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Camels have big feet so they have a large area and the pressure is small. This means they don't sink into soft sand.
Pressure 02
Revise what you know about the equation for working out pressure. What is a Fat Bike?
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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 mm2
4 cm2
4 m2
4 km2
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 cm2
0.1 m2
10 m2
40 m2
Area = force/pressure = 20/2 = 10 m2
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 m2
0.24 m2
1.2 m2
4.2 m2
Area = 600/2,500 = 0.24 m2
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 m2
0.24 m2
0.48 m2
1.2 m2
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 cm2
0.005 m2
0.01 m2
0.02 m2
Area = 500/25,000 = 0.02 (two feet), one foot = 0.01 m2
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 m2
1 m2
2 m2
3 m2
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 m2
0.24 m2
0.25 m2
4 m2
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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