Potential Energy

Energy is defined as the ability to do work
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Questions #: 8
Time: 10 minutes
Pass Score: 80.0%
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________ is defined as the ability to do work

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Types of energy include

Electrical
Heat
Nuclear
Time
Kinetic
Potential
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Potential energy

It is the energy - the ability to do work - stored in an object because of its position.

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Gravitational potential energy or kinetic energy?

A weight that is high above your head can be made to exert a force when it falls.  This is a type of

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Pendulum

 

pendulum.gif

Consider the pendulum in the figure.  Release it.  When the pendulum hits the shoe, it will push the shoe forward, exerting a force on the shoe over a distance.  if we were to multiply the force exerted on the shoe by the distance the shoe moves, we could calculate the amount of work that is done.

The pendulum had the ability to do work on the shoe because when the pendulum was at the raised position it had what type of energy?

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Understanding potential energy

An object at a given has an amount of potential energy (PE) that is equal to the done in raising it to that .  Or, since the to lift an object is equal to the object's

drag and drop the selected option to the right place or type it instead
work
weight
height
force
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Consider an 8-newton object that is 2 meters above the floor

  1. What is its potential energy with reference to the floor? joules
  2. How much work can it do when it falls? joules
  3. Suppose the object falls onto a marshmallow on the floor and mashes the marshmallow down 1 centimeter.  What force is exerted by the object on the marshmallow? N
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What is the potential energy with reference to the table?

Suppose that a 5-kg object rests on a table.  You lift it up to the ceiling, which is 2 meters above the table.  What is its potential energy with reference to the table?

PE = joules

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Explanation

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