The laws of motion and mass, as well as conservation and transfer of chemical, elastic and kinetic energy, are some of the physics concepts demonstrated with a toy slingshot. Use of the slingshot also demonstrates how variables affect these concepts.
As the operator draws back the slingshot, he uses his chemical energy and transfers it into elastic energy conserved inside the rubber bands. Releasing the rubber bands converts the stored elastic energy into kinetic energy, which generates the motion of the projectile.
Once the projectile is released, the laws of motion and mass come into play. The projectile reaches its maximum velocity right after its release. Wind, heat and the projectile's shape, size and mass affect its trajectory, speed and distance of travel. However, the amount of kinetic energy transferred to the projectile and the effect of gravity on its flight path are not affected by its mass.
Test energy variables by using rubber bands of different thickness and elasticity, or by having someone with greater or lesser strength operate the slingshot. More strength leads to more energy, which leads to the projectile hitting a target with greater force. Vary the mass, shape and type of the object used as the projectile to observe the laws of motion.