physics chapter 7

Question 1

what is pressure

Answer 1

pressure can be defined as force per unit area

Question 2

how can we calculate the pressure

Answer 2

pressure = force / area

Question 3

what are the common units used for pressure

Answer 3

newton per square metre ( N/ m^2)
newton per square centimetre ( N/ cm^2)

Question 4

how does the depth and density affect the pressure in a liquid

Answer 4

pressure in a liquid increases with depth and density

Question 5

how do we calculate the liquid pressure

Answer 5

change in pressure = density of liquid x gravitational field strength x change in depth

Question 6

the change in pressure is also known as

Answer 6

pascal (Pa)

Question 7

what does pressure depend on

Answer 7

area and force

Question 8

give me an example of how pressure varies with area

Answer 8

a tractor has wide tyres. the large surface area of the tyres reduces the pressure exerted on the ground. this prevents the tractor from sinking in a muddy field

Question 9

give me an example of how pressure varies with force.

Answer 9

there are two baskets, one filled with fruits and one that is empty. the basket filled with fruits will have a greater pressure on the fingers. the heavier load exerts a greater force on the same contact area.

Question 10

what are the factors that affect the pressure of liquid

Answer 10

• The pressure beneath the surface of a liquid will increase with the depth of the liquid
• In a column of water, the highest pressure would be at the bottom

Question 11

how does the pressure beneath the surface of a liquid increase with the depths of the liquid

Answer 11

This is because the pressure in a liquid is caused by the force of the weight of the liquid above it. As the depth increases, there is increasingly more liquid above which causes the pressure to increase

Question 12

how does the column of water, the highest pressure at the bottom affect the pressure of the liquid

Answer 12

If a hole is made at the bottom of the column, the water will pour out with a large force. If a hole was made at the top of the column, the water will pour out with a small force. This is because of the difference in pressure in the column caused by the weight of the water

Question 13

how does the pressure acting on an object in a liquid change with the depth

Answer 13

The deeper the object, the higher the pressure exerted upon it and vice versa