Springs and Elastic Energy (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

attract
repel

Materials Needed

pencils
toy cars
ramps
string
weights
tape

Safety First

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

Steps

Step 1 — Read

Read about Forces and write down three key facts.

Step 2 — Do

Test friction: pull a weighted box across 4 surfaces (carpet, tile, sandpaper, foil). Use a spring scale to measure the force needed for each.

Step 3 — Observe

Draw a detailed diagram of what you observe.

Step 4 — Record

Write a conclusion: what did your results show? Did they match your prediction?

Check Your Understanding

Question 1

1 of 3

What does Newton's third law state?