In Investigation One, you will investigate pulley systems and forces. During this Investigation, you will:

• Measure the force of gravity of each load force.
• Use a one-pulley system to measure the force in Newtons (N) to lift a load.
• Calculate the mechanical advantage of each load by using the pulley system by using the following formula:

• Use a two-pulley system and measure the force in Newtons (N) to lift a load.

In Investigation Two, you will explore first- and second-class levers and forces. During this Investigation, you will:

• Investigate how changing the position of the load on a first-class lever affects the effort force required to lift it.
• Calculated the load force by using the following formula:

• Construct a first-class lever.

In Investigation Three, you will explore third-class levers and forces. During this Investigation, you will:

• Calculate the load force of a 100-gram weight using the following formula:

• Construct a third-class lever.
• Determine the mechanical advantage using force and distance for different positions of the fulcrum on third-class levers.

This Performance Assessment is designed to allow students to solve a problem using the:

• concepts with which they have become familiar during the previous three Investigations, and
• procedures used during the previous three Investigations.