# Weightlifter

## The Basics of Weightlifting

- Which forces help a weightlifter lift the weights?
- Which force makes the weights come back down?
- What's a pulley, and what's a block and tackle? How can these help a weightlifter train?

## Build the Weightlifter

- Building instructions book “B,” pages 68 - 86

## Can you lift it?

**Experiment 1:**

- Test to see if the model can raise the weights.
- What did you notice?
- Record your observations on your worksheet.
- Remove one wheel at a time from the barbell and test to see if the weightlifter can lift it.
- How many do you have to remove before the barbell can be lifted?

## Yes, you can!

**Experiment 2:**

- Change the model to pulley position 2 and test it again.
- What was different?
- Record your observations on your worksheet.
- How much can the weightlifter lift? Add bricks from the set to find out.

## What did you see?

- Which forces did you observe?