Question

A lever with an input arm of 2 meters has a mechanical advantage of 4. What is the output arm's length?

Answer 1

Use the formula we used in your last question:
Advantage = Output/Input.
You know two of these variables and hence can calculate the third.

Answer 2

Here's a short discussion: "Law of the Lever"
http://en.wikipedia.org/wiki/Mechanical_advantage#Law_of_the_lever

Answer 3

@JamesJ
Yes, but how do you work it?
The mechanical advantage is already given to us. Dont you have to like cross multiply it?

Answer 4

Yes if
Advantage = Output/Input
and you know that Advantage = 4 and Input = 2, then what MUST Output be?

Answer 5

Advantage = Output/Input
hence
4 = Output/2

Thus Output = ....?

Answer 6

@JamesJ I still dont get it

Answer 7

Let x be the Output length. Then we have

4 = x/2

What MUST the value of x be?

Answer 8

@JamesJ 2?

Answer 9

2/2 = 1, so that's not right. And please stop tagging me.

Answer 10

okay I still dont get it

Answer 11

What number divided by 2 gives 4.

x/2 = 4.

What must x be?

Answer 12

6

Answer 13

8

Answer 14

Which one?

Answer 15

8

Answer 16

Yes

Answer 17

4 times 2 is 8

Answer 18

i knew it but i got confused b/c of cross multiplying

Answer 19

another one
How do you find the input arm?
MA = 6
Output arm = .8

Answer 20

Use EXACTLY the same formula as this problem.

MA = Output/Input

Now solve for Input

Answer 21

7.5?

Answer 22

If MA = Output/Input
then
Input = Output/MA
= 6 / 0.8
= 7.5

Yes

Answer 23

MA = .5
INPUT ARM = .4

Does OUTPUT ARM = .2?

Answer 24

MA = Output/Input

hence

Output = MA * Input
= 0.5 * 0.4
= 0.2

Answer 25

Ramp Problem.

A 5-meter ram lifts objects to a height of .75 meters. What is the mechanical advantage of the ramp?