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What is work
 is an abstract idea related to energy.
 when work is done it is accompanied by a
change in energy.
 a work is done when a force applied and
distance travelled by an object is the same
direction.
is the product of force and distance.
• W = Fd
where, F = Force (N)
d = distance (m)
A girl pushing a chair
A boy pushing a wall
A waiter carrying a tray
Calculating Work
Calculating Work
Given:
Force = 500 N
distance= 7 m
Work = ?
Solution:
Solve the following problems:
Work is a method of transferring energy
A ball and a plastic bottle
Work is a method of transferring energy
A ball and a plastic bottle
Is there a work done on the ball?
Work is a method of transferring energy
A ball and a plastic bottle
What can a moving ball do?
Work is a method of transferring energy
Solution: KE =
1
2
𝑚𝑣2
KE =
1
2
1000𝑘𝑔x(17𝑚/𝑠)2
KE =
1
2
1000𝑘𝑔x(289𝑚2
/𝑠2
)
KE =
1
2
289,000𝑘𝑔x(289𝑚2
/𝑠2
)
KE =
1
2
289,000𝑘𝑔 ∙ 𝑚2
/𝑠2
KE = 𝟏𝟒𝟒, 𝟓𝟎𝟎𝒌𝒈 ∙ 𝒎 𝟐
/𝒔 𝟐
Column B
___1. If you want to increase the
kinetic energy of an object,
you must increase its ____and
_____
___2. It is the ability to do work
___3. It means moving
___4. It is the energy of motion
___5. Energy is the ability to do ___.
a. Work
b. Energy
c. Kinetic Energy
d. mass and acceleration
e. kinetikos
A Man lifting a box
0.5 m
2 kg
Given: d = 0.5 m
g = 9.8
𝑚
𝑠2
m = 2 kg
PE = ?
Solution: PE = mgh
= (0.5m)(9.8
𝑚
𝑠2) 2kg
= (4.9
𝑚2
𝑠2 )(2kg)
= 9.8 Nm
= 9.8 J
Column B
___1. It is energy at rest
___2. It is the ability to do work
___3. It means moving
___4. It is the energy of motion
___5. An acceleration of an
object due to gravity.
a. 9.8
𝒎
𝒔 𝟐
b. Energy
c. Kinetic Energy
d. Potential Energy
e. kinetikos
Work Grade 8

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Work Grade 8

  • 1. What is work  is an abstract idea related to energy.  when work is done it is accompanied by a change in energy.  a work is done when a force applied and distance travelled by an object is the same direction. is the product of force and distance. • W = Fd where, F = Force (N) d = distance (m)
  • 2. A girl pushing a chair
  • 3. A boy pushing a wall
  • 6. Calculating Work Given: Force = 500 N distance= 7 m Work = ? Solution:
  • 8. Work is a method of transferring energy A ball and a plastic bottle
  • 9. Work is a method of transferring energy A ball and a plastic bottle Is there a work done on the ball?
  • 10. Work is a method of transferring energy A ball and a plastic bottle What can a moving ball do?
  • 11. Work is a method of transferring energy
  • 12.
  • 13. Solution: KE = 1 2 𝑚𝑣2 KE = 1 2 1000𝑘𝑔x(17𝑚/𝑠)2 KE = 1 2 1000𝑘𝑔x(289𝑚2 /𝑠2 ) KE = 1 2 289,000𝑘𝑔x(289𝑚2 /𝑠2 ) KE = 1 2 289,000𝑘𝑔 ∙ 𝑚2 /𝑠2 KE = 𝟏𝟒𝟒, 𝟓𝟎𝟎𝒌𝒈 ∙ 𝒎 𝟐 /𝒔 𝟐
  • 14. Column B ___1. If you want to increase the kinetic energy of an object, you must increase its ____and _____ ___2. It is the ability to do work ___3. It means moving ___4. It is the energy of motion ___5. Energy is the ability to do ___. a. Work b. Energy c. Kinetic Energy d. mass and acceleration e. kinetikos
  • 15.
  • 16.
  • 17.
  • 18. A Man lifting a box 0.5 m 2 kg Given: d = 0.5 m g = 9.8 𝑚 𝑠2 m = 2 kg PE = ? Solution: PE = mgh = (0.5m)(9.8 𝑚 𝑠2) 2kg = (4.9 𝑚2 𝑠2 )(2kg) = 9.8 Nm = 9.8 J
  • 19.
  • 20. Column B ___1. It is energy at rest ___2. It is the ability to do work ___3. It means moving ___4. It is the energy of motion ___5. An acceleration of an object due to gravity. a. 9.8 𝒎 𝒔 𝟐 b. Energy c. Kinetic Energy d. Potential Energy e. kinetikos