Speedboats – Designing and Making

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# Speedboats – Designing and Making - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Speedboats – Designing and Making' - Samuel

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Presentation Transcript
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’
• As an object is placed in water, it pushes the water aside to make room for itself. This is called “displacement”
• To float, an object has to push aside an amount of water that is equal to its own weight
• Shape is important – it is more likely to float if it has a large surface area. So a clay ball will sink. But the same amount of clay shaped into a bowl will float.

switches

Easy to use
• What do we need to think about?
• What type of switch and where will it be positioned?
• Can you change the batteries easily?
• What if your rubber band comes off the pulley? Can you replace it easily?
• Anything else?
Going fast
• What forces will affect your speed boat?
• Will they speed it up or slow it down?

thrust

air resistance (drag)

water resistance

up thrust (buoyancy)

Gravity (force of attraction)

Looking attractive
• What do you like or dislike about these boats?
Looking attractive
• In what way are these boats alike?
• In what way are they different?
Looking attractive
• What do you think these boats are used for?

holidays? racing? touring? fun? rescue? fishing?

cabin

pulleys and drive band

stern tube

switch

bow

propeller & shaft

batteries

keel

stern

rudder

motor

hull

• What materials will you use?
• Where will you place your electric circuit?
• Does it meet your design criteria?