Podcast
Questions and Answers
Why does the child move his hand backwards along with the ball when catching it?
Why does the child move his hand backwards along with the ball when catching it?
- The ball exerts a force on the child's hand pushing it backward. (correct)
- The child applies an equal and opposite force to stop the ball.
- To prevent the ball from bouncing back.
- It is the child's natural reflex to move their hand back.
Why does the rope only move in one direction during a tug of war, even though both teams are applying force?
Why does the rope only move in one direction during a tug of war, even though both teams are applying force?
- The rope is designed to only move in one direction.
- The force applied by the stronger team overcomes the force applied by the weaker team. (correct)
- The forces applied by both teams are balanced.
- The team pulling in the opposite direction is weaker.
What is the resultant force if a 100 N force is applied in the east direction and a 150 N force is applied in the west direction?
What is the resultant force if a 100 N force is applied in the east direction and a 150 N force is applied in the west direction?
50 N towards the west
The forces acting on a body are said to be balanced forces if the resultant force is zero.
The forces acting on a body are said to be balanced forces if the resultant force is zero.
In the tug of war shown in the figure, is the resultant force experienced on the rope balanced or unbalanced?
In the tug of war shown in the figure, is the resultant force experienced on the rope balanced or unbalanced?
All forces cause motion?
All forces cause motion?
When a vehicle is pushed from ______, it cannot move.
When a vehicle is pushed from ______, it cannot move.
What do you observe when a marble is rolled from end A in each situation?
What do you observe when a marble is rolled from end A in each situation?
Write down a practical definition for inertia.
Write down a practical definition for inertia.
What is the tendency of the object to continue in its state of rest or uniform motion?
What is the tendency of the object to continue in its state of rest or uniform motion?
What force is required to produce an acceleration of 1 m/s² on an object of mass 1 kg?
What force is required to produce an acceleration of 1 m/s² on an object of mass 1 kg?
A body of mass 12 kg is moving with an acceleration of 4 m/s². Calculate the force applied.
A body of mass 12 kg is moving with an acceleration of 4 m/s². Calculate the force applied.
A force of 40 N is applied on a body of mass 20 kg. Calculate the acceleration produced.
A force of 40 N is applied on a body of mass 20 kg. Calculate the acceleration produced.
A vehicle of mass 1000 kg is travelling with a velocity of 90 km/h. The vehicle comes to rest when brakes are applied for 5 s. Calculate the force applied.
A vehicle of mass 1000 kg is travelling with a velocity of 90 km/h. The vehicle comes to rest when brakes are applied for 5 s. Calculate the force applied.
What does a negative sign for the force typically indicate?
What does a negative sign for the force typically indicate?
A shot of mass 7 kg rolled on a level ground, with a velocity 2 m/s, came to rest in 5 s. Which force brought it to rest?
A shot of mass 7 kg rolled on a level ground, with a velocity 2 m/s, came to rest in 5 s. Which force brought it to rest?
What is the unit of impulse of force?
What is the unit of impulse of force?
A ball of mass 200 g is moving with a velocity of 30 m/s. A person catches the ball. If the time taken to bring the ball to rest is 0.3 s, what will be the force felt on the arm?
A ball of mass 200 g is moving with a velocity of 30 m/s. A person catches the ball. If the time taken to bring the ball to rest is 0.3 s, what will be the force felt on the arm?
What does a negative force value indicate in this scenario?
What does a negative force value indicate in this scenario?
Why do cricket players move their hands backward along with the ball while catching a fast moving ball?
Why do cricket players move their hands backward along with the ball while catching a fast moving ball?
What is the purpose of a foam bed in a pole vault pit?
What is the purpose of a foam bed in a pole vault pit?
What is the purpose of a sponge or hay placed between glass vessels while packing?
What is the purpose of a sponge or hay placed between glass vessels while packing?
An object in motion with no force applied will continue in its motion in a straight line or an object at rest will continue in its state of rest.
An object in motion with no force applied will continue in its motion in a straight line or an object at rest will continue in its state of rest.
What is the force of attraction between two objects of masses m1 and m2, separated by a distance d, according to the Universal Law of Gravitation?
What is the force of attraction between two objects of masses m1 and m2, separated by a distance d, according to the Universal Law of Gravitation?
If the distance between the two objects is doubled, what happens to the force of attraction between them?
If the distance between the two objects is doubled, what happens to the force of attraction between them?
Calculate the gravitational force of attraction between two children of masses 40 kg and 50 kg when they are 2 m apart.
Calculate the gravitational force of attraction between two children of masses 40 kg and 50 kg when they are 2 m apart.
Is Earth the sole contributor to the force of attraction experienced by objects on the planet?
Is Earth the sole contributor to the force of attraction experienced by objects on the planet?
What is the unit of acceleration due to gravity (g)?
What is the unit of acceleration due to gravity (g)?
Which of the following observations is NOT true about acceleration due to gravity (g)?
Which of the following observations is NOT true about acceleration due to gravity (g)?
What will be the acceleration of an object at the center of the Earth?
What will be the acceleration of an object at the center of the Earth?
Which region of the Earth is farthest from its center?
Which region of the Earth is farthest from its center?
What is the primary reason why objects like leaves or feathers fall slower than objects like rocks or coins in the air?
What is the primary reason why objects like leaves or feathers fall slower than objects like rocks or coins in the air?
Why does the acceleration of a satellite orbiting the Earth not depend on its mass?
Why does the acceleration of a satellite orbiting the Earth not depend on its mass?
What is the primary factor that influences the speed of a lander when it reaches the Moon?
What is the primary factor that influences the speed of a lander when it reaches the Moon?
Why is it essential to use large rockets to launch satellites into space?
Why is it essential to use large rockets to launch satellites into space?
If an object is lifted from the Earth's surface to a higher altitude, what happens to its mass and weight?
If an object is lifted from the Earth's surface to a higher altitude, what happens to its mass and weight?
Which of the following is NOT a characteristic of a freely falling object?
Which of the following is NOT a characteristic of a freely falling object?
Which of the following scenarios does NOT demonstrate weightlessness?
Which of the following scenarios does NOT demonstrate weightlessness?
The weight of an object at the Earth's center is zero.
The weight of an object at the Earth's center is zero.
What is the primary difference between the weight of an object measured on Earth and on the Moon?
What is the primary difference between the weight of an object measured on Earth and on the Moon?
What is the primary reason for the difference in weight between an object measured using a common balance and a spring balance?
What is the primary reason for the difference in weight between an object measured using a common balance and a spring balance?
What is the unit of weight?
What is the unit of weight?
Which type of motion does a stone tied to a string whirled in a circle exhibit when it covers equal distances in equal intervals of time?
Which type of motion does a stone tied to a string whirled in a circle exhibit when it covers equal distances in equal intervals of time?
What is the acceleration experienced by an object moving in a circular path?
What is the acceleration experienced by an object moving in a circular path?
A body can exhibit circular motion without any force acting on it.
A body can exhibit circular motion without any force acting on it.
The tendency of a vehicle to roll over while negotiating a curve is due to the centripetal force acting on it.
The tendency of a vehicle to roll over while negotiating a curve is due to the centripetal force acting on it.
What provides the centripetal force for artificial satellites orbiting the Earth?
What provides the centripetal force for artificial satellites orbiting the Earth?
Large rockets are extensively used to launch satellites into space to overcome the Earth's gravitational pull.
Large rockets are extensively used to launch satellites into space to overcome the Earth's gravitational pull.
What is the primary advantage of using less powerful rockets to launch a spacecraft to the Moon, as demonstrated by Chandrayaan-3?
What is the primary advantage of using less powerful rockets to launch a spacecraft to the Moon, as demonstrated by Chandrayaan-3?
What is the primary reason for the success of soft landing during lunar missions?
What is the primary reason for the success of soft landing during lunar missions?
If an object is thrown vertically upward from the surface of the Moon, what will happen to its initial velocity?
If an object is thrown vertically upward from the surface of the Moon, what will happen to its initial velocity?
What is the primary reason why the Moon's gravitational force affects the Earth, even though the Earth's mass is much larger than the Moon's?
What is the primary reason why the Moon's gravitational force affects the Earth, even though the Earth's mass is much larger than the Moon's?
Under what condition(s) will a freely falling object experience weightlessness?
Under what condition(s) will a freely falling object experience weightlessness?
Circular motion is a special case of uniform motion.
Circular motion is a special case of uniform motion.
What happens to an object's initial velocity when it is thrown vertically upwards from the Moon's surface?
What happens to an object's initial velocity when it is thrown vertically upwards from the Moon's surface?
What is the primary force that determines the time it takes for a freely falling object to reach the ground from a specific height?
What is the primary force that determines the time it takes for a freely falling object to reach the ground from a specific height?
A stone thrown vertically upwards from the Moon's surface returns to its initial position in 6 seconds.
A stone thrown vertically upwards from the Moon's surface returns to its initial position in 6 seconds.
A body falls freely from a certain height and takes 50 seconds to reach the ground. How much time will it take to fall from the same height on another sphere having twice the radius and twice the mass of the Earth?
A body falls freely from a certain height and takes 50 seconds to reach the ground. How much time will it take to fall from the same height on another sphere having twice the radius and twice the mass of the Earth?
Why are large rockets required to launch satellites into outer space?
Why are large rockets required to launch satellites into outer space?
The weight of a satellite in Earth's orbit is the same as its weight on Earth’s surface.
The weight of a satellite in Earth's orbit is the same as its weight on Earth’s surface.
What is the primary factor that influences the weight of an object on a celestial body?
What is the primary factor that influences the weight of an object on a celestial body?
The weight of an object on the Moon is approximately 1/6th of its weight on Earth.
The weight of an object on the Moon is approximately 1/6th of its weight on Earth.
Which of the following statements regarding the weight of an object on a celestial body is true?
Which of the following statements regarding the weight of an object on a celestial body is true?
The weight of an object is typically measured using a common balance.
The weight of an object is typically measured using a common balance.
What is the primary reason why a freely falling object experiences weightlessness?
What is the primary reason why a freely falling object experiences weightlessness?
A skydiver in freefall after deploying the parachute experiences weightlessness.
A skydiver in freefall after deploying the parachute experiences weightlessness.
What is the speed (approximate) of light in a vacuum?
What is the speed (approximate) of light in a vacuum?
What is the refractive index of air?
What is the refractive index of air?
What is the refractive index of a medium, if the speed of light in that medium is 2 × 10⁸ m/s?
What is the refractive index of a medium, if the speed of light in that medium is 2 × 10⁸ m/s?
The speed of light is higher in a medium of higher optical density.
The speed of light is higher in a medium of higher optical density.
Which of the following options increases the speed of a car?
Which of the following options increases the speed of a car?
What is the displacement of the child, if it moves from pole B to pole C, then pole D and finally reaches back to pole C?
What is the displacement of the child, if it moves from pole B to pole C, then pole D and finally reaches back to pole C?
If a child travels from pole B, reaches pole C and then travels 40 m further in the opposite direction, what will be the possible positions of the child?
If a child travels from pole B, reaches pole C and then travels 40 m further in the opposite direction, what will be the possible positions of the child?
What is the rate of change of velocity called?
What is the rate of change of velocity called?
What is the unit of acceleration?
What is the unit of acceleration?
A car traveling at** 10 m/s** has an acceleration of 5 m/s². What is the velocity of the car after 2 seconds?
A car traveling at** 10 m/s** has an acceleration of 5 m/s². What is the velocity of the car after 2 seconds?
If an object starts from rest, it means initial velocity is zero.
If an object starts from rest, it means initial velocity is zero.
An object moving in the same direction, with equal displacement at equal time intervals is in non-uniform velocity.
An object moving in the same direction, with equal displacement at equal time intervals is in non-uniform velocity.
Which of the following options describes uniform velocity?
Which of the following options describes uniform velocity?
What is the reason why a bus, initially at rest, will tend to fall backwards when it suddenly moves forward?
What is the reason why a bus, initially at rest, will tend to fall backwards when it suddenly moves forward?
Why does a coconut fall down from a mango tree when we shake the branch?
Why does a coconut fall down from a mango tree when we shake the branch?
The inertia of an object is directly proportional to its mass.
The inertia of an object is directly proportional to its mass.
If two forces act on an object, one to the ______ and one to the ______ , they are called balanced forces.
If two forces act on an object, one to the ______ and one to the ______ , they are called balanced forces.
What happens to a toy car when equal weights are placed on both ends?
What happens to a toy car when equal weights are placed on both ends?
What happens to a toy car moving forward when more weight is added to the pan on the same side?
What happens to a toy car moving forward when more weight is added to the pan on the same side?
What happens to the toy car moving forward when more weight is added to the pan on the opposite side?
What happens to the toy car moving forward when more weight is added to the pan on the opposite side?
A force can be applied to an object from within the object itself.
A force can be applied to an object from within the object itself.
A balanced force does not change the state of rest or motion of a body.
A balanced force does not change the state of rest or motion of a body.
Which of the following options is not correct regarding Galileo's observation about a marble rolling down an inclined plane?
Which of the following options is not correct regarding Galileo's observation about a marble rolling down an inclined plane?
According to Newton's First Law of motion, a body will continue to stay in its state of rest or uniform motion if balanced forces are acting on it.
According to Newton's First Law of motion, a body will continue to stay in its state of rest or uniform motion if balanced forces are acting on it.
What is the force responsible for bringing a falling coconut to rest?
What is the force responsible for bringing a falling coconut to rest?
If a body of mass 10 kg travels with a speed of 18 m/s from rest at a point, after 2 seconds, what is the rate of change of its momentum (in Newton)?
If a body of mass 10 kg travels with a speed of 18 m/s from rest at a point, after 2 seconds, what is the rate of change of its momentum (in Newton)?
When a rocket is launched, gases are produced in its chamber due to combustion of fuels, which move in one direction at high speed, While the rocket is propelled in the opposite direction. What is the reason behind this?
When a rocket is launched, gases are produced in its chamber due to combustion of fuels, which move in one direction at high speed, While the rocket is propelled in the opposite direction. What is the reason behind this?
The force exerted by a person on a vehicle is greater than the force exerted by the vehicle on the person.
The force exerted by a person on a vehicle is greater than the force exerted by the vehicle on the person.
The acceleration due to gravity is the same for objects of different masses when those objects fall simultaneously from the same height.
The acceleration due to gravity is the same for objects of different masses when those objects fall simultaneously from the same height.
Why do leaves or feathers fall slowly towards the ground?
Why do leaves or feathers fall slowly towards the ground?
The acceleration due to gravity is always the same at every point on the surface of the Earth.
The acceleration due to gravity is always the same at every point on the surface of the Earth.
What is the force exerted by the Earth on 1 kg of mass placed on the surface of the Earth?
What is the force exerted by the Earth on 1 kg of mass placed on the surface of the Earth?
What is the acceleration of an aeroplane caused by the gravitational force exerted by the Earth, when the aeroplane is 10 km above the surface of the Earth?
What is the acceleration of an aeroplane caused by the gravitational force exerted by the Earth, when the aeroplane is 10 km above the surface of the Earth?
The force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
The force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
The weight of an object is always the same, regardless of its position on the Earth.
The weight of an object is always the same, regardless of its position on the Earth.
When an object is allowed to fall freely from a height, it will fall to the ground only under the gravitational force of the Earth. This state of motion is called
When an object is allowed to fall freely from a height, it will fall to the ground only under the gravitational force of the Earth. This state of motion is called
A person experiences weightlessness when they are
A person experiences weightlessness when they are
The weight of an object will be zero when it is falling freely.
The weight of an object will be zero when it is falling freely.
A stone tied to a string is whirled around in a circle. It is in circular motion where the object moves with equal distance at equal intervals of time.
A stone tied to a string is whirled around in a circle. It is in circular motion where the object moves with equal distance at equal intervals of time.
What is the force responsible for making a stone whirl around in a circle?
What is the force responsible for making a stone whirl around in a circle?
In circular motion, the object will move in a straight line if the centripetal force is removed.
In circular motion, the object will move in a straight line if the centripetal force is removed.
The mass of an object changes as it moves from one place to another.
The mass of an object changes as it moves from one place to another.
The weight of an object changes as it moves from one place to another.
The weight of an object changes as it moves from one place to another.
Which of the following is not an example of circular motion?
Which of the following is not an example of circular motion?
Explain why large rockets are needed to launch satellites into space?
Explain why large rockets are needed to launch satellites into space?
The mass of an object does not change as it moves from the Earth to the Moon.
The mass of an object does not change as it moves from the Earth to the Moon.
The weight of an object remains the same as it moves from the Earth to the Moon.
The weight of an object remains the same as it moves from the Earth to the Moon.
What would be the weight of a 10 kg object on a planet that has twice the mass and three times the radius of the Earth?
What would be the weight of a 10 kg object on a planet that has twice the mass and three times the radius of the Earth?
The acceleration due to gravity, denoted by 'g', is independent of the mass of the object.
The acceleration due to gravity, denoted by 'g', is independent of the mass of the object.
The acceleration due to gravity is the same at all points on the surface of the Earth.
The acceleration due to gravity is the same at all points on the surface of the Earth.
An object will experience weightlessness when it is falling freely.
An object will experience weightlessness when it is falling freely.
Flashcards
Physics
Physics
The natural science that involves the study of matter, its motion and behavior through space and time, and related concepts such as energy and force.
Standard IX
Standard IX
The ninth grade level of education.
Kerala
Kerala
A state in southern India.
State Council of Educational Research and Training(SCERT)
State Council of Educational Research and Training(SCERT)
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Textbook Development Committee
Textbook Development Committee
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National Anthem
National Anthem
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Study Notes
Physics Standard IX, Part 1
- This is a textbook for Standard IX Physics, Part 1, prepared by SCERT Kerala, 2024.
- The book aims to help students understand basic physics concepts, apply them in real-life, and counter superstitions.
- It includes activities, visuals, and questions to encourage active learning.
- The book covers topics like Refraction of Light, Equations of Motion, Laws of Motion, and Gravitation.
- Each section has specific activities and figures for enhanced learning.
Contents
- Refraction of Light (page 7)
- Equations of Motion (page 27)
- Laws of Motion (page 53)
- Gravitation (page 73)
Textbook Development Committee
- Includes advisors, chairpersons, experts, writers, and artists involved in creating the textbook.
- Lists specific individuals and their roles in the committee.
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