Energy and Momentum: Master the Fundamentals of Motion

Question 1

A 2 kg object falls freely from a height of 5 meters. What is its kinetic energy just before it hits the ground?

Accepted Answer

98 J

Answer

10 J

Answer

20 J

Answer

40 J

Question 2

In an isolated system, which of the following is not a conserved quantity?

Accepted Answer

Speed

Answer

Energy

Answer

Momentum

Answer

Angular momentum

Question 3

Which of the following factors does not influence the period of a pendulum?

Accepted Answer

Amplitude of the swing

Answer

Length of the pendulum

Answer

Mass of the bob

Answer

Gravitational acceleration

Question 4

What is the SI unit of impulse?

Accepted Answer

Newton

Answer

Joule

Answer

Pascal

Answer

Watt

Question 5

A figure skater, initially spinning slowly with arms outstretched, pulls their arms inward. What happens to their rotational kinetic energy?

Accepted Answer

Decreases

Answer

Increases

Answer

Stays the same

Answer

Cannot be determined

Question 6

In an elastic head-on collision, a ball of mass 'm' moving at speed 'v' strikes a stationary ball of mass '2m'. What fraction of the original kinetic energy is transferred to the stationary ball?

Accepted Answer

1/2

Answer

0

Answer

1

Answer

2

Question 7

In an isolated system, which physical quantity remains constant?

Accepted Answer

Total mechanical energy

Answer

Kinetic energy

Answer

Potential energy

Answer

Total momentum

Question 8

Which of the following is not classified as a type of mechanical energy?

Accepted Answer

Thermal energy

Answer

Kinetic energy

Answer

Potential energy

Answer

Elastic energy

Question 9

The kinetic energy of an object is directly proportional to its:

Accepted Answer

Velocity squared

Answer

Mass

Answer

Acceleration

Answer

Displacement

Question 10

In an elastic collision, which physical quantities are conserved?

Accepted Answer

Both total kinetic energy and total momentum

Answer

Total kinetic energy only

Answer

Total momentum only

Answer

Neither total kinetic energy nor total momentum

Question 11

A rocket engine operates based on the principle of:

Accepted Answer

Conservation of momentum

Answer

Conservation of energy

Answer

Conservation of angular momentum

Answer

Conservation of mass

Question 12

The energy possessed by a vibrating spring is:

Accepted Answer

Both kinetic and potential energy

Answer

Kinetic energy only

Answer

Potential energy only

Answer

Neither kinetic nor potential energy

Question 13

Which SI unit is employed to quantify momentum?

Accepted Answer

Kilogram-meter per second

Answer

Joule

Answer

Newton-meter

Answer

Watt

Question 14

Calculate the kinetic energy of a 0.5 kg ball moving at 5 m/s.

Accepted Answer

1.25 J

Answer

0.5 J

Answer

2.5 J

Answer

5 J

Question 15

Which type of collision conserves kinetic energy?

Accepted Answer

Elastic collision

Answer

Inelastic collision

Answer

Perfectly inelastic collision

Answer

Superelastic collision

Question 16

A moving object with a certain momentum is brought to rest. The change in its momentum is:

Accepted Answer

Equal to its initial momentum but in the opposite direction

Answer

Equal to twice its initial momentum in the opposite direction

Answer

Zero

Answer

Equal to half of its initial momentum in the opposite direction

Question 17

Which of the following statements about energy is correct?

Accepted Answer

Energy can be transferred from one form to another.

Answer

Energy can be created or destroyed.

Answer

The total amount of energy in the universe is constantly decreasing.

Answer

Energy has mass.

Question 18

A ball is thrown vertically upward with a velocity of 10 m/s. What is its velocity at the highest point of its trajectory?

Accepted Answer

0 m/s

Answer

5 m/s

Answer

10 m/s

Answer

15 m/s

Question 19

Which of the following is the SI unit of momentum?

Accepted Answer

kg m/s

Answer

kg

Answer

N

Answer

J

Question 20

A ball of mass 0.5 kg is moving with a velocity of 10 m/s. What is the ball's momentum?

Accepted Answer

5 kg m/s

Answer

10 kg m/s

Answer

15 kg m/s

Answer

20 kg m/s