Video and lesson investigations on the topic of force and design. Key concepts include:
- Cars need to be strong enough to protect the occupants.
- Full-scale tests are important in testing the design and materials of cars for strength.
- Strong structures can withstand big forces.
- Brittle materials shatter,
- Non-brittle materials bend.
- In recent years, car body designs have been improved to provide better protection for occupants. For example, car bumpers have changed considerably. In older cars these were usually made of steel and were very solid. This may have protected the car but could be very damaging to anything the car hit.
- Modern bumpers are made of plastic and can withstand small forces without damage because they are flexible and can absorb some of the opposing forces. Some cars are designed to collapse in a special way when hit and are less likely to crush the occupants.