Kinetic Energy

Q.

Can K.E. of a system be increased or decreased without applying any external force on the system?

Q.

Derive an expression for potential energy.

Q. Calculate the force component in the direction of displacement.

1. 200 N
2. 100 N
3. 50 N
4. 150 N

Q.

Which form of energy does the flowing water possess?

1. Electrical energy
2. Potential energy
3. Gravitational energy
4. Kinetic energy

Q.

When the speed of the body is doubled what is the change in its kinetic energy?

1. Kinetic energy becomes double to its initial kinetic energy.
2. Kinetic energy becomes four times to initial kinetic energy.
3. Kinetic energy becomes triple to its initial kinetic energy.
4. Kinetic energy can not be determined.

Q. A body of mass 10 kg is moving with a velocity of $5m/s$. What is the work to be done to bring the body to rest?

1. 125 J
2. 225 J
3. - 125 J
4. - 225 J

Q. What is the definition for MECHANICAL ENERGY?

Q.

A moving body weighing 400N possess 500J of kinetic energy. Calculate the velocity with which the body is moving (g=10m/s2)

Q. A body of $5kg$ has momentum of $10kgm/s$. Its kinetic energy is .

1. $10N/m^2$
2. $30J$
3. $10J$
4. $15J$

Q.

If a ball of mass 1 kg is falling from a height 10 m. What will be the kinetic energy of the ball when it hits the ground?( take g = 10 m/s²) and neglect air drag.

1. 100J

2. 50J

3. 10J

4. 0

Q.

Dimensions of impulse are the same as that of

1. force

2. momentum

3. energy

4. acceleration

Q.

What is kinetic energy at infinity?

Q.

imagine that you are jumping up and down on a trampoline

(a) name the store of energy when you are pressing downwards on the strretchy skin of the trampoline

(b) name the store of energy when you are high up in yhe air

Q.

Given that the kinetic energy of an object is $100J$. If the mass of an object is $2kg$ then find its speed.

Q.

What is kinetic energy in physics?

Q.

A bullet of mass $40g$ has its kinetic energy equal to $200J$. Then the speed of the bullet is___ $m{s}^{-1}$

Q. The ratio of kinetic energy require to be given to escape from Earth surface to kinetic energy require to be given to the same satellite to revolve round the earth in an orbit just above earth surface is

Q. The energy of a flying kite is kinetic energy.

1. False
2. True

Q. _____ is possessed by a simple pendulum when it is in the mean position

1. The sum of potnetial and kinetic energies
2. Sound energy
3. Potential energy
4. Kinetic energy

Q.

At what speed of a body of mass $1kg$ will have a kinetic energy of $1J$?

Q.

A car is moving with a speed of $15km{h}^{-1}$ and another identical car is moving with a speed of $30km{h}^{-1}$. Ratio of their kinetic energies will be :

1. 1 : 4

2. 3 : 4

3. 1 : 2

4. 2 : 1

Q.

Differentiate between Kinetic energy and potential energy

Q.

Find the kinetic energy of a ball of mass 500 gram moving with a velocity of 8 m/s

Q.

The SI unit of energy is same as that of work.

1. True
2. False

Q.

A 1kg block is lifted up in a vertical upward direction by 1m. The work done on the block is above [take g=10 m/s²]

1. 1J

2. 5J

3. 10J

4. Zero

Q.

Difference Between kinetic and potential energy with 10 example of each one

Q.

What is the energy associated with motion called?

Q.

Find the work done for a displacement of 4 m from the following graph.

1. $0.5J$

2. $1.0J$

3. $3.0J$

4. $3.5J$

Q.

Calculate the weight of a boy of mass 50 kg on Earth's surface. (Use g = 10 m/s²)

1. 600 N

2. 700 N

3. 800 N

4. 500 N

Q. A body of mass 2 kg is moving with a constant velocity of $3m/s.$
Calculate the work done on the body.

1. 0 J
2. 12 J
3. 6J
4. - 6 J