Tag: renewable and non-renewable sources of energy

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Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

A body rolling down a hill has

  1. K.E. only

  2. P.E. only

  3. Neither K.E. nor P.E

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While rolling down from hill a body will have some Potential energy due to height wrt to ground and due to rolling it will have some Kinetic energy .As it will keep rolling down , Its PE will change into KE

So $E _{Total}=mgh+\dfrac{mv^2}{2}$

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

A flying aeroplane has:

  1. only potential energy

  2. only kinetic energy

  3. both potential and kinetic energy

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An flying aeroplane required some work to be done against gravity to go upto that much height that work will be stored as potential energy of the body. Also aeroplane has some mass and moving with some velocity so has some kinetic energy also. 

So this poses both potential as well as kinetic energy.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

A body rolling down a hill has:

  1. K.E. only

  2. P.E. onley

  3. neither K.E. and P.E.

  4. both K.E and P.E
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Taking toe of the hill as refrence point so some work against the gravity is done to raise the body to top of the hill so it poses some potential energy equal to mgh where m is mass and g is acceleration due to gravity and h is vertical height.

Also he is moving so he must have some kinetic energy.
So body rolling along the hill have both kinetic as well as potential energy.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

Which of the following has both kinetic energy and potential energy ?

  1. A flying bird

  2. A bent bow about to shoot an arrow

  3. An athlete running at full speed

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

Since the bird is flying is must be at some distance from the ground and Potential energy is present when there is some height associated with that object (Since P.E = mgh). Also  the bird has mass and thus gravity will be acted on it. Kinetic energy is present for an object if it has velocity.This a flying bird has both kinetic energy and potential energy.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

Identify an example of kinetic mechanical energy?

  1. A loaded gun

  2. A set mouse trap

  3. An elevated wrecking ball

  4. A compressed spring

  5. A bike rolling down a hill
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A loaded gun, a set mouse trap and a compressed spring are examples of elastic potential energy.

An elevated wrecking ball is an example of gravitational potential energy.
A bike rolling down a hill is an example of kinetic energy, where potential energy is constantly converting in the kinetic energy of the bike as given by $\dfrac{1}{2}mv^2$.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

Select the best definition of mechanical energy?

  1. Energy possessed by an object due to its location or motion

  2. Energy possessed by an object due to its temperature

  3. Energy possessed by an object due to its magnetic property

  4. Energy of an object due to its concentration

  5. Energy possessed by an object due to its age
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy(energy of motion) or potential energy (stored energy of position). 

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

What is the relationship between the kinetic energy($K$), potential energy($P$) and total energy($E$) of a system?

  1. $K=P+E$
  2. $E=P+K$
  3. $P=K+E$
  4. $E=PK$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total mechanical energy of the system is equal to the sum of kinetic energy of the system and the potential energy of the system.

Thus, total mechanical energy  $E = K+P$