Worksheet: Force and Pressure

In this worksheet, we will practice defining pressure as the force per unit area and calculating pressures acting on a surface.


Why are sharper knives more effective at cutting?

  • ASharper knives have smoother surfaces, allowing them to slide into the weak points of what is being cut.
  • BThe smaller contact surface of a sharper knife can react faster with the surface of what is being cut.
  • CThe sharper the knife, the greater the torque on the cutting surface.
  • DSharper knives have smaller contact areas, so, with the same force, this translates to a greater pressure.


Why should you roll or belly crawl rather than walk across a thinly frozen pond?

  • AThe more of your body rests on the ice, the less you weigh.
  • BIf you have more contact with the ice, the ice will warm up and expand, becoming more buoyant.
  • CThe greater your contact area with the ice, the lower the pressure and the risk of it breaking.
  • DActually, you should walk on tiptoe so that your body heat does not melt the ice.

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