Teacher Background Information

This elaboration provides students with the opportunity to investigate the effect of different forces through First Nations Australians’ use of instructional devices, as toys and in games, to develop particular skills or to learn about a subject. Students will have the opportunity to investigate how First Nations Australians have long-held scientific understandings of the effect of the application of forces on the movement of objects and have used, and continue to use, these understandings in a variety of contexts.

For millennia Aboriginal and Torres Strait Islander Peoples have used instructive toys and games as educational devices and models to stimulate learning of young people. Children’s games and activities have long provided a context for acquiring knowledge, understanding and the development of skills required in later life. Many instructive games and toys involve objects that are moved through the application of both contact and non-contact forces. Several types of contact forces are evident in Aboriginal and Torres Strait Islander Peoples’ instructional toys and games, including applied force, frictional force and air-resistance. Applied force is force exerted directly on an object resulting in movement of the object, such as a throw, push or pull. Frictional force refers to the force between surfaces that are in contact, while air-resistance is the force in opposition to the relative motion of an object as it passes through the air. Non-contact forces include gravitational force, magnetic force and electrostatic force. The only non-contact force that affects the moving objects in Aboriginal and Torres Strait Islander Peoples’ instructional devices is gravitational force, the pull of objects towards the Earth’s centre.

Imitation implements often simplify, miniaturise or model objects used, or activities practised by adults. They teach or enhance skills required in adulthood. For example, smaller versions of implements such as boomerangs and spears are made for children to develop skill and accuracy in hunting techniques. A variety of Aboriginal and Torres Strait Islander Peoples’ games are designed to develop skills such as aim and coordination; spears and a target are manufactured to suit the child’s size and ability. The Pitjantjatjara Peoples of the central desert manufacture toy spears from the long stems of bushes and a circular bark disc. The players divide into two groups and applied (contact) force is exerted on the disc to roll it between the groups. As the disc passes, each group in turn tries to spear the moving target, and applied forces are exerted on the spear for its launch. Once launched the forces acting on the spear include contact forces, in the form of air-resistance, and non-contact forces, in the form of gravitational forces, causing the spear to fall. To challenge older children, the disc is carved in an irregular shape, causing it to wobble and roll less predictably and requiring greater skill to accurately hit the moving target.

Similarly, miniaturised boomerangs are made to engage and instruct children in the skill of boomerang throwing. A variety of games with boomerangs are played by both children and adults. The Jagara Peoples of the south-east Queensland region play a game of accuracy called buran that involves the players throwing boomerangs at a target. Similar to spear throwing, the contact and non-contact forces exerted on the boomerang include applied force to launch the boomerang and gravitational force that returns it to the ground or hand. The Jagara Peoples use different boomerangs according to the strength of the wind. Large boomerangs are used in high wind and smaller boomerangs used in light wind, likely due to the impact of air-resistance as a contact force affecting the game.

Australia’s First Nations Peoples played numerous ball games for amusement, often to teach or reinforce kinship or social relationships. In many ball games that Aboriginal and Torres Strait Islander Peoples have played for millennia, contact force is exerted on the ball by throwing or kicking. The amount and direction of the contact force applied to the ball determines the trajectory and distance the ball will travel.

The Wurundjeri Peoples of the Yarra Valley area in Victoria have long played the game of marn-grook (a Gunditjmara word that translates to game ball in English) using a ball made from possum fur. Many believe that the game marn-grook was the foundation of Australian Rules football that continues to be played today. The game begins with a player using non-contact gravitational force to drop the ball onto the foot. On contact with the foot, the player then kicks the ball, with the applied force determining the height and direction the ball travels. In western Victoria the best player is determined by who can kick the ball the highest, that is, the player who can exert the greatest contact force onto the ball. The Mabuiag Peoples of Mabuiag Island in the Torres Strait play a ball game called kokan, where the contact force applied to the ball is exerted with the use of a club or bat crafted from a bamboo stick. The game is played on the beach, where the contact force of friction from the sand impacts the speed of the ball.

Many instructional devices that are used by Aboriginal and Torres Strait Islander Peoples are set into motion through contact force applied by the person. For example, spinning tops made from materials such as the hard shell of a nut, beeswax, plaster or volcanic rock with a hole drilled through the centre and fastened to a stick with resin and twine, are set in motion by twisting between the thumb and forefinger or between the palms of the hands. On the Island of Mer in the Torres Strait the spinning stone tops of the Meriam Peoples are called kolaps. This game can create intense competition among the Meriam Peoples. The winner is the person whose spinning device stays in motion the longest. The applied force sets the spinning top in motion, and competitors prolong the time the object is in motion by sheltering the device from wind, thereby limiting the contact force of air-resistance that slows the device.

Other Aboriginal and Torres Strait Islander Peoples’ toys and games rely on the non-contact force of gravity. Propeller devices and objects that spin in the air fall to the ground due to gravitational force. The Jangga Peoples of the central Queensland region play a game called bindjhera using leaves from the Acacia tree folded into boomerang shapes. The leaves are set into motion using the contact force from the rising air current over a fire. Once the leaves are beyond the contact force of the air current, gravitational force causes them to spin and spiral back to the ground. The Biyaygiri and Djiru Peoples of the north Queensland coastal region construct propeller and aeroplane devices from the leaves of the Pandanus palm. A piar-piar, is carefully constructed by folding and interlocking strips of pandanus leaf. It whirls in the air, set in motion by applied contact force causing it to spin, or by non-contact gravitational force, where, on release it spirals to the ground.

This elaboration provides students with the opportunity to investigate the effect of contact and non-contact forces through Aboriginal and Torres Strait Islander Peoples’ use of instructional devices as toys and in games to develop particular skills or to learn about a subject. Aboriginal and Torres Strait Islander Peoples have long-held scientific knowledge of the effect of the application of force. Contact forces, including applied force, air-resistance and frictional force, and the non-contact force of gravity are used to cause the movement of educational objects used as toys and games by Aboriginal and Torres Strait Islander Peoples.