Balanced and Unbalanced Forces

What You'll Learn

Balanced forces are equal in size and opposite in direction, so an object stays still or moves at constant speed. Unbalanced forces cause an object to accelerate or change direction.

Key Words

potential
work
power

Materials Needed

ramps
string
weights
tape

Safety First

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

Steps

Step 1 — Read

Read and learn: Balanced forces are equal in size and opposite in direction, so an object stays still or moves at constant speed. Unbalanced forces cause an object to accelerate or change direction.

Step 2 — Do

Follow the procedure carefully, step by step.

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 do balanced forces result in?