm.
This means that the seesaw is not perfectly balanced but more of it is on your side or the pivot is far from you.
now substract 160cm from 2m and you get the distance between the kid and the seesaw which is 40cm.
Now let me introduce you to "Moment", it is a number which helps us calculate the missing value in this problem.
Moment = Force x Distance from the pivot
The moment of the fat kid ;
800N x 40cm = 32000
To lift that kid you have to get the same moment as his. ie (32000)
Now you know your distance from the pivot which is 160cm.
Moment = Force x Distance from the pivot
so substitute Moment for 32000 and the distance for 160 cm and assign a variable to the force.
32000 = F x 160cm
32000/160 = F
200 = F
The force required is 200N.
You have found out the force you need or the weight you need to lift that kid.