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When a physics teacher knows his stuff !!

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I have here a pendulum I have an object

that weighs 15 kilograms and I can lift

it up one meter which I have done now

that means I've done work MGH is the

work I have done believe me

I've increased the potential energy of

this object 15 times 10 is about 150

joules if I let it fall then that will

be converted to kinetic energy if I

would let it swing from one meter height

and you would be there and it would hit

you you'd be dead 150 joules is enough

to kill you they use these devices to

call a wrecker ball they use them to

demolish buildings you lift up a very

heavy object even heavier than this and

then you let it go you swing it thereby

converting gravitational potential

energy into kinetic energy and that way

you can demolish a building you just let

it hit and it breaks a building and


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