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
Porella : features, morphology, anatomy, reproduction etc.
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)
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