मराठी

What are the two kinds of mechanical energy?

Advertisements
Advertisements

प्रश्न

What are the two kinds of mechanical energy?

What are the two forms of mechanical energy?

एका वाक्यात उत्तर
Advertisements

उत्तर

Two kinds/forms of mechanical energy:

  1. The Potential Energy (P.E.)
  2. The Kinetic Energy (K.E.)
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Energy - Short/Long Answer questions [पृष्ठ ७७]

APPEARS IN

एस.एस. शोम Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Short/Long Answer questions | Q 14 | पृष्ठ ७७
एस.एस. शोम Concise Physics [English] Class 7 ICSE
पाठ 3 Energy
Short/Long Answer Questions | Q 4
सेलिना Concise Physics [English] Class 10 ICSE
पाठ 2 Work, Energy and Power
EXERCISE - 2(B) | Q 1. | पृष्ठ ४०

संबंधित प्रश्‍न

What do you mean by degradation of energy?


How much work is done when a body of mass m is raised to a height h above the ground?


Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?


Complete the following sentences:

Kilowatt is the unit of ....... and kWh is the unit of


What is the relation between 1 H.P. and 1 kW?

Define potential energy.

Define the unit 'watt'. How is it related to horse power?

A body does 20 J of work in 10 s. What is its power?


A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.


A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.


Give an example 
Chemical energy changes to heat energy.


A bullet of mass 25 g has a velocity of 600 ms-1. What is the kinetic energy of the bullet? If it penetrates 50 cm into a target, find the resistive force offered by the target.

A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?


Define Translational motion.


Is power a scalar or a vector quantity?


A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)

(ii) How much energy would be required in lifting the drum into the truck without the plank?

(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?

(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.

(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?


What is work?


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

An engine is pulling a train.


A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?


State whether work is done or not, by writing yes or no, in the following case:

A man pushes a wall.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×