1. Mechanical Advantage

2. What does it mean to be in rotational equilibrium?
All torques are balanced
The lever is not rotating

3. If in rotational equilibrium:

4. Mechanical Advantage
A measure of how much easier the machine makes a task
Ratio of output force to input force
Known as force amplification

5. Ideal Mechanical Advantage (IMA)
The mechanical advantage the machine will provide if all conditions are perfect
No friction, no wear, all forces applied in the proper directions

6. Actual Mechanical Advantage (AMA)
The mechanical advantage the machine provides when used
Forces are measured

7. If the force is transmitted perfectly (100% efficient)
If the force is not transmitted perfectly

8. Copy Table 1 from Pg 88 in text

9. IMA - Pulley
IMA of a pulley is based on the number of strands supporting the mass

10. How effective a machine is at transforming an input into an output
% Efficiency
How effective a machine is at transforming an input into an output

11. Example 1: The following pulley system carries a mass of 30.0kg.
Calculate:
Actual Mechanical Advantage
Ideal Mechanical Advantage
% Efficiency
FE= 100N

13. Example 2:
A pulley system has a 20.0kg load attached to it. The load arm is 50.0cm, the effort arm is 200cm and the effort force is 60N.
Calculate: FL
AMA
IMA
% Efficiency

14. Example 2:
In the attached picture,