Physics English Medium 9th Class Chapter 4 Turning Effect of Forces Short Question with Answers

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Online Short Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "

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Physics (New Book) - 9th Class Physics English Medium Chapter 4 Preparation

Question # 1

Define axis of rotation.

Ans 1: The line about which a body rotates is called axis of rotation.

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Prepare Complete Set Wise Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "

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Set 4

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Set 7

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Set 10

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Set 11

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9th Class Physics English Medium Chapter 4 Preparation - Set 1

Question # 1

Define axis of rotation.

Ans 1: The line about which a body rotates is called axis of rotation.

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9th Class Physics English Medium Chapter 4 Preparation - Set 2

Question # 1

Differentiate between clockwise and anti-clockwise moment

Ans 1: Clockwise Moment: The force that trrns a spanner in the clockwise direction is known is clockwise force. The torque or moment of force produced to this force is called clockwise moment
The moment produced during tighten a nut
Ans 2: Anti-Clockwise moment: The force that turns a spanner in the anticlockwise direction is called known as anticlockwise force. The torque or moment of force is called anticlockwise moment
The moment produced during loosing a nut

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9th Class Physics English Medium Chapter 4 Preparation - Set 3

Question # 1

Explain 1st condition for equilibrium.

Ans 1: A body is said satisfy first condition of equilibrium if the resultant of all these forces acting on it is zero.
F=0

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9th Class Physics English Medium Chapter 4 Preparation - Set 4

Question # 1

Define couple arm

Ans 1: The perpendicular distance between two force of couple is called couple arm

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9th Class Physics English Medium Chapter 4 Preparation - Set 5

Question # 1

Why a body regain its previous state in stable equilibrium

Ans 1: Because in stable equilibrium its centre of gravity is at the lowest position

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9th Class Physics English Medium Chapter 4 Preparation - Set 6

Question # 1

Define moment arm.

Ans 1: The perpendicular distance between the axis of rotation and line of action of force is called moment arm.

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9th Class Physics English Medium Chapter 4 Preparation - Set 7

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.

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9th Class Physics English Medium Chapter 4 Preparation - Set 8

Question # 1

What is centre of gravity.

Ans 1: A point where the whole weight of the body appears to act vertically downward is called centre of gravity of a body e.g. centre of gravity of uniform rod is centre of the rod.

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9th Class Physics English Medium Chapter 4 Preparation - Set 9

Question # 1

Define torque and Center of mass

Ans 1: Torque: The turning effect of a force is called torque or moment of the force
Ans 2: Mathematically: Torque=f*L
Ans 3: Unit: SI unit of torque is Newton meter
Ans 4: Center of mass: Centre of mass of a system is such a oint where an applied force causes the system to move with out rotation
Rigid Body: A body is composed of large number of small particles. If the distance between all pairs of particles of the body do not change by applying of force then, it is called rigid body A rigid body is the one that is not deformed by force or force acting on it.
Ans 5: Moment Arm The perpendicular distance between the axis of rotation and the line of force is called moment arm of the force
Equation: In the expression Where L represents the moment arm of the force F

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9th Class Physics English Medium Chapter 4 Preparation - Set 10

Question # 1

What is meant by Couple of forces

Ans 1: Couple: A Couple is formed by two unlike parallel forces of the same magnitude but not along the same line.
Ans 2: Example: When a driver turns a vehicle, he applies forces that produce a torque. This torque turns the steering wheel These forces act on opposite sides of the steering wheel are equal in magnitude but opposite in direction. These two forces form a couple

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9th Class Physics English Medium Chapter 4 Preparation - Set 11

Question # 1

Why the height of vehicles is kept as low as possible?

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.

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9th Class Physics English Medium Chapter 4 Preparation - Set 12

Question # 1

Define axis of rotation.

Ans 1: The line about which a body rotates is called axis of rotation.

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Matric Part 1/9th Class Physics Chapter 4 Short Question Test With Answer for Unit 4 Turning Effect of Forces

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Online Short Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "

Physics (New Book) - 9th Class Physics English Medium Chapter 4 Preparation

Define axis of rotation.

Can force be added by ordinary addition of number

What is perpendicular

Define resolution of vectors

Differentiate between like and unlike forces.

Define plumb line?

Define rigid body and give an example.

Differentiate between torque and couple.

Difference between Center of mass and center gravity?

How can we increase the stability of a vehicle

Prepare Complete Set Wise Questions For Chapter 4 "9th Class Physics English Medium Chapter 4 Preparation "

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9th Class Physics English Medium Chapter 4 Preparation - Set 1

Define axis of rotation.

Can force be added by ordinary addition of number

What is perpendicular

Define resolution of vectors

Differentiate between like and unlike forces.

Define plumb line?

Define rigid body and give an example.

Differentiate between torque and couple.

Difference between Center of mass and center gravity?

How can we increase the stability of a vehicle

9th Class Physics English Medium Chapter 4 Preparation - Set 2

Differentiate between clockwise and anti-clockwise moment

Define trigonometry

What is line of action of force.

Explain 1st condition for equilibrium.

Give an example of a moving body which is in equilibrium?

What is meant by principle of moments

Why the height of vehicles is kept as low as possible?

Think of a body which is at rest but not in equilibrium

What is meant by resolution of forces?

Does the speed of a ceiling fan go on increasing all the time.

9th Class Physics English Medium Chapter 4 Preparation - Set 3

Explain 1st condition for equilibrium.

Define centre of mass

Define parallel forces

What is directional graph

What is meant by principle of moments

Write the types of parallel forces

What is meant by additionof forces?

Why a body does not regain its previous state in unstable equilibrium

Discuss centre of gravity of some symmetrical object

Define like parallel forces

9th Class Physics English Medium Chapter 4 Preparation - Set 4

Define couple arm

What is difference between stable and unstable

Define Centre of mass of a body

Define equilibrium

At which point an applied force does not produce rotation

Define rigid body and give an example

Differentiate between torque and couple

How a force can be resolved into its prependicular components

What is meant by principle of moments

Define equilibrium. and give one example.

9th Class Physics English Medium Chapter 4 Preparation - Set 5