We use a Hero's engine model to show how equal and opposite forces can cause propulsion. Two holes are pierced in a metal bottle and some water is added. This is suspended above a Bunsen burner, and as the water boils and leaves the...

We use eggs to show how different rates of deceleration affect the outcome of collisions. One egg is dropped onto a hard surface and breaks. The second egg is dropped onto a soft surface and bounces, as the material slows its...

Meet the robots who use statistics to learn about the world around them. Maths - Statistics And Probability A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in...

Discover how speed, velocity and acceleration are interlinked but very different measurements of motion. Physics - Forces - Learning Points. The velocity and acceleration of any moving object can be calculated. Speed is the distance...

Newton's development of calculus, and how this changed the way we describe the world. Maths - History Of Maths A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in...

How the orbit of the planets is dictated by mass and the force of gravity. Physics - Our Solar System - Learning Points. The curved path of one object around another is its orbit. Objects orbit due to the effects of gravity. The...

Born out of research into RADAR in World War Two, ultrasound has become one of the most important medical inventions. What is it, and how does it work? Biology - Being Human - Learning Points. Ultrasound was developed by Ian Donald in...

There are only six basic types of machine. Discover more about planes, wedges and screws: what are they and why are they useful? Physics - Forces - Learning Points. Machines based on the ideas of Archimedes make work easier. An inclined...

The force of gravity acting on a mass, measured in newtons. On Earth, gravity exerts a force of just under 10 newtons per kilogram. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...

The process of pushing or moving an object forwards. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract...

In physics, an observer is a person or system that records some observable property of a system, such as the velocity of an object. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...

The upward force exerted on an object by the fluid which surrounds it. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...

Sounds travel in waves.
<

br/>

The world around us - Light and


sound - Sound />

Learning Points
Sounds are made by


tiny movements called vibration
s

.


Sound energy travels in...

Did you know that speed is the rate of motion?
<

br/>

Physical processes - Force and motion - Red
u

cing friction />

Learning Points /

> Force causes an object to move.


The size of...

True or false ... Unbalanced forces cause an object to change speed?
<

br/>

Physical processes -Force and motion - Actio
n

and reaction />

Learning Points
Unbalanced forc
e

s cause an object to change...

See how the density of an object is calculated and why some materials are buoyant.
<

br/>

Material processes - Classifying materials - Propertie
s

of materials />

Learning Points
Density i
s

the...

Learn that shadows change size as the angle of a light source changes.
<

br/>

Physical processes -L
i

ght - Shadows />

Learning Points
The length of a shadow can change
w

ith the angle of the light...

Four examples of actions that change the shape of objects are shown, but which is the odd one out?
<

br/>

Physical processes - Force and motion -
W

hat is force?


A Twig Tidbit Film - Odd one out. The...

Did you know that force is measured in newtons?
<

br/>

Physical processes - Force and motion -
W

hat is force? />

Learning Points r

/> Forces are measured in newtons.


A Twig Tidbit Film -...

What is the difference between mass and weight?
<

br/>

Physical processes -Force and mo
t

ion - Gravity />

Learning Points
Mass is the amount of stuff in an object, it i
s

measured in grams and...

Without this force, it would be a very slippery world!
<

br/>

Physical processes -Force and mot
i

on - Friction />

Learning Points
Friction is the force betw
e

en two surfaces rubbing together....

Find out how shadows are formed and what types of materials produce shadows.
<

br/>

Physical processes - L
i

ght - Shadows />

Learning Points
Shadows are created when
a

n object blocks the...

Opposing forces are at work all the time, even when you aren't moving!
<

br/>

Physical processes -Force and motion - Actio
n

and reaction />

Learning Points
When opposing forces are balan
c

ed,...

This program illustrates ways students can make observations and measurements to identify materials based on their properties. Specific attention is given to properties such as color, texture, hardness, and flexibility. The program...