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9th Class Physics Chapter 4 Online Preparation
9th Class English Medium Subjects
9th Class Urdu Medium Subjects
Online Short Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "
Try The Short Questions For 9th Class Physics English Medium Chapter 4 Preparation
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Total Questions10
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Available Sets12
Physics (New Book) - 9th Class Physics English Medium Chapter 4 Preparation
Question # 1
Define parallel forces and types?
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Ans 1: In a plane, if number of forcesact on a
body such that their points of action are different, but lines of action are parallel to each other, then these forces are called parallel forces.There are two types of parallel forces1- like parallel forces, unlike parallel forces
Prepare Complete Set Wise Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "
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Set 1
10 Questions
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Set 2
10 Questions
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Set 3
10 Questions
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Set 4
10 Questions
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Set 5
10 Questions
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Set 6
10 Questions
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Set 7
10 Questions
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Set 8
10 Questions
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Set 9
10 Questions
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Set 10
10 Questions
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Set 11
10 Questions
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Set 12
10 Questions
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9th Class Physics English Medium Chapter 4 Preparation - Set 1
Question # 1
Define parallel forces and types?
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Ans 1: In a plane, if number of forcesact on a
body such that their points of action are different, but lines of action are parallel to each other, then these forces are called parallel forces.There are two types of parallel forces1- like parallel forces, unlike parallel forces
9th Class Physics English Medium Chapter 4 Preparation - Set 2
Question # 1
Think of a body which is at test but not in equilibrium
- Ans 1: When we throw a body in up ward direction at its highest position the body is at rest for a moment but it is not in equilibrium because no other force is present to cancel the force of weight.
9th Class Physics English Medium Chapter 4 Preparation - Set 3
Question # 1
Why the height of vehicles is kept as low as possible?
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Ans 1: We Know that smaller the height of
center of gravity of a body, greater will be its stability. The height of vehicles is kept low to lower their center of gravity and as a result their stability increases.
9th Class Physics English Medium Chapter 4 Preparation - Set 4
Question # 1
Differentiate between Axis of rotation and Mometn
- Ans 1: Axis of rotation The straight line passing through a body about which the body can rotate is called axis of rotation
- Ans 2: Moment arm The perpendicular distance between the axis of rotation and the line of action of the force is called the moment arm of the force.
9th Class Physics English Medium Chapter 4 Preparation - Set 5
Question # 1
What is difference between stable and unstable
- Ans 1: Stable: equilibrium: A body is said to be in stable equilibrium if after a slight tilt it return to its previous position.
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Ans 2: Example: A book on a table is example A book on a table is example of stable equilibriumUnstable equilibrium: If a body does not return to its previous position when sets free after a slightest till is said to be in unstable equilibrium
- Ans 3: Example: A pencil in a vertical position on its lip. When ever you leav it the pencil topples over about its tip and fall down
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Ans 4: Neutral equilibrium: If a body remains in its new position when disturbed from its previous position it is said to be in a state of neutral equilibriumExample: In neutral equilibrium the centre of gravity of the body remains at the same height irrespective to its new position.
9th Class Physics English Medium Chapter 4 Preparation - Set 6
Question # 1
On doubling the moment arm, what will be its effect on the value of torque
- Ans 1: On doubling the moment arm the value of torque will also be double
9th Class Physics English Medium Chapter 4 Preparation - Set 7
Question # 1
Define Resultant Vector
- Ans 1: A resultant vector is a single vector that has the same effect as the combined effect of all vector to be added
9th Class Physics English Medium Chapter 4 Preparation - Set 8
Question # 1
How head to tail rule helps us to find resultant of vectors
- Ans 1: To determine resultant vector by head to tail rule we have to draw the resultant vector from head of last to tail of 1st vector It given us resultant graphically
9th Class Physics English Medium Chapter 4 Preparation - Set 9
Question # 1
What is head to tail rule
- Ans 1: When two or more than two vectors are added such that the head of the first vector is joined with tail of second vector and finally the tail of first vector is joined with the head of the second vector. This method of addition is called head to tail rule. The vector joining the tail of first vector to the head of last vector is called resultant vector a Graphical method used to find the resultant of two or more forces is called head to tail rule.
9th Class Physics English Medium Chapter 4 Preparation - Set 10
Question # 1
Which factor torque depends.
- Ans 1: Torque = F X L So, Torque depends upon force and moment arm.
9th Class Physics English Medium Chapter 4 Preparation - Set 11
Question # 1
Define Resolution of forces
- Ans 1: Forces into their component forces is called resolution of forces
- Ans 2: Perpendicular components: The components of a vector which make an angle of 90 with each other are called perpendicular components.
- Ans 3: Direction of force F: The direction of force F with X-axis is given by using the trigonometric ratio.
9th Class Physics English Medium Chapter 4 Preparation - Set 12
Question # 1
What is 2nd condition for equilibrium?
- Ans 1: A body is said to be satisfy 2nd condition of equilibrium if the resultant torque acting on a body is zero.
9th class Physics Chapter 4 (English Medium)
Here you can prepare 9th Physics Chapter 4 online Short Questions Preparation (Turning Effect of Forces). Click the button for 100% free full Preparation.
