Force and Pressure Important Question Answer
Here are the answers to important questions on force and pressure, which are useful for students who want to score good marks in class 8 science subject exams. The information about important questions and answers given here will help you in preparing for class 8 exams. Questions and answers related to force and pressure are taught to us under science. In this post, important questions and their answers are given for those who are looking for information related to the lesson force and pressure. These questions have been asked in the exam earlier also.
Question 1: Why are the following actions similar: kicking, hitting, lifting, pulling?
Answer: In all the above actions, force is applied to change the motion of an object.
Question 2: By what names can actions related to motion be known?
Answer: Pulling or pushing.
Question 3: What is force?
Answer: Force is a pull or push that changes or tries to change the motion or shape of an object.
Question 4: What is meant by pressure?
Answer: Pressure is the force applied per unit area.
Question 5: Describe an example of how force can change the motion of an object.
Answer: Suppose you are cycling at a speed of 10 m/s from north to south. If your friend pushes you in the same direction, your speed increases.
Question 6: Show with an action how force changes the shape of an object.
Answer: When a rubber ball is pressed between the palms, its shape changes from round to flat-round.
Question 7: Show with an action how force changes both the motion and direction of an object.
Answer: When a ball thrown by a bowler hits the bat, both its motion and direction change.
Question 8: Show with an action how force changes the direction of a moving object.
Answer: In a football game, kicking a moving ball can change its direction.
Question 9: What happens when force is applied in the direction of motion?
Answer: The speed increases.
Question 10: What happens when an equal force is applied in the opposite direction?
Answer: The net force will be zero, meaning the object will not move in any direction.
Question 11: What is contact force?
Answer: Contact force is the force applied when two objects come into contact with each other.
Question 12: Give an example of contact force.
Answer: Muscular and frictional forces.
Question 13: What type of force is gravitational force?
Answer: Non-contact force.
Question 14: Give an example of a non-contact force.
Answer: Magnetic force.
Question 15: What is electrostatic force?
Answer: The force exerted by charged objects.
Question 16: How can pressure be increased or decreased?
Answer: By changing the area.
Question 17: Why is the foundation of a wall made broad?
Answer: To reduce the pressure on the base of the wall.
Question 19: What kind of tool is needed for cutting or piercing?
Answer: A sharp-edged tool.
Question 20: Do liquids and gases exert pressure?
Answer: Yes.
Question 21: Why does a tube inflate when air is pumped into it?
Answer: Because of the increased pressure of the air on the walls of the tube.
Question 22: On what principle does a fountain work?
Answer: Liquids exert pressure.
Question 23: What is the atmospheric layer around the Earth called?
Answer: Atmosphere.
Question 24: Is atmospheric pressure high or low?
Answer: High.
Question 25: Can humans or other creatures be crushed by atmospheric pressure?
Answer: Never.
Question 26: How can a moving ball be stopped?
Answer: By applying force in the opposite direction of its motion.
Question 27: Can the motion of an object on a flat surface slow down? If yes, why?
Answer: The motion of a moving object can slow down on a flat surface due to friction between the object and the surface, which exerts a force in the opposite direction, reducing its speed.
Question 28: When is the net force zero? Give an example.
Answer: The net force is zero when two equal and opposite forces are applied on an object. Example: the game of tug-of-war.
Question 29: Is force a vector quantity? How?
Answer: A vector quantity has both magnitude and direction. To define force, knowledge of both magnitude and direction is necessary. Hence, force is a vector quantity.
Question 30: What is meant by the state of motion of an object?
Answer: The speed and direction of an object are called its state of motion. When an object is at rest, its speed is zero. Changes in speed and direction alter the state of motion.
Question 31: Why is gravitational force called a non-contact force? Explain.
Answer: Gravitational force acts on objects on or above the Earth’s surface. It also acts on distant objects. For example, leaves fall from trees, water flows downward in rivers, and the moon orbits the Earth. In all these examples, the objects are not in contact with the Earth. Therefore, it is called a non-contact force.
Question 32: Give some examples of muscular force.
Answer: Walking, breathing, running, lifting, skating on ice, hitting, etc., require muscular force.
Question 33: Give an example of contact force.
Answer: In a carrom board game, when one piece hits another, the stationary piece starts moving. This is an example of contact force.
Question 34: Why is a sharp-edged knife needed to cut fruit?
Answer: A sharp-edged knife exerts more pressure on the fruit, making it easier to cut.
Question 35: Where is pressure the highest and lowest in a bottle filled with water?
Answer: The pressure is highest at the bottom of the bottle and lowest at the top.
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