Force And Pressure Worksheet

Objective Type Questions

1. Fill in the blanks:
   A force of friction is an example of ___________ force.
   
   
2. Match the following:
   

   Column  A	Column  B
   (i)  Pressure	(a)  Contact force
   (ii)  Newton	(b)  Force per unit area
   (iii)  Pascal	(c)   Unit of volume
   	(d)  Unit of pressure
   	(e)  Unit of force

3. Find the odd one out:
   Fruits falling to the ground, Goalkeeper saving a goal, Box sliding down the inclined plane, pulling the door
   
   
4. State whether the statement is true or false:
   Gases exert pressure on the wall of their container.
   
   Multiple Choice Questions
   
   
5. Two objects repel each other. This repulsion could be due to
   (a) frictional force only
   (b) electrostatic force only
   (c) magnetic force only
   (d) either a magnetic or an electrostatic force
   
   
6. Muscular force is a ___________ force.
   (a) non-contact
   (b) contact
   (c) balanced
   (d) unbalanced
   
   
7. Which of the following force is a non-contact force?
   (a) Frictional force
   (b) Electrostatic force
   (c) Air resistance
   (d) Elastic force
   
   
8. When a hammer strikes the gong of an electric bell, which of the following force is responsible for the movement of the hammer?
   (a) Gravitational force
   (b) Magnetic force
   (c) Electrostatic force
   (d) Frictional force
   
   
9. The pressure exerted by the air around us is known as
   (a) force
   (b) muscular force
   (c) atmospheric pressure
   (d) friction
   
   
   Subjective Questions
   
   
10. A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough. 
    
    
11. What are the effects of force?
    
    
12. A force of 100 N is applied on an area of 4 m². Compute pressure being applied to the area.
    
    
13. Explain using an example that force can cause a change in the individual parts of a body or an object. 
    
    
14. The walls of dams are made thicker at the bottom. Give reason. 
    
    
15. During sieving grains, small pieces fall down. Which force pulls them down?
    
    
16. Why do the drawing pins have pointed tips?
    
    
17. Which force causes the charged comb to attract the pieces of paper? 
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
18. Assertion: When two stones are placed on a plane surface, they gravitationally attract each other.
    Reason: There is gravitational attraction between each and every object in the Universe.
    
    
19. Assertion: At least two objects must interact for forces to come into play.
    Reason: Force can be applied only when it is in contact with an object.
    
    Case-Based Questions
    
    
20. Riddhi takes a large plastic bottle filled with water. She places it on a horizontal surface and makes a series of holes in the bottle wall, as shown in the diagram below. Holes A, B, C, and D are on the same side of the bottle, while hole E is made on the other side but is on the same level as that of hole D. The water spurts out through each hole. Answer the following questions based on this information:
    
    (a)What is the observation about the water stream coming out from holes D and E?
    (b)What does the observation made in question 20 (a) proves?
    (c)Through which hole, the water gushes out with more pressure? Why?
    (d)What conclusions can be made from this experiment?

Objective Type Questions

1. Fill in the blanks:
   A force of friction is an example of ___________ force. 
   Solution:
   A force of friction is an example of contact force.
   
   
2. Match the following:
   

   Column  A	Column  B
   (i)  Pressure	(a)  Contact force
   (ii)  Newton	(b)  Force per unit area
   (iii)  Pascal	(c)   Unit of volume
   	(d)  Unit of pressure
   	(e)  Unit of force

   Solution:
   

   Column  A	Column  B
   (i)  Pressure	(b) Force per unit area
   (ii)  Newton	(e) Unit of force
   (iii)  Pascal	(d) Unit of pressure

3. Find the odd one out:
   Fruits falling to the ground, Goalkeeper saving a goal, Box sliding down the inclined plane, pulling the door
   Solution:
   Fruits falling to the ground. 
   It is an example of non–contact force (gravitational force) while others are examples of contact force.
   
   
4. State whether the statement is true or false:
   Gases exert pressure on the wall of their container.
   Solution:
   True. 
   
   Multiple Choice Questions
   
   
5. Two objects repel each other. This repulsion could be due to
   (a) frictional force only
   (b) electrostatic force only
   (c) magnetic force only
   (d) either a magnetic or an electrostatic force
   Correct option: (d) either a magnetic or an electrostatic force
   Solution:
   Two objects repel each other. This repulsion could be due to either a magnetic or an electrostatic force.
   
   
6. Muscular force is a ___________ force.
   (a) non-contact
   (b) contact
   (c) balanced
   (d) unbalanced
   Correct option: (b) contact
   Solution: Muscular force is a contact force.
   
   
7. Which of the following force is a non-contact force?
   (a) Frictional force
   (b) Electrostatic force
   (c) Air resistance
   (d) Elastic force|
   Correct option: (b) Electrostatic force
   Solution: Electrostatic force is a non–contact force. 
   
   
8. When a hammer strikes the gong of an electric bell, which of the following force is responsible for the movement of the hammer?
   (a) Gravitational force
   (b) Magnetic force
   (c) Electrostatic force
   (d) Frictional force
   Correct option: (b) Magnetic force
   Solution: In an electric bell, the force responsible for the movement of the hammer is magnetic force, which is provided by an electromagnet present inside it.
   
   
9. The pressure exerted by the air around us is known as
   (a) force
   (b) muscular force
   (c) atmospheric pressure
   (d) friction
   Correct option: (c) atmospheric pressure 
   Solution: The pressure exerted by the air around us is known as atmospheric pressure. 
   
   Subjective Questions
   
   
10. A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough. 
    Solution:
    Muscular force.
    
    
11. What are the effects of force?
    Solution:
    a) A force can change the state of motion of an object.
    b) A force can change the speed as well as the direction of an object.
    • If the force is applied in the direction of the motion, then the speed of the object increases.
    • If the force is applied opposite to the direction of the motion, then the speed of the object decreases.
    c) A force can change the shape and size of the object.
    
    
12. A force of 100 N is applied on an area of 4 m². Compute pressure being applied to the area.
    Solution:
    Given:
    Force = 100N,
    Area = 4 m2
    Thus, Pressure = Force/Area = 100/4 = 25 N/m² or 25 Pa
    
    
13. Explain using an example that force can cause a change in the individual parts of a body or an object. 
    Solution:
    The examples explaining that force can cause a change in the individual parts of a body or an object are:
    a) In squeezing a piece of lemon, we make use of muscular force to extract its juice. This muscular force is exerted on the lemon by our fingers. As a result, the shape of the lemon gets changed.
    b) An athlete pushes the ground with his feet. His feet exert a muscular force on the ground. This allows him to jump over the bar. As a result, his state of motion gets changed.
    c) While hammering a hot piece of iron, the blacksmith changes the shape of the iron using his muscular force.
    
    
14. The walls of dams are made thicker at the bottom. Give reason. 
    Solution:
    a) The water pressure increases with depth. Hence, the water pressure is greater at the bottom of a dam.
    b) To withstand this large pressure the walls of the dam are made thicker.
    
    
15. During sieving grains, small pieces fall down. Which force pulls them down?
    Solution:
    The separation of small pieces in the sieving method is due to the earth's gravitational force. 
    
    
16. Why do the drawing pins have pointed tips?
    Solution:
    a) Pressure is inversely proportional to area. A pointed tip has a small area.
    b) When we try to push the drawing pins into the display board, we have to apply small force over a small area, which results in larger pressure.
    c) This makes it easy to pin up the paper to the display board. 
    
    
17. Which force causes the charged comb to attract the pieces of paper? 
    Solution:
    Electrostatic force. 
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
18. Assertion: When two stones are placed on a plane surface, they gravitationally attract each other.
    Reason: There is gravitational attraction between each and every object in the Universe.
    Correct option: (a) Both A and R are true, and R is the correct explanation of A.
    
    
19. Assertion: At least two objects must interact for forces to come into play.
    Reason: Force can be applied only when it is in contact with an object.
    Correct option: (a) A is true, but R is false. 
    Solution: While two objects must interact with each other for forces to come into play, the force can be either contact force or non–contact force.
    
    Case-Based Questions
    
    
20. Riddhi takes a large plastic bottle filled with water. She places it on a horizontal surface and makes a series of holes in the bottle wall, as shown in the diagram below. Holes A, B, C, and D are on the same side of the bottle, while hole E is made on the other side but is on the same level as that of hole D. The water spurts out through each hole. Answer the following questions based on this information:
    
    (a)What is the observation about the water stream coming out from holes D and E?
    (b)What does the observation made in question 20 (a) proves?
    (c)Through which hole, the water gushes out with more pressure? Why?
    (d)What conclusions can be made from this experiment?
    Solution:
    (a)Water coming out from holes D and E will fall at equal distances on the two sides of the bottle.
    (b)The observation made in the above question proves that the liquid exerts equal pressure at the same depth.
    (c)The water gushes out from hole A with larger pressure because water pressure increases with the depth of the container.
    (d)Conclusions made from the given experiment are:
    (i)Liquid exerts pressure sideways and on the walls of the container.
    (ii)The pressure will be the same in a liquid at the same level at all points.
    (iii)Pressure in a liquid increase with the increase in depth.