Question

1. How can a simple fixed pulley make a job easier?A. By decreasing the force required to lift the object
B. By decreasing the work done
C. By changing the direction at which the force needs to be applied
D. By decreasing the distance that the force needs to be applied
3. A pulley system has a mechanical advantage of 3, and an object weighing 9 Newtons must be lifted 15 meters. How much force must be applied to lift the object?
Use the following equation to find the answer: MA=
F
in
​

F
out
​

​
A. 3 N
B. 27 N
C. 0.3 N
D. 1.7 N

Answer 1

1. A simple fixed pulley makes a job easier by:
**C. By changing the direction at which the force needs to be applied.**

While a pulley can help to lift an object by allowing you to pull down instead of lifting up, it does not decrease the force required to lift the object or the work done in lifting an object.

3. To calculate the force that must be applied to lift the object using the mechanical advantage (MA) formula (MA = F_in / F_out), we can rearrange this equation to find F_in:

\[ F_{in} = \frac{F_{out}}{MA} \]

Given:

- \( MA = 3 \)
- \( F_{out} = 9 \) N

Now, we substitute:

\[ F_{in} = \frac{9 \, \text{N}}{3} = 3 \, \text{N} \]

So, the answer is:
**A. 3 N**