Lower Secondary: Pressure (Revision)

Which is the correct unit of pressure?

• N

• J

• m

• N/m²

Look at the pressure triangle. How do we calculate the area?

• $f\div p$

• $f\times p$

• $p\times f$

• $f\div p$

What pressure does a 4000N horse exert on the ground if each foot is 10cm²?

• 40 N/cm²
• 100 N/cm²
• 400 N/cm²
• 10 N/cm²

Mr Wang weights 760 N, each of his foot has the area of 0.25 m². Calculate the pressure he exerts on the floor while standing on two feet.

pressure=______ N/m²

Which of the following will cause the pressure to INCREASE?

• Increase the force and decrease the area

• Increase the force and the area

When you go deeper under water, the water pressure on your body

• increases

• decreases

• stays the same

Check all action(s) that require pressure to work.

• Cutting a cake

• Bursting a balloon with a needle

• Wearing a pair of snow shoes

• Rubbing your hands together to create heat

Explain why do we experience greater pressure when we go deeper into the sea?

As we rise higher into the air, we experience lesser pressure. This is due to lesser air molecules above us.

• True

• False

A pressure of 300 N/m² is required to cut the cake, if Mr Wang applies 3 N of force using a knife.

Calculate the area in contact.

Area=________ m²