An object can possess kinetic energy , the energy of motion, and/or potential en

Question

An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. Energy can be transferred in many ways, one of which is in the form of work. Work, w , is the energy transferred when an object is caused to move a distance, d , against a force, F . Mathematically, we would write this as

w=Fd

Force is the product of mass, m , and acceleration, a :

F=ma

When the acceleration is due to gravity, the symbol g is used instead of a , and its value is g = 9.81 ms 2   .

How much work is done when a 115 g tomato is lifted 10.4 m ?

Explanation / Answer

Answer –

We are given, mass tomato = 115 g and distance = 10.4 m

We also given, a = 9.81m.s-2

First we need to convert mass of tomato from g to kg

We know

1 g = 0.001 kg

So, 115 g = ?

= 0.115 kg

Now we need to calculate the force –

We are given formula,

F = m*a

= 0.115 kg * 9.81m.s-2

= 1.128 N     ( 1N = kg* m.s-2)

Now we calculated force and we also given distance, so work done is

w = F * d

    = 1.128 N * 10.4 m

    = 11.7 J

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