Physics

Grade-10

Easy

Question

# “Newton’s first law of motion is used to derive Law of conservation of momentum.” Is the statement true or false?

- True
- False

Hint:

### Newton's second law is used to derive the law of conservation of momentum.

## The correct answer is 'False'.

### Newton's second law states that force=change in momentum/change in time. As force applied is zero in isolated system is zero, change in momentum is also zero. Hence momentum conservation comes from second law of motion and not first law.

### Related Questions to study

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### In a collision,

- Energy is lost always
- Momentum of the system remains constant
- Momentum is always transferred
- Momentum is always lost

### In a collision,

PhysicsGrade-10

- Energy is lost always
- Momentum of the system remains constant
- Momentum is always transferred
- Momentum is always lost

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### What is being depicted in the given image?

- Law of conservation of momentum
- Law of conservation of acceleration
- Law of conservation of velocity
- Law of conservation of mass

### What is being depicted in the given image?

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- Law of conservation of momentum
- Law of conservation of acceleration
- Law of conservation of velocity
- Law of conservation of mass

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### What is missing in this statement?

The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision.

The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision.

- No external unbalanced force is acting on it
- No internal balanced force is acting on it
- External balanced force is acting on it
- Internal unbalanced force is acting on it

### What is missing in this statement?

The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision.

The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision.

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- No external unbalanced force is acting on it
- No internal balanced force is acting on it
- External balanced force is acting on it
- Internal unbalanced force is acting on it

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### “The law of conservation of momentum is valid for all the moving objects colliding together irrespective of the direction they are moving in.”

Identify whether the statement is true or false.

- True
- False

### “The law of conservation of momentum is valid for all the moving objects colliding together irrespective of the direction they are moving in.”

Identify whether the statement is true or false.

PhysicsGrade-10

- True
- False

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### An object is moving at a uniform speed in a counter clockwise direction in a uniform circular motion. At the location shown, the centripetal force stops acting on the object. Which path will the object follow?

### An object is moving at a uniform speed in a counter clockwise direction in a uniform circular motion. At the location shown, the centripetal force stops acting on the object. Which path will the object follow?

PhysicsGrade-10

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### A boy is sitting in a merry-go-round. The time period of circular motion is 5 sec, and its speed of rotation is 70 m/s. What is the radius of the circle formed?

- 5.573 m
- 55.73 m
- 557.3 m
- 5573 m

### A boy is sitting in a merry-go-round. The time period of circular motion is 5 sec, and its speed of rotation is 70 m/s. What is the radius of the circle formed?

PhysicsGrade-10

- 5.573 m
- 55.73 m
- 557.3 m
- 5573 m

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### Richa is sitting in a merry-go-round. The time period of circular motion if it forms a circle of 56 m radius. The speed of rotation is 40 m/s.

- 2.8 pi s
- 280 pi s
- 0.14 pi s
- 28 pi s

### Richa is sitting in a merry-go-round. The time period of circular motion if it forms a circle of 56 m radius. The speed of rotation is 40 m/s.

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- 2.8 pi s
- 280 pi s
- 0.14 pi s
- 28 pi s

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### A girl is sitting in a merry-go-round. The time period of circular motion of the merry-go-round is 8 sec and it forms a circle of 40 m radius. What is the speed of rotation?

- 30.9 m/s
- 810.4 m/s
- 480.34 m/s
- 31.4 m/s

### A girl is sitting in a merry-go-round. The time period of circular motion of the merry-go-round is 8 sec and it forms a circle of 40 m radius. What is the speed of rotation?

PhysicsGrade-10

- 30.9 m/s
- 810.4 m/s
- 480.34 m/s
- 31.4 m/s

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### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point D

- Up
- Down
- Left
- Right

### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point D

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- Up
- Down
- Left
- Right

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### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point C

- Up
- Down
- Left
- Right

### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point C

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- Up
- Down
- Left
- Right

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### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point B

- Up
- Down
- Left
- Right

### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point B

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- Up
- Down
- Left
- Right

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### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point A

- Up
- Down
- Left
- Right

### What is the direction of the velocity at point mentioned if the ball is revolving anticlockwise?

At point A

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- Up
- Down
- Left
- Right

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### As the velocity of the object moving in a uniform circular motion increases, the time period _______.

- Increases
- Decreases
- Increases exponentially
- Decreases exponentially

### As the velocity of the object moving in a uniform circular motion increases, the time period _______.

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- Increases
- Decreases
- Increases exponentially
- Decreases exponentially

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### The time taken for one complete circle is called the _____.

- Time period
- Frequency
- Angular velocity
- Velocity

### The time taken for one complete circle is called the _____.

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- Time period
- Frequency
- Angular velocity
- Velocity

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### An object is moving at a uniform speed in a counterclockwise, horizontal circle. Which of the following images correctly depicts the force and velocity at a point in time?

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