Work is defined as the product of the applied force and the distance moved in the direction of the force. Work is done when a force causes an object to move, such as a girl pushing a chair or a waiter carrying a tray. Work can be calculated using the formula: Work (W) = Force (F) x Distance (d). Work is a method of transferring energy and doing work can increase the kinetic energy of an object. Kinetic energy is the energy of motion and is calculated using the formula: Kinetic Energy = 1/2 x Mass x Velocity^2. Potential energy is the energy of an object due to its position or state, such as the energy stored when an object is raised above the ground

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

4. A waiter carrying a tray

5. Calculating Work

6. Calculating Work
Given:
Force = 500 N
distance= 7 m
Work = ?
Solution:

7. Solve the following problems:

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

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

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

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