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Home » Science Experiments for Kids » Easy Painting Pendulum

Easy Painting Pendulum

Published: Aug 4, 2022 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

What is a pendulum?

A pendulum is an object hanging from a fixed point that swings backwards and forwards when pulled back and released. Imagine sitting on a swing in a park. If someone pulled the swing back and let go the swing would move backwards and forwards and eventually stop without another force to keep it moving. The movement slows because of friction acting between the air and the swing.

Energy transfer and a pendulum

As a pendulum swings gravitational potential energy is transferred into kinetic energy and then back to gravitational potential energy.A pendulum is a great way to demonstrate how energy is transferred.

Pendulum energy diagram showing how gravitational potential energy is converted to kinetic energy and back.

The swinging movement of a pendulum is due to gravity and the back and forth movements are called oscillations.

What is the period of a pendulum?

A period is the time it takes for a pendulum to swing back into the position it started from. The period of a pendulum increases with pendulum length.

This simple pendulum painting activity is a great way to demonstrate how a pendulum moves.

Pendulum Painting

You’ll need

3 wooden garden sticks

Small paper cup

Scissors

String

Paint

Pen

Small container for paint

Water

pendulum painting - image of a frame made from wooden skewers with a small paper cup suspended from the centre.

When you pull back and release the cup it swings like a pendulum. Paint falls from the cup as it moves showing the path of movement.

Instructions

Tie the top of the three sticks together to make a tripod shape.

Check the frame is secure.

Carefully use a pen to make a small hole in the bottom of the paper cup. This is to allow the paint to drip through.

Make two more holes in the cup, one on either side at the top. Thread a long piece of string through the holes and tie like the photo below. The cup needs to be hanging from a single point. Attach the other end of the string to the centre point of the tripod.

Check the cup swings like a pendulum.

pendulum painting cup

The paint needs to be quite thin to fall easily from the cup. Mix one tablespoon of paint with 2 tablespoons of water and stir well.

Pour a little paint into the cup and let the pendulum swing.

pendulum painting set up

pendulum painting

Extra challenge

Try swinging with more and less force and observe how the pendulum path changes.

Experiment with a longer and shorter string.

Examples of pendulums

A swing

Grandfather clock

Newton’s cradle

Foucault’s Pendulum

Science Concepts

  • Energy
  • Gravity
  • Motion

Last Updated on August 6, 2022 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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