Rolling, Sliding, and Stopping (Part 2)

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

friction
inertia
force

Materials Needed

weights
tape
ruler
cardboard
marbles
paper clips

Safety First

Be careful with scissors — ask an adult for help if needed.

Steps

Step 1 — Read

Review the background information on Energy Transfer 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?