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8.2 EFFECT OF FORCE (PRESSURE)

8.2 EFFECT OF FORCE (PRESSURE)

Assessment

Presentation

Science

2nd Grade

Hard

Created by

KASMAWATI Moe

Used 3+ times

FREE Resource

28 Slides • 23 Questions

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8.2 EFFECT OF FORCE (PRESSURE)

by KASMAWATI Moe

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​Watch this video (4 mins)

​Make sure to understand:

  • ​Definition of Pressure

  • Formula of Pressure​

  • Unit of Pressure

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Pressure

The effect of thrust on a surface depends also upon the area on which thrust acts.

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Pressure is defined as force acting per unit area.

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Pressure is inversely proportional to the area on which the force acts.

More is the area on which force acts less is the Pressure and vice versa

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NOW THINK

WHY HEAVY VEHICLES LIKE TRUCK HAVE 8 TO 10 TYRES?

WHY A SHARP KNIFE IS BETTER THAN A BLUNT ONE?

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Pressure equation

  • Pressure is described as force applied per unit area.

  • Pressure is measured in Pascals (Pa).

  • Area is measured in m2.

  • Force is measured in Newtons (N).

  • If a force of 100 N is applied to an area of 10m2, the pressure would be equal to = 100 / 10.

  • Pressure = 10 Pa.

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Air Pressure

High vs Low

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Read this slide twice: Make sure you understand what you are reading

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Read this slide twice: make sure you understand what you are reading

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Multiple Choice

Which type of air mass has a higher pressure?

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Humid and warm

2

cold and dry

3

humid and cold

4

warm and dry

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Multiple Choice

Which type of air mass has low pressure?

1

cold and dry

2

warm and humid

3

cold and humid

4

warm and dry

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Multiple Choice

What is pressure?

1

The amount of force exerted on a surface

2

The surface area of an object

3

The weight of an object

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Multiple Choice

What is the equation used to calculate pressure?
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pressure= force/mass
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pressure =mass/volume
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pressure=area/force
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pressure=force/area

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Multiple Choice

Pressure is measured in what units
1
Newtons
2
m/s
3
Pascals
4
Moles

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Multiple Choice

The pressure resulting from a force of 50 N exerted over an area of 5 m2 is
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10 N
2
0.1 N
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10 N/m²

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0.1 Pa

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Multiple Choice

Question image

What pressure will be exerted by a 10 N box that has equal sides of 2 m?

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5 Pa

2

2.5 Pa

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1.25 Pa

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0.2 Pa

5

0.4 Pa

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Multiple Choice

Question image
Which of the statements is true?
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The bottom of the boot exerts more pressure than the shoe as a result of an increase in surface area.
2
The bottom of the shoe exerts more pressure than the boot as a result of an decrease in surface area.
3
The bottom of the shoe exerts the same pressure as the bottom of the boot.

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Multiple Choice

Question image
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
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40 N/cm2
2
100 N/cm2
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400 N/cm2
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10 N/cm2

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Multiple Choice

Question image

Army tank tracks are useful for travelling through the mud because..

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they decrease the force the vehicle exerts on the ground

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they increase the force the vehicle exerts on the ground

3

they decrease the pressure the vehicle exerts on the ground

4

they increase the pressure the vehicle exerts on the ground

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Multiple Choice

When a diver dives deeper into the ocean, he will experience ...................... liquid pressure

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greater

2

less

3

no

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Multiple Choice

An object will ______ if its' density is greater than the density of the fluid it is in. 
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Expand
2
Shrink
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Float
4
Sink

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Multiple Choice

Air pressure is greatest when near Earth's surface because?
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The air molecules are farther apart.
2
The air molecules are closer together.
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Air molecules collide.
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Air molecules are tightly packed.

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Multiple Choice

As you climb up a mountain what happens to the air pressure?

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decreases

2

increases

3

stays the same

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Multiple Choice

In what direction(s) does air exert pressure?

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everywhere

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no where

3

there is no pressure

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downward

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Multiple Choice

Where would you find the largest pressure?
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At the bottom of the ocean
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At the top of Mt Everest
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Close to ground on the Scotch oval
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In a rockpool on the Great Barrier Reef

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Multiple Choice

Pressure rxerted by air on the earth's surface

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Pressure

2

Atmospheric pressure

3

Heat pressure

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Multiple Choice

What is true about the volume of displaced fluid for an object that is completely submerged?

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The volume of displaced fluid is equal to the object’s volume.

2

The volume of displaced fluid is less than the object’s volume.

3

The volume of displaced fluid is greater than the object’s volume.

4

The volume of displaced fluid is not related to the object’s volume.

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Multiple Choice

An object will _______ if the weight of it is equal to the weight of the water in which it is in. 
1
Float
2
Sink
3
Expand
4
Shrink

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Multiple Choice

A person wearing steel toe capped boots and a person wearing stilleto heels stand on a wooden floor. They both have the same weight. Which person exerts a greater pressure on the floor?

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The person wearing the boots because the boots have a larger surface area in contact with the floor

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The person with the stiletto heels because they have a larger surface area in contact with the floor

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The person wearing the boots because the boots have a smaller surface area in contact with the floor

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The person with the stiletto heels because they have a smaller surface area in contact with the floor

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Multiple Choice

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

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f ÷ a

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f x p

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p x f

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f ÷ p

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Multiple Choice

Which of these animals would probably cause the greatest pressure on the ground?
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A fat cow with big feet
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A fat cow with small feet
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 A calf with big feet
4
A calf with small feet

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Multiple Choice

Army tank tracks are useful for travelling through the mud because..

1

they decrease the force the vehicle exerts on the ground

2

they increase the force the vehicle exerts on the ground

3

they decrease the pressure the vehicle exerts on the ground

4

they increase the pressure the vehicle exerts on the ground

8.2 EFFECT OF FORCE (PRESSURE)

by KASMAWATI Moe

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