Gravity: The Force That Pulls (Part 3)

What You'll Learn

Gravity is the force that pulls objects toward each other. On Earth, gravity pulls everything toward the center of the planet, giving objects their weight.

Key Words

friction
inertia
momentum

Materials Needed

cardboard
marbles
paper clips
rubber bands

Safety First

Be careful with scissors — ask an adult for help if needed.
Do not look directly at the sun or bright lights.

Steps

Step 1 — Read

Review the background information on Energy before starting.

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

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What causes an object to accelerate?