Toys and forces -- How does a bouncing toy work? -- How do forces make bouncing toys work? -- What makes a bouncing toy start moving? -- What makes a bouncing toy change direction? -- What makes a bouncing toy speed up? -- What makes a bouncing toy slow down? -- What makes a bouncing toy stop? -- What else affects how a bouncing toy moves? -- Make a bouncing toy: jack-in-the-box -- Experiment: how high will it bounce? -- How forces make bouncing toys work.