Rolling, Sliding, and Stopping

What You'll Learn

A force is a push or pull that can change an object's motion, shape, or direction. Forces are measured in Newtons and can act through contact or at a distance.

Key Words

wedge
magnet
attract

Materials Needed

string
weights
tape
ruler
cardboard

Safety First

Do not look directly at the sun or bright lights.
Clean up spills immediately to prevent slipping.
Use materials only as directed in the experiment.

Steps

Step 1 — Read

Review the background information on Magnets before starting.

Step 2 — Do

Test Newton's Third Law: blow up a balloon, attach it to a straw on a string, and release. Measure how far it travels with different amounts of air.

Step 3 — Observe

Use your senses (except taste) to describe what you notice.

Step 4 — Record

Write a summary of your findings in 3-5 sentences.

Check Your Understanding

Question 1

1 of 3

What is the formula for Newton's second law?