Question

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(a) What is transformation of energy? Explain with any two suitable examples.

(b) What must be the velocity of a moving body of mass 2kg so that its KE is 25J?

(c) Represent graphically a constant force acting on a body producing a displacement along the direction of motion on a force - displacement graph.

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Answer 1

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† Answer (a) †

The transformation of energy means the conversation of energy.

In simple words we can say transformation of energy means conversion from one form to another.

What can be these forms?

Some of them are :-

• Kinetic Energy
• Potential Energy
• Electrical Energy
• Chemical Energy
• Nuclear Energy
• Mechanical Energy

Examples :-

• When we run any fan, the electrical energy is converted into mechanical energy
• The Electric cell which are used in simple experiments, in this the chemical energy is converted into electrical energy.

† Answer (b) †

☆ Given ☆

• Mass (m) = 2 kg
• Kinetic Energy (K.E) = 25 J

☆ To Find ☆

• Velocity (v)

☆ Formula Used ☆

• $\pink{\underline{\boxed{\rm \dfrac{1}{2} \times m \times v^{2} }}}$

➥ $\rm 25 = \dfrac{1}{2} \times 2 \times v^{2}$

➥ $\rm 25 = 1 \times v^{2}$

➥ $\rm 25 = v^{2}$

➥ $\rm v^{2} =25$

➥ $\rm v = \sqrt{25}$

➥ $\rm v = 5$

Thus, the velocity is 5 m/s².

† Answer (c) †

Graphical representation of a constant force acting on a body producing a displacement along the direction of motion on a force - displacement graph is given :-

$\setlength{\unitlength}{1 cm}\begin{picture}(12,8)\put(0,0){\line(1,0){5}}\put(-0.9,0){ \sf (0,0) }</p><p>\put(0,6){\line(0,-1){6}}\put(0,5){\vector(0,1){1}}\put(4,0){\vector(1,0){1}}\put(4.5,3){\line(-1,0){4.5}}\put(4.4,-0.3){ \bf s }\put(3.2,-0.3){\vector(1,0){1}}\put(-0.4,3.1){ \sf f }\put(-0.3,2){\vector(0,1){1}}\put(0.2,5.9){ \sf F(N) }\put(4.8,-0.3){ \sf s(m) }\put(4.5,0){\line(0,1){0.2}}\put(4.5,0.3){\line(0,1){0.2}}\put(4.5,0.6){\line(0,1){0.2}}\put(4.5,0.9){\line(0,1){0.2}}\put(4.5,1.2){\line(0,1){0.2}}\put(4.5,1.5){\line(0,1){0.2}}\put(4.5,1.8){\line(0,1){0.2}}\put(4.5,2.1){\line(0,1){0.2}}\put(4.5,2.4){\line(0,1){0.2}}\put(4.5,2.7){\line(0,1){0.2}}\end{picture}$

Answer 2

Answer:

The transformation of energy means the conversation of energy..........

For example of energy:-Kinetic energy