Physics

Grade-8

Easy

Question

# Mathematically state law of conservation of momentum.

Hint:

### For any collision occurring in an isolated system, momentum is conserved.

## The correct answer is:

- For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.
- The formula for the law of conservation of momentum is: m 1 u 1 + m 2 u 2 = m 1 v 1 + m 2 v 2.

### Related Questions to study

Physics

### Mathematically represent, “The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision, provided there is no external unbalanced force acting on them.”

### Mathematically represent, “The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision, provided there is no external unbalanced force acting on them.”

PhysicsGrade-8

Physics

### “The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision provided there is no external unbalanced force acting on them.” This statement belongs to:

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

### “The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision provided there is no external unbalanced force acting on them.” This statement belongs to:

PhysicsGrade-8

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

Physics

### A book is kept on a table. Gravity acts on the book and pushes it down. But the book does not go down. Why?

- An equal and opposite force is exerted by the table.
- An unequal and opposite force is exerted by the table.
- An equal force is exerted by the table.
- An opposite force is exerted by the table.

### A book is kept on a table. Gravity acts on the book and pushes it down. But the book does not go down. Why?

PhysicsGrade-8

- An equal and opposite force is exerted by the table.
- An unequal and opposite force is exerted by the table.
- An equal force is exerted by the table.
- An opposite force is exerted by the table.

Physics

### A book is kept on a table. Newton’s third law applies here.

- True
- False

### A book is kept on a table. Newton’s third law applies here.

PhysicsGrade-8

- True
- False

Physics

### “A ball falls on the ground and it bounces. Newtons third law applies on it.” Is the statement true or false?

- True
- False

### “A ball falls on the ground and it bounces. Newtons third law applies on it.” Is the statement true or false?

PhysicsGrade-8

- True
- False

Physics

### A man is playing with a ball. The force applied by the man on the ball is F1. The force applied by the ball on the man is F2. Which of the following is true?

- F1 > F2
- F1 < F2
- F1 = F2
- 2 F1 = F2

### A man is playing with a ball. The force applied by the man on the ball is F1. The force applied by the ball on the man is F2. Which of the following is true?

PhysicsGrade-8

- F1 > F2
- F1 < F2
- F1 = F2
- 2 F1 = F2

Physics

### A bus with a mass of 2500 Kg travelling with an acceleration of 2 m/s^{2} hits a light pole. What force does the bus experience?

- 5000 N
- 1250 N
- 1/5000 N
- 1/1250 N

### A bus with a mass of 2500 Kg travelling with an acceleration of 2 m/s^{2} hits a light pole. What force does the bus experience?

PhysicsGrade-8

- 5000 N
- 1250 N
- 1/5000 N
- 1/1250 N

Physics

### A driver hits a tree with a force of 20N. what force does the car experience?

- 20 N
- 200 N
- 0.2 N
- 2 N

### A driver hits a tree with a force of 20N. what force does the car experience?

PhysicsGrade-8

- 20 N
- 200 N
- 0.2 N
- 2 N

Physics

### A football player hits a ball with a force of 25 N. What force does the ball experience?

- 25 N
- 1/25 N
- 7 N
- 3 N

### A football player hits a ball with a force of 25 N. What force does the ball experience?

PhysicsGrade-8

- 25 N
- 1/25 N
- 7 N
- 3 N

Physics

### A person is moving forward while swimming by applying backward force on the water. What is the action force?

- Backward force on the water.
- Forward force on water.
- Person moving forward.
- Person moving backward.

### A person is moving forward while swimming by applying backward force on the water. What is the action force?

PhysicsGrade-8

- Backward force on the water.
- Forward force on water.
- Person moving forward.
- Person moving backward.

Physics

### Observe the image. Which law diagrammatically say this?

- Newton’s first law of motion.
- Newton’s second law of motion.
- Newton’s third law of motion.
- Newton’s fourth law of motion.

### Observe the image. Which law diagrammatically say this?

PhysicsGrade-8

- Newton’s first law of motion.
- Newton’s second law of motion.
- Newton’s third law of motion.
- Newton’s fourth law of motion.

Physics

### An inflated balloon’s mouth is tied with a thread. The thread is let loose. Newtons third law applies on it. Is the statement true or false?

- True
- False

### An inflated balloon’s mouth is tied with a thread. The thread is let loose. Newtons third law applies on it. Is the statement true or false?

PhysicsGrade-8

- True
- False

Physics

### A man pushes the wheel of his wheelchair with his hands. Newtons third law applies on it. Is the statement true or false?

- True
- False

### A man pushes the wheel of his wheelchair with his hands. Newtons third law applies on it. Is the statement true or false?

PhysicsGrade-8

- True
- False

Physics

### A girl is swinging on a to and fro swing. Newtons third law does not apply on it. Is the statement true or false?

- True
- False

### A girl is swinging on a to and fro swing. Newtons third law does not apply on it. Is the statement true or false?

PhysicsGrade-8

- True
- False

Physics

### Moon orbiting the Earth. Newtons third law act on it. Is the statement true or false?

- True
- False

### Moon orbiting the Earth. Newtons third law act on it. Is the statement true or false?

PhysicsGrade-8

- True
- False