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Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Potential energy is classified into which two energy?

  1. Gravitational and Elastic Potential Energy

  2. Kinetic and Elastic Potential Energy

  3. Mechanical and Elastic Potential Energy

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gravitational and Elastic Potential Energy are two types of potential energy

Gravitational potential energy: Energy stored in the object at a certain height above ground.
Elastic potential energy:Energy stored in streched or compressed spring.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Identify, which of the following energies can be positive only:

  1. Kinetic energy

  2. Potential energy

  3. Mechanical energy

  4. Both kinetic and mechanical energies.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potential energy is the energy stored by the virtue of the position of a body.While,kinetic energy is the energy possessed by the virtue of motion.
Hence, K.E is always +ve .
When a body is raised to a particular height,work is done against the force of gravity and P.E is $ - $ve.
When the body is falling freely the work is done in the direction of force of gravity and P.E is $+$ ve.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

Identify, which of the following energies can be positive only

  1. kinetic energy

  2. potential energy

  3. mechanical energy

  4. both kinetic and mechanical energies
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only kinetic energy can have positive value. Potential energy has negative value and mechanical energy is combination of these two hence can either be positive or negative.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

A small sphere is moving at a constant speed in a vertical circle. Below is a list of quantities that could be used to describe some aspect of the motion of the sphere.
$I$   -kinetic energy
$II$  -gravitational potential energy
$III$  - momentum
Which of these quantities will change as this sphere moves around the circle?

  1. $I$ and $II$ only
  2. $I$ and $III$ only
  3. $III$ only
  4. $II$ and $III$ only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Speed is given as constant. Though the velocity is changing only in direction, its magnitude remains the same. Thus the kinetic energy remains constant as it is a scalar quantity but momentum would change as it is a vector quantity.
Also as the elevation of the ball keeps on changing during the motion, the potential energy changes