Mechanical Advantage

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

If in rotational equilibrium:

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

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

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

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

Copy Table 1 from Pg 88 in text

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

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

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

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

Example 2: In the attached picture,