# Lever Principle: Virtual Lab

Instructions: At this simulation, you can move and add weights to a lever in an attempt to balance it at its fulcrum

### Simulation 1

For this part, always align your weights vertically (in a straight line downward) and determine how many it takes to balance on each side.Each weight = 1 N; Each box on the lever = .10 m

 Left Side (2 weights) Left Side Torque Right Side (1 weight) Right Side Torque .1 m .2 m .2 m .3 m .4 m .5 m

### Simulation 2

Investigate how you can spread weights out along the distance of the lever and balance the lever. You can use as many weights as you want and spread them out however you want, but you need to BALANCE the lever. On the chart below, input data for the balanced levers you constructed.

 BALANCED LEVER Left Side Right Side Number and Distance of Weights (Torque) Number and Distance of Weights (Torque) 1.0 N x .20m + 1.0N x .10 m = .3 Nm 1.0 N x .30 m = .3 Nm

### ANALYSIS:

1. What has to be equal for the lever to be balanced? ________________

2. What two variables are necessary to calculate torque? _________________ and _________________

3. Make a drawing of a lever that holds a 20 Newton weight on one side. How would you need to balance it on the other side with only a 10 newton weight? Your drawing must include distance labels.

M1 = 20 x distance 1

M2 = 10 x distance 2

M1 = M2 (for balance)

## EXTENSION: Design a CATAPULT

Instructions: In this simulation,you can adjust the variables of your catapult to accomplish 3 tasks involving height, distance and strength. For each test, show on the chart how you were able to accomplish it (what settings did you use). Just mark on the diagram the settings you chose.

 HEIGHT (settings that worked) DISTANCE (settings that worked) STRENGTH (settings that worked)