P2 Pressure Flashcards

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1
Q

How can we calculate area using the pressure equation?

A

Area = Force ÷ Pressure

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2
Q

How do we calculate pressure?

A

Pressure = Force ÷ Area

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3
Q

What are the units of pressure?

A

Newton per metres squared (N/m2)

or

Newtons per centimetres squared (N/cm2)

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4
Q

If your decrease the area that a force is acting over you will ______ the pressure.

A

If your decrease the area that a force is acting over you will increase the pressure.

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5
Q

Define pressure.

A

When a force acts over an area.

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6
Q

When you stand on a surface you exert a ______ on the surface.

A

pressure

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7
Q

How can we calculate force using the pressure equation?

A

Force = Pressure x Area

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8
Q

If you increase the area that a force is acting over you will ______ the pressure.

A

If your increase the area that a force is acting over you will decrease the pressure.

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9
Q

What is the force that is acting on the ground where you stand?

A

Your weight

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10
Q

State the right equation and calculate the force required to exert a pressure of 100N/m2 over an area of 2m2.

A

force = pressure x area

100 x 2 =

200N

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11
Q

Calculate the pressure if 20N of force is spread over 5cm2 . Give the units.

A

P = F/A

20/5 = 4 N/cm2

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12
Q

If a force of 50N exerts a pressure of 10 N/cm2 - what is the area? Give the units.

A

A = F/P

50 / 10 = 5 cm2

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13
Q

What force is needed to exert a pressure of 500 N/m2 over an area of 5 m2? Give the units.

A

F = P x A

500 x 5 = 2500 N

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14
Q

How many cm2 are there in 1 m2?

A

100 x 100 = 10,000 cm2

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15
Q

Why does sharpening a knife make it safer to use (describe using pressure, force and area)

A

A sharp blade a smaller area

This means it can create the same amount of pressure with a smaller force

Using a smaller force is safer

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