A Log of Wood Cut by a Saw Becomes Hot. from Where Does this Heat Energy Come? - Physics

A log of wood cut by a saw becomes hot. From where does this heat energy come?

One Line Answer

This heat energy comes from the mechanical energy.

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Chapter 1: Force, Work, Energy and Power - Exercise 1.5 ii [Page 54]

Chapter 1 Force, Work, Energy and Power
Exercise 1.5 ii | Q 23 | Page 54

Fill in the blank

An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.

Define the term kinetic energy. Give one example of a body which possesses kinetic energy.

Name three non-renewable sources of energy.

Name two examples in which the mechanical energy of a system remains constant.

Name the energy changes for each of the following cases:
dynamo

Calculate the decrease in the kinetic energy of a moving body if its velocity reduces to half of the initial velocity.

State the energy changes which take place when:

A body thrown vertically upwards from the ground.

State the energy transformation on the following:

Electricity obtained from hydro energy.

Give one example when:

Light energy changes to chemical energy.

Obtain an expression for the kinetic energy of a body of mass m moving with a velocity v?