Work and Energy | Grade 8 Science DepEd MELC-Based Quarter 1 Module 3 Part 1 Work
Summary
TLDRThis educational video explores the concept of 'work' in various contexts, from employment to physics. It explains that in physics, work is related to energy transfer, occurring when a force causes displacement in the direction of the force. The formula for calculating work (W = force × displacement) is introduced, with the unit of work being the joule, named after James Prescott Joule. The video also illustrates work with everyday examples like pushing a chair and rolling a ball, emphasizing the energy transfer involved in these actions.
Takeaways
- 🔧 The term 'work' has various meanings, including a job or employment, tasks or activities to be accomplished, and an abstract concept in physics related to energy.
- 🏢 When asked where you work, it typically refers to your job or place of employment.
- 📚 In an educational context, 'work' refers to tasks or activities like homework that need to be completed.
- 🔨 In physics, work is associated with energy and involves a change in energy when it is done.
- 🚶♂️ Work is done by an object when it loses energy, and work is done on an object when it gains energy.
- 📐 For work to be done on an object, a force must be applied and the object must move in the direction of the force.
- 📏 The formula to calculate work is Work = Force × Displacement, where the unit of work is the joule (newton meter).
- 👨🔬 The unit 'joule' is named after the English physicist James Prescott Joule and is also a unit of energy.
- 🛠️ An example calculation of work involves pushing a chair with a force of 500 newtons over a displacement of 7 meters, resulting in 3500 joules of work done.
- 🎳 In the provided bowling game example, work is done on the ball when it is pushed, transferring energy to it, which then moves as kinetic energy.
- 🧠 The script encourages viewers to keep their minds busy and to subscribe for more educational content.
Q & A
What is the general meaning of the word 'work' in everyday language?
-In everyday language, 'work' often refers to a job or employment, or to tasks or activities that need to be accomplished, such as homework.
How is 'work' defined in physics?
-In physics, 'work' is defined as the process in which energy is transferred to or from an object when a force is applied, causing displacement in the direction of the force.
What must happen for work to be considered as done on an object?
-For work to be considered as done on an object, a force must be applied to the object, and the object must move in the direction of the applied force.
What is the formula used to calculate work done by a force?
-The formula to calculate work is: Work = Force × Displacement.
What are the units of force and displacement in the work formula?
-The unit of force is the newton (N), and the unit of displacement is the meter (m).
What is the unit of work, and who is it named after?
-The unit of work is the joule (J), named after the English physicist James Prescott Joule.
How much work is done if a 500 newton force pushes a chair 7 meters?
-The work done is 3,500 joules, calculated by multiplying the force (500 newtons) by the displacement (7 meters).
In the example of rolling a ball to hit bottles, is work done on the ball, and why?
-Yes, work is done on the ball because the force exerted on it causes the ball to move in the same direction as the force applied.
What is the relationship between force, work, and energy as described in the script?
-The force applied to an object does work on the object, and this work results in a transfer of energy to the object, often causing it to move.
What key concept is emphasized about the direction of force and displacement in the context of work?
-The key concept emphasized is that for work to be done, the force applied must cause displacement in the same direction as the force.
Outlines
🔧 Understanding Work in Different Contexts
This paragraph introduces the concept of 'work' in various contexts, from employment and tasks to the abstract idea in physics related to energy. It explains that work involves a force applied to an object that results in movement in the direction of the force, and no work is done if there's no movement or if the movement is in a different direction. The paragraph also introduces the formula for calculating work (Work = Force × Displacement) and the unit of measurement, the joule, named after James Prescott Joule. An example calculation is provided, illustrating how much work is done when pushing a chair with a force of 500 newtons over a distance of 7 meters, which equals 3500 joules.
🏀 The Role of Work and Energy in Motion
The second paragraph delves into the concept of work in the context of motion and energy. It uses the example of pushing a ball to hit objects, explaining that work is done when the force exerted is in the same direction as the ball's motion, transferring energy to the ball. This energy then becomes the ball's kinetic energy, allowing it to continue moving even after the initial push. The paragraph concludes by emphasizing the importance of understanding that work results in displacement in the direction of the applied force and encourages viewers to stay curious and engaged with the content.
Mindmap
Keywords
💡Work
💡Employment
💡Homework
💡Physics
💡Energy
💡Force
💡Displacement
💡Newton
💡Joule
💡Motion
💡Activity
Highlights
The word 'work' has multiple meanings and can refer to employment, tasks, or an abstract concept in physics related to energy.
In physics, work is done when there is a change in energy associated with the movement of an object due to a force.
For work to be done, a force must be applied to an object, and the object must move in the direction of the applied force.
No work is done if the force exerted does not result in movement of the object or if the movement is in a different direction from the force.
The formula for calculating work is work equals force times displacement, represented by the symbol W.
The unit of force is the newton, and the unit of displacement is the meter, making the unit of work the newton meter, also known as a joule.
The joule is named after the English physicist James Prescott Joule and is a unit of energy.
One joule is the amount of work done or energy expended when a force of one newton is applied through a distance of one meter.
An example calculation of work done is pushing a chair with a 500 newton force along a seven-meter aisle, resulting in 3500 joules of work.
Work is done on an object when the force applied causes displacement in the same direction as the force.
The video suggests a simple activity to demonstrate work: playing a bowling game with a ball and plastic bottles to understand the concept of work.
When you push a ball, you do work on it by transferring energy, which then becomes the ball's kinetic energy.
The video emphasizes the importance of understanding the concept of work in physics as it relates to energy and force.
The video concludes by summarizing the conditions under which work is done: force applied causing displacement in the same direction.
The video encourages viewers to subscribe to the channel and turn on notifications for more educational content.
Transcripts
[Music]
what comes to mind when you hear the
word
work the word work has many meanings
[Music]
when people ask where do you work they
refer
to a job or employment
when your teacher asks have you done
your homework
they refer to the tasks or activity you
need to accomplish
in physics work is an abstract idea
related to energy
when work is done it is accompanied by a
change in energy
when work is done by an object it loses
energy
and when work is done on an object it
gains energy
by the way if you still haven't watched
our previous lessons
you can pause this video and watch it
first so you can easily understand a
lesson here
in the previous lessons we learned that
force can change the state of motion of
an object
if an object is at rest it can be moved
by
exerting force on it
if an object is moving it can be made to
move faster or stopped by applying force
on it
in order to say that work is done
on an object there must be force applied
to it
and the object moves in the direction
of the force applied
work is done if the object you push
moves a distance in the direction
towards which you are pushing it
no work is done if the force you exert
does not make the object move
[Music]
no work is also done if the object moves
a distance
in a direction that is not in the
direction
of the fourth supply take this man for
example
the force he uses to carry the backpack
is upwards
but he is moving in a different
direction from the force applied
work is done when the force applied to
the object
causes the object to have a displacement
in the same direction as the force
applied
the symbol for work is a capital w
the work done by a force can be
calculated using this formula
work equals to force times displacement
as we have learned in the previous
module the unit of force
is kilogram meter per second squared
or newton and the unit of displacement
is meter hence the unit for work
is the unit of force times the unit of
displacement
or newton meter otherwise known as joule
[Music]
the unit joule is named after the
english physicist
james prescott joel this is also a unit
of energy
one joule is equal to the work done or
energy expended in applying a force of
one newton through a distance of one
meter
let's try calculating for work done
suppose you are pushing a chair
with a 500 newton force along a seven
meter aisle
how much work is done in pushing the
chair
from one end of the aisle to the other
so we have the formula
work is equal to force times
displacement
the given force is 500 newton and
the displacement is 7 meters so the work
done
is 500 newton times 7 meters
which is equal to 3 500 newton meters
or 3 500 joules
try doing this simple activity play a
bowling game
roll a plastic or rubber ball along the
floor to hit some empty plastic bottles
or bowling pins
is there work done in the ball what can
a moving ball do the answer is yes
you have done work on the ball the force
you exerted
in pushing the ball is in the same
direction as the motion of the ball
but then you did not continuously push
the ball
until it hit the empty bottles or
bowling pins
you just gave it a nudge and then it
rolled forward
the force exerted on the ball changed
the ball's motion
something was transferred to the ball
causing it to move continuously
that something is called energy
the energy became the motion energy of
the ball
now let's wrap things up work is done
when the force applied to the object
causes the object to have a displacement
in the same direction as the force
applied
that's all for now see you on our next
video
and don't forget to keep your minds busy
if you like this video please subscribe
to our channel
and hit the notification icon for more
videos like this
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