Question

# According to the law of conservation of energy:

- Energy can't be destroyed.
- Energy can't be created.
- Energy can be transformed from one form to another
- All the above

Hint:

### This law is derived from the **first law of thermodynamics. **

## The correct answer is: All the above

### According to the law of conservation of energy: All of the above statements are true.

- Energy can't be created, Energy can be transformed from one form to another, and Energy can't be destroyed.
- Energy conservation law specifies that energy can neither be generated nor wasted- it can only be transferred from one source of energy to another/ one form to other.
- Which means whether it is applied from the outside, a system still has the same amount of energy.

### Related Questions to study

### The form of energy possessed by a flying bird is:

### The form of energy possessed by a flying bird is:

### What kind of energy is present in a rotating wheel?

### What kind of energy is present in a rotating wheel?

### When an object falls freely towards the earth, then its total energy:

### When an object falls freely towards the earth, then its total energy:

### The person will have maximum Potential Energy; when?

With an increase in its height the potential energy increases.

### The person will have maximum Potential Energy; when?

With an increase in its height the potential energy increases.

### Read the statements and mark the correct option.

Statement 1: The acceleration due to the gravity of earth does not depend upon the body's mass.

Statement 2: Acceleration due to gravity remains constant.

### Read the statements and mark the correct option.

Statement 1: The acceleration due to the gravity of earth does not depend upon the body's mass.

Statement 2: Acceleration due to gravity remains constant.

### If the mass of a body on the moon is 50 kg, what is its weight on the earth?

### If the mass of a body on the moon is 50 kg, what is its weight on the earth?

### What is the mass of a body whose weight is 49 newtons?

The correct option is d)5 kg.

The weight of the body = 49 N

Weight of body = mass of body x gravity

49= mass x 9.8

mass = 49/9.8 = 5 Kg

### What is the mass of a body whose weight is 49 newtons?

The correct option is d)5 kg.

The weight of the body = 49 N

Weight of body = mass of body x gravity

49= mass x 9.8

mass = 49/9.8 = 5 Kg

### The value of 'g'.

### The value of 'g'.

### Two objects of different masses falling freely near the surface of the earth would:

The correct option is** a)Have same velocities at any instant.**

In free fall, velocity depends only on acceleration due to gravity. Acceleration due to gravity is independent of the mass of the object. Therefore, the gravitational pull of the moon applies the same acceleration to both objects. Therefore, it will always have the same velocity regardless of mass. The force depends on the mass, and since the bodies have different masses here, no two will experience the same force.

### Two objects of different masses falling freely near the surface of the earth would:

The correct option is** a)Have same velocities at any instant.**

In free fall, velocity depends only on acceleration due to gravity. Acceleration due to gravity is independent of the mass of the object. Therefore, the gravitational pull of the moon applies the same acceleration to both objects. Therefore, it will always have the same velocity regardless of mass. The force depends on the mass, and since the bodies have different masses here, no two will experience the same force.

### The value of gravitational acceleration is:

### The value of gravitational acceleration is:

### Calculate the force of gravitation due to earth on a man of mass 100 kg standing on the ground.

### Calculate the force of gravitation due to earth on a man of mass 100 kg standing on the ground.

### Why does the earth not seem to move towards an apple falling towards it?

The correct option is **c)The acceleration gained by the earth is not sufficient for its motion to be apparent.**

Acceleration is inversely proportional to mass, so gravitational acceleration can be ignored.

The apple falls to the earth, but the earth does not move towards the apple because acceleration is inversely proportional to mass. The Earth's mass is very large compared to the apple, so the acceleration towards the apple is negligible.

### Why does the earth not seem to move towards an apple falling towards it?

The correct option is **c)The acceleration gained by the earth is not sufficient for its motion to be apparent.**

Acceleration is inversely proportional to mass, so gravitational acceleration can be ignored.

The apple falls to the earth, but the earth does not move towards the apple because acceleration is inversely proportional to mass. The Earth's mass is very large compared to the apple, so the acceleration towards the apple is negligible.

### The pull exerted by the Earth on a body of mass 1 kg is ___ N.

The correct option is c)9.8.

From Newton's law of universal gravitation, we know that the gravitational force between objects is given by the following formula:

$Mass of earth=M= 6.0×10kg$

$m=1kg$

$R= 6.4 x 106$

$G= 6.67 x 10-11 Nm2 /kg$

$Substituting the values we get,$

$F=9.8 N$

### The pull exerted by the Earth on a body of mass 1 kg is ___ N.

The correct option is c)9.8.

From Newton's law of universal gravitation, we know that the gravitational force between objects is given by the following formula:

$Mass of earth=M= 6.0×10kg$

$m=1kg$

$R= 6.4 x 106$

$G= 6.67 x 10-11 Nm2 /kg$

$Substituting the values we get,$

$F=9.8 N$

### Gravitational force attracts the earth and the moon to each other. The earth attracts the moon with the following force:

The correct option is b)Same as that exerted by the moon.

Let m and M be the masses of the moon and the earth separated by a distance r.

Force of attraction that earth exert on moon=

Force of attraction that moon exert on earth=

This shows that they both exert same pressure on each other.

### Gravitational force attracts the earth and the moon to each other. The earth attracts the moon with the following force:

The correct option is b)Same as that exerted by the moon.

Let m and M be the masses of the moon and the earth separated by a distance r.

Force of attraction that earth exert on moon=

Force of attraction that moon exert on earth=

This shows that they both exert same pressure on each other.