Speedboats – Designing and Making Design Brief To design and make a toy speed boat that can be played with at bath time. Design Criteria It will need to: Float Be easy to use Go fast Look attractive Why do things float? They are pushed up by the water. This force is called ‘buoyancy’
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air resistance (drag)
up thrust (buoyancy)
Gravity (force of attraction)
holidays? racing? touring? fun? rescue? fishing?
pulleys and drive band
propeller & shaft