Force and Pressure Important questions

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Question 1.
FILL IN THE BLANKS:
1. When we push or pull anything to shift one place to another and to stop any moving object. This phenomenon is called _________.
2. The SI unit of the magnitude of force is __________.
3. Force can be applied to move _____________ objects.
4. A type of force that requires physical contact is called __________ force.
5. The force of attraction produced by the earth to attract every object to its surface is called ___________ force.

Answer

1. Force
2. Newton (N)
3. Stationary
4. Contact
5. Gravitational

Question 2.
STATE THE FOLLOWING STATEMENTS AS TRUE OR FALSE:
1. A magnetic force is only an attractive force.
2. The electrostatic force of attraction does not require physical contact between the objects.
3. When two or more forces acting on an object then the net effect is zero, this type of force are unbalanced force.
4. Pressure is defined as the Area divided by Force.
5. We measure pressure in Pascal (Pa) unit.

Answer

1. False
2. True
3. False
4. False
5. True

Question 3.
UNSCRAMBLE THE FOLLOWING WORDS:
1. EARA
2. RUSTHT
3. EWTONN
4. ESSURPER
5. ORCEF

Answer

1. AREA
2. THRUST
3. NEWTON
4. PRESSURE
5. FORCE

Question 4.
Name the following words:
1. It is the SI unit of the force.
2. A type of force in which physical contact is essential to produce a force.
3. It is a type of contact force in which the action of muscles of our body is required.
4. This type of force has opposite direction to the direction of motion.
5. This type of force is created by a machine.
6. Gravitational, magnetic and electrostatic force are examples of this force.
7. In this force, the charged body exerts a force on a charged or uncharged body.
8. Due to this force, any object attracts towards the Earth’s surface.
9. It is the SI unit of pressure.
10. This force acts on perpendicularly over the surface.

Answer

1. Newton
2. Contact force
3. Muscular force
4. Frictional force
5. Mechanical force
6. Non-contact force
7. Electrostatic force
8. Gravitational force
9. Pascal
10. Normal force

Question 5.
Very short answer type questions:
(i)Write any two types of contact force.
(ii)Write any two types of non-contact force.
(iii)Write the formula of pressure in the case of normal force.
(iv)How many Pascal in one bar?
(v)Which instrument is used to measure the liquid pressure?

Answer

(i)Muscular and frictional force.
(ii)Electrostatic and gravitational force.
(iii)Pressure= Thrust/Area
(iv)1 bar= 105 Pa
(v)Manometer

Question 6.
Short answer type questions:
(i)What is atmospheric pressure?
(ii)Who invented the Torricelli barometer?
(iii)What is one atmosphere?
(iv)Why do farmers use tractors for cultivation?
(v)Why do astronauts wear spacesuit while going in the space?

Answer

(i)Atmospheric pressure is a pressure exerted by the atmosphere on the Earth’s surface.
(ii)Evangelista Torricelli, one of the students of Galileo Galilei.
(iii)The height of the mercury measured by the barometer, which is about 76 cm, at sea level denoted by one atm is called one atmosphere.
(iv)Farmers use tractors for cultivation because tractors have broad tyres that can produce less pressure on the ground. Therefore, they do not sink and move easily.
(v)Astronauts wear spacesuit because there is no atmosphere in the space.

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