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Force in the early years/Document: Difference between revisions
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'''Points to follow up''' | '''Points to follow up''' | ||
''Pressure= force ÷ area'' | |||
If someone stands on your toes wearing stiletto heels, it is more painful than if they do so wearing wellies. The same force is applied over a smaller area. This also explains why it is important to lie on a ladder if you are rescuing someone trapped in a frozen pond. Your pressure on the ice will be less because your weight (force) will be spread over a larger area. | If someone stands on your toes wearing stiletto heels, it is more painful than if they do so wearing wellies. The same force is applied over a smaller area. This also explains why it is important to lie on a ladder if you are rescuing someone trapped in a frozen pond. Your pressure on the ice will be less because your weight (force) will be spread over a larger area. | ||
''Energy = force x distance'' | |||
The same energy is required to close a door however you do it. If you close it with your hand near the hinge, it is hard work. A large force is needed because the distance is small. If you close it with your hand near the handle it is much easier. Less force is needed because the distance is greater. | The same energy is required to close a door however you do it. If you close it with your hand near the hinge, it is hard work. A large force is needed because the distance is small. If you close it with your hand near the handle it is much easier. Less force is needed because the distance is greater. | ||
