1 .

A box weighs 100 N. It exerts a pressure of 25 Pa on a table. What is the area of the box in contact with the table?

4 mm^{2}

4 cm^{2}

4 m^{2}

4 km^{2}

Area = force/pressure = 100/25. Remember weight is a force

2 .

A box weighs 20 N. It exerts a pressure of 2 Pa on a table. What is the area of the box in contact with the table?

10 cm^{2}

0.1 m^{2}

10 m^{2}

40 m^{2}

Area = force/pressure = 20/2 = 10 m^{2}

3 .

A skier weighs 600 N and exerts a pressure of 2,500 Pa on the snow. What is the area of the skis?

0.12 m^{2}

0.24 m^{2}

1.2 m^{2}

4.2 m^{2}

Area = 600/2,500 = 0.24 m^{2}

4 .

A skier weighs 600 N, lifts one ski up and exerts a pressure of 5,000 Pa on the snow. What is the area of one of the skis?

0.12 m^{2}

0.24 m^{2}

0.48 m^{2}

1.2 m^{2}

Area = 600/5,000

5 .

A student weighs 500 N, standing on two feet she exerts a pressure of 25,000 Pa on the ground. What is the area of one foot?

50 cm^{2}

0.005 m^{2}

0.01 m^{2}

0.02 m^{2}

Area = 500/25,000 = 0.02 (two feet), one foot = 0.01 m^{2}

6 .

One box weighing 60 N is put on top of one weighing 120 N. The pressure they exert is 180 Pa. What is the area touching the ground?

0.67 m^{2}

1 m^{2}

2 m^{2}

3 m^{2}

Area = (60 + 120)/180

7 .

A 60,000N elephant can stand on one foot! The pressure it exerts is 240,000 Pa. What is the area of its foot?

0.16 m^{2}

0.24 m^{2}

0.25 m^{2}

4 m^{2}

Area = 60,000/240,000

8 .

Camels have big feet so they don't sink into soft sand because .......

they have a large area so the pressure is large

they have a large area so the pressure is small

they have a small area so the pressure is large

they have a small area so the pressure is small

Spreading their weight out over as large an area as possible means they can walk more easily over soft sand

9 .

A sharp knife cuts well because .......

it has a large area so pressure is large

it has a large area so pressure is small

it has a small area so pressure is large

it has a small area so pressure is small

A sharp blade is sharp because it has been ground to a thin edge with a very small area

10 .

Doubling the force and doubling the pressure mean .......

that area doubles

that area gets larger

that area gets smaller

that area stays the same

Area = force/pressure so if you double both force and the pressure, the area over which the force is applied will remain the same

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