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engineer


a person who plans, builds, and tests new designs to solve problems

Bill King is an engineer who built a motorcycle that could ride on water.

  engineer

prototypes


early models of a machine

NASA tests prototypes of vehicles on Earth before sending them to space.

  prototypes

drag


a force that opposes the motion of an object moving through water or air

Choppy water causes drag that makes a boat slow down.

  drag

buoyancy


the ability to float in a liquid or air

The buoyancy of a boat can be affected by its shape and weight.

  buoyancy
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