Explain Waves Cause Motion Practice Test

Diego places a small toy boat in a clear tray of water. Before he makes waves, the boat stays still. He taps the water on one side, and ripples travel to the boat. Each time a ripple reaches the boat, it rocks and changes position slightly. Which explains why the boat moves?

Marcus holds one end of a jump rope while Keisha holds the other end. A small ribbon is tied near Keisha’s end, and it hangs still at first. Marcus flicks his end to make a wave travel along the rope. When the wave reaches the ribbon, the ribbon bounces. Why does the ribbon move when the wave reaches it?