Renewable Energy Sources (Part 3)

What You'll Learn

A lever is a rigid bar that rotates around a fixed point called a fulcrum. Seesaws, scissors, and bottle openers are all examples of levers that multiply force.

Key Words

power
simple machine
lever

Steps

Step 1 — Read

Study the diagram and label the parts you recognize.

Step 2 — Do

Construct a catapult from popsicle sticks and rubber bands. Launch a marshmallow from different angles and measure the distance. Find the angle that gives the longest launch.

Step 3 — Observe

Compare the before and after states.

Step 4 — Record

Write your conclusion: did the results match your hypothesis? What would you change next time?

Check Your Understanding

Question 1

1 of 3

Which is a renewable energy source?