Class 8 physics Chapter - FORCE, Frictions and Pressure
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CLASS 8 PHYSICS
CHAPTER - FORCE, FRICTIONS AND PRESSURE |
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Test yourself |
Question 1: What is a force? A) Energy B) Mass C) Push or pull on an object D) Speed
Hint: Think about what causes an object to start moving, stop moving, or change its direction.
Answer: C) Push or pull on an object
Question 2: Which of the following is an example of a contact force? A) Magnetism B) Gravitational force C) Friction D) Air resistance
Hint: This type of force occurs when objects are physically touching each other.
Answer: C) Friction
Question 3: What force opposes the motion of objects as they slide or move through a surface? A) Gravitational force B) Tension force C) Frictional force D) Magnetic force
Hint: It's the force that makes it difficult to slide a box across the floor.
Answer: C) Frictional force
Question 4: When the same force is applied to two objects of different masses, which object will accelerate more? A) Heavier object B) Lighter object C) Both will accelerate the same D) Neither will accelerate
Hint: Think about how mass influences an object's response to force.
Answer: B) Lighter object
Question 5: What is the SI unit of force? A) Watt B) Volt C) Newton D) Ohm
Hint: This unit is named after a famous scientist who made significant contributions to the understanding of motion and force.
Answer: C) Newton
Question 6: If the force acting on an object is doubled, how does its acceleration change, assuming the mass remains constant? A) Acceleration is halved B) Acceleration is doubled C) Acceleration remains the same D) Acceleration is quadrupled
Hint: Remember the relationship between force and acceleration.
Answer: B) Acceleration is doubled
Question 7: When you press a book against a table, what type of force is involved? A) Tension force B) Gravitational force C) Normal force D) Frictional force
Hint: This force prevents the book from falling through the table.
Answer: C) Normal force
Question 8: Which type of force keeps an object in equilibrium? A) Tension force B) Resultant force C) Unbalanced force D) Balanced force
Hint: When all forces acting on an object cancel each other out, this type of force is achieved.
Answer: D) Balanced force
Question 9: What property of a surface determines the amount of friction between two objects? A) Color of the surface B) Temperature of the surface C) Roughness of the surface D) Density of the surface
Hint: Smooth surfaces have less of this property, leading to less friction.
Answer: C) Roughness of the surface
Question 10: What does Pascal's principle state? A) Pressure applied to a fluid is transmitted undiminished to every point of the fluid B) Pressure decreases with increasing depth in a fluid C) The density of a fluid remains constant under all conditions D) Fluid pressure is inversely proportional to the area of the container
Hint: Think about how pressure spreads through a fluid.
Answer: A) Pressure applied to a fluid is transmitted undiminished to every point of the fluid
Encourage your students to use these questions to challenge their understanding of the concepts covered in Class 8 Physics, Chapter - "Force, Friction, and Pressure." By providing hints, you're fostering critical thinking skills and helping them develop a deeper comprehension of the topic.
Hint: Think about what causes an object to start moving, stop moving, or change its direction.
Answer: C) Push or pull on an object
Question 2: Which of the following is an example of a contact force? A) Magnetism B) Gravitational force C) Friction D) Air resistance
Hint: This type of force occurs when objects are physically touching each other.
Answer: C) Friction
Question 3: What force opposes the motion of objects as they slide or move through a surface? A) Gravitational force B) Tension force C) Frictional force D) Magnetic force
Hint: It's the force that makes it difficult to slide a box across the floor.
Answer: C) Frictional force
Question 4: When the same force is applied to two objects of different masses, which object will accelerate more? A) Heavier object B) Lighter object C) Both will accelerate the same D) Neither will accelerate
Hint: Think about how mass influences an object's response to force.
Answer: B) Lighter object
Question 5: What is the SI unit of force? A) Watt B) Volt C) Newton D) Ohm
Hint: This unit is named after a famous scientist who made significant contributions to the understanding of motion and force.
Answer: C) Newton
Question 6: If the force acting on an object is doubled, how does its acceleration change, assuming the mass remains constant? A) Acceleration is halved B) Acceleration is doubled C) Acceleration remains the same D) Acceleration is quadrupled
Hint: Remember the relationship between force and acceleration.
Answer: B) Acceleration is doubled
Question 7: When you press a book against a table, what type of force is involved? A) Tension force B) Gravitational force C) Normal force D) Frictional force
Hint: This force prevents the book from falling through the table.
Answer: C) Normal force
Question 8: Which type of force keeps an object in equilibrium? A) Tension force B) Resultant force C) Unbalanced force D) Balanced force
Hint: When all forces acting on an object cancel each other out, this type of force is achieved.
Answer: D) Balanced force
Question 9: What property of a surface determines the amount of friction between two objects? A) Color of the surface B) Temperature of the surface C) Roughness of the surface D) Density of the surface
Hint: Smooth surfaces have less of this property, leading to less friction.
Answer: C) Roughness of the surface
Question 10: What does Pascal's principle state? A) Pressure applied to a fluid is transmitted undiminished to every point of the fluid B) Pressure decreases with increasing depth in a fluid C) The density of a fluid remains constant under all conditions D) Fluid pressure is inversely proportional to the area of the container
Hint: Think about how pressure spreads through a fluid.
Answer: A) Pressure applied to a fluid is transmitted undiminished to every point of the fluid
Encourage your students to use these questions to challenge their understanding of the concepts covered in Class 8 Physics, Chapter - "Force, Friction, and Pressure." By providing hints, you're fostering critical thinking skills and helping them develop a deeper comprehension of the topic.
Learnwell science class 8
1. Why are women advised not to wear high heeled shoes?
Ans: High heeled shoes do not distribute weight of body over the surface of and therefore women may fall on the ground due to less grips on ground. This is why women are advised not to wear high heeled shoes.
2. It is more difficult to pull boat on the beach than on the water?
Ans: Liquid and gases exert lesser friction as compared to solid surfaces. Therefore, boat on the beach experience more friction than on the water. Thus, it is more difficult to pull boat on the beach than on the water.
3. How are you able to drink juice using a straw?
Ans: Ans: When we suck air from straw the air pressure in the straw decreases that is enough to pull the juice. Air pressure pull the juice to move up inside the straw into our mouth .
4. Why is the tip of sewing needle sharp?
Ans: The sharp tip of sewing needle sharp distributes force over less are so that more pressure created on the clothes. This makes work with needle easier.
5. Why are powder sprinkled on the carom board before playing?
Ans: Powder sprinkled on the carom board before playing to reduce friction between coins and surface of carom board.
6. Why does a woman apply soap solution on their hand to put on bangles?
Ans: A woman apply soap solution on their hand to reduce friction so that it became easier to put on bangles .
7. Does the shoes having spikes on their sole help in making better grip on ice?
Ans: Yes, spikes increase friction and help to have better grip on ice.
8. Will a match stick catch fire when it is rubbed against cemented wall?
Ans: Yes. A match stick catches fire when it is rubbed against cemented wall because force of friction raises the temperature of match stick head.
9. What would happen if there is no friction?
Ans: Friction is the force that opposes the motion of every object. So if there is no friction then, there would be nothing to stop a moving object, and it would continue to move forever
10. Machine parts are oiled occasionally. Why?
Ans: Lubricant like oil and grease form layer between the two moving surfaces so that they cannot directly rub each other. This make the movement smoother.
1. Why are women advised not to wear high heeled shoes?
Ans: High heeled shoes do not distribute weight of body over the surface of and therefore women may fall on the ground due to less grips on ground. This is why women are advised not to wear high heeled shoes.
2. It is more difficult to pull boat on the beach than on the water?
Ans: Liquid and gases exert lesser friction as compared to solid surfaces. Therefore, boat on the beach experience more friction than on the water. Thus, it is more difficult to pull boat on the beach than on the water.
3. How are you able to drink juice using a straw?
Ans: Ans: When we suck air from straw the air pressure in the straw decreases that is enough to pull the juice. Air pressure pull the juice to move up inside the straw into our mouth .
4. Why is the tip of sewing needle sharp?
Ans: The sharp tip of sewing needle sharp distributes force over less are so that more pressure created on the clothes. This makes work with needle easier.
5. Why are powder sprinkled on the carom board before playing?
Ans: Powder sprinkled on the carom board before playing to reduce friction between coins and surface of carom board.
6. Why does a woman apply soap solution on their hand to put on bangles?
Ans: A woman apply soap solution on their hand to reduce friction so that it became easier to put on bangles .
7. Does the shoes having spikes on their sole help in making better grip on ice?
Ans: Yes, spikes increase friction and help to have better grip on ice.
8. Will a match stick catch fire when it is rubbed against cemented wall?
Ans: Yes. A match stick catches fire when it is rubbed against cemented wall because force of friction raises the temperature of match stick head.
9. What would happen if there is no friction?
Ans: Friction is the force that opposes the motion of every object. So if there is no friction then, there would be nothing to stop a moving object, and it would continue to move forever
10. Machine parts are oiled occasionally. Why?
Ans: Lubricant like oil and grease form layer between the two moving surfaces so that they cannot directly rub each other. This make the movement smoother.
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