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9th Class Physics Chapter 3 Online Preparation
9th Class English Medium Subjects
9th Class Urdu Medium Subjects
Online Short Questions For Chapter 3 "9th Class Physics English Medium Chapter 3 Preparation "
Try The Short Questions For 9th Class Physics English Medium Chapter 3 Preparation
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Total Questions10
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Available Sets10
Physics (New Book) - 9th Class Physics English Medium Chapter 3 Preparation
Question # 1
Write two method of reducing friction.
- Ans 1: Making the sliding surfaces smooth By converting sliding friction into rolling friction.
Prepare Complete Set Wise Questions For Chapter 3 "9th Class Physics English Medium Chapter 3 Preparation "
9th Class Physics English Medium Chapter 3 Preparation - Set 1
Question # 1
Write two method of reducing friction.
- Ans 1: Making the sliding surfaces smooth By converting sliding friction into rolling friction.
9th Class Physics English Medium Chapter 3 Preparation - Set 2
Question # 1
Why friction opposes motion
- Ans 1: Definition: The force that apposes the motion of moving objects is called friction
- Ans 2: Explanation: Friction opposes motion because no surface is perfectly smooth due to which the contact These cold welds resist the surface together and motion stops steady For example a moving ball stops on the floor due to firction.
9th Class Physics English Medium Chapter 3 Preparation - Set 3
Question # 1
A force of 20n moves a body with an acceleration of 2
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Ans 1: Given data Force=F=20Nacceleration =a=2msm=?We know that f=ma
9th Class Physics English Medium Chapter 3 Preparation - Set 4
Question # 1
What is the difference between action and reaction
- Ans 1: Action: The force exerted by external agency on a system is called action.
- Ans 2: Reaction: Response of the system to the force exerted by the external agency is called reaction.
9th Class Physics English Medium Chapter 3 Preparation - Set 5
Question # 1
Action and reaction are always equal and opposite. Then how does a body
Action and reaction are always equal and opposite. Then how does a body moves ?
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Ans 1: Action and reaction are equal in magnitude butopposite in direction.Action and reaction do not act on the same body.
Action is applied on the body due to which an equal and opposite reaction is acting on another body. Both of these do not neutralize each other due to which the body will move
9th Class Physics English Medium Chapter 3 Preparation - Set 6
Question # 1
Why is it easy to roll a cylindrical eraser on a paper sheet than to slide it?
- Ans 1: Because the sliding friction is greater than rolling friction. So rolling is easy than sliding .
9th Class Physics English Medium Chapter 3 Preparation - Set 7
Question # 1
State first law of motion.
- Ans 1: A body continues its state of rest or of uniform motion in a straight line provided no net force acts on it. It is also called law of inertia.
9th Class Physics English Medium Chapter 3 Preparation - Set 8
Question # 1
State the principle of motion of Rocket
- Ans 1: A rocket moves on the principle of newton's third law of motion When its fuel burns hopt gases escape out from its tail with a very high speed The reaction of these gases on the rocket causes it to move opposite to the gases rushing out of it to move opposite to the gasses rushing out of its tail.
9th Class Physics English Medium Chapter 3 Preparation - Set 9
Question # 1
How can you relate a force with the change of momentum of a body
- Ans 1: When a force acts on a body it produces acceleration in the body and it will be equal to the rate of change of momentum of the body.
9th Class Physics English Medium Chapter 3 Preparation - Set 10
Question # 1
State newton's third law of motion.
- Ans 1: To every action there is alwasys an equal but opposite reaction e.g. a launching of rocket.
