Act 1.1.1 Simple Machine Investigation – Lever
First Class Lever
Create a first class lever system utilizing various fischertechnik® building components and a
scientific mass. Apply the scientific mass (resistance force) to the lever and use a force
measuring device to determine the force needed to obtain static equilibrium.
1. Annotate the first class lever with distances (DE, DR)
and forces (FE, FR).
2. Calculate the ideal mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
3. Calculate the ideal effort force needed to overcome the known resistance force.
Formula
Substitute / Solve
Final Answer
4. Calculate the actual mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
5. Calculate the efficiency of the lever system.
Formula
Substitute / Solve
Final Answer
6. List and describe two examples of a first class lever.
POE – Activity 1.1.1 – Simple Machine Investigation – Lever – Page 1
Second Class Lever
Create a second class lever system utilizing various fischertechnik® building components
and a scientific mass. Apply the scientific mass (resistance force) to the lever and use a
force measuring device to determine the force needed to obtain static equilibrium.
1. Annotate the second class lever with distances (DE,
DR) and forces (FE, FR).
2. Calculate the ideal mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
3. Calculate the ideal effort force needed to overcome the known resistance force.
Formula
Substitute / Solve
Final Answer
4. Calculate the actual mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
5. Calculate the efficiency of the lever system.
Formula
Substitute / Solve
Final Answer
6. List and describe two examples of a second class lever.
POE – Activity 1.1.1 – Simple Machine Investigation – Lever – Page 2
Third Class Lever
Create a third class lever system utilizing various fischertechnik® building components and a
scientific mass. Apply the scientific mass (resistance force) to the lever and use a force
measuring device to determine the force needed to obtain static equilibrium.
7. Annotate the third class lever with distances (DE, DR)
and forces (FE, FR).
8. Calculate the ideal mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
9. Calculate the ideal effort force needed to overcome the known resistance force.
Formula
Substitute / Solve
Final Answer
10. Calculate the actual mechanical advantage of the lever system.
Formula
Substitute / Solve
Final Answer
11. Calculate the efficiency of the lever system.
Formula
Substitute / Solve
Final Answer
12. List and describe two examples of a third class lever.
POE – Activity 1.1.1 – Simple Machine Investigation – Lever – Page 3
13. Is it possible for a first or second class lever to have a mechanical advantage less than one,
or for a third class lever to have a mechanical advantage greater than one? Justify your
answer.
14. When you were solving for mechanical advantage, what units did the final answer require?
Explain why.
POE – Activity 1.1.1 – Simple Machine Investigation – Lever – Page 4